diff --git a/llvm/lib/Transforms/Scalar/SROA.cpp b/llvm/lib/Transforms/Scalar/SROA.cpp
--- a/llvm/lib/Transforms/Scalar/SROA.cpp
+++ b/llvm/lib/Transforms/Scalar/SROA.cpp
@@ -119,6 +119,122 @@
 static cl::opt<bool> SROAStrictInbounds("sroa-strict-inbounds", cl::init(false),
                                         cl::Hidden);
 namespace {
+constexpr uint64_t ByteWidth = 8;
+static uint64_t bitsToBytes(uint64_t Bits) {
+  assert(Bits % 8 == 0 && "unexpected bit count");
+  return Bits / ByteWidth;
+}
+static uint64_t bytesToBits(uint64_t Bytes) {
+  assert(Bytes <= (UINT64_MAX / ByteWidth) && "too many bytes");
+  return Bytes * ByteWidth;
+}
+
+/// Find linked dbg.assign and generate a new one with the correct
+/// FragmentInfo. Link Inst to the new dbg.assign.  If Value is nullptr the
+/// value component is copied from the old dbg.assign to the new.
+/// \param OldAlloca             Alloca for the variable before splitting.
+/// \param RelativeOffsetInBytes Offset into \p OldAlloca relative to the
+///                              offset prior to splitting (change in offset).
+/// \param SliceSizeInBytes      New number of bytes being written to.
+/// \param OldInst               Instruction that is being split.
+/// \param Inst                  New instruction performing this part of the
+///                              split store.
+/// \param Dest                  Store destination.
+/// \param Value                 Stored value.
+/// \param DL                    Datalayout.
+static void migrateDebugInfo(AllocaInst *OldAlloca,
+                             uint64_t RelativeOffsetInBytes,
+                             uint64_t SliceSizeInBytes, Instruction *OldInst,
+                             Instruction *Inst, Value *Dest, Value *Value,
+                             const DataLayout &DL) {
+  auto MarkerRange = at::getAssignmentMarkers(OldInst);
+  // Nothing to do if OldInst has no linked dbg.assign intrinsics.
+  if (MarkerRange.empty())
+    return;
+
+  uint64_t RelativeOffset = bytesToBits(RelativeOffsetInBytes);
+  uint64_t SliceSize = bytesToBits(SliceSizeInBytes);
+
+  LLVM_DEBUG(dbgs() << "  migrateDebugInfo\n");
+  LLVM_DEBUG(dbgs() << "    OldAlloca: " << *OldAlloca << "\n");
+  LLVM_DEBUG(dbgs() << "    RelativeOffset: " << RelativeOffset << "\n");
+  LLVM_DEBUG(dbgs() << "    SliceSize: " << SliceSize << "\n");
+  LLVM_DEBUG(dbgs() << "    OldInst: " << *OldInst << "\n");
+  LLVM_DEBUG(dbgs() << "    Inst: " << *Inst << "\n");
+  LLVM_DEBUG(dbgs() << "    Dest: " << *Dest << "\n");
+  if (Value)
+    LLVM_DEBUG(dbgs() << "    Value: " << *Value << "\n");
+
+  // The new inst needs a DIAssignID unique metadata tag (if OldInst has
+  // one). It shouldn't already have one: assert this assumption.
+  assert(!Inst->getMetadata(LLVMContext::MD_DIAssignID));
+  DIAssignID *NewID = nullptr;
+  auto &Ctx = Inst->getContext();
+  DIBuilder DIB(*OldInst->getModule(), /*AllowUnresolved*/ false);
+  uint64_t AllocaSize = *OldAlloca->getAllocationSizeInBits(DL);
+  assert(OldAlloca->isStaticAlloca());
+
+  for (DbgAssignIntrinsic *DbgAssign : MarkerRange) {
+    LLVM_DEBUG(dbgs() << "      existing dbg.assign is: " << *DbgAssign
+                      << "\n");
+    auto *Expr = DbgAssign->getExpression();
+
+    // Check if the dbg.assign already describes a fragment.
+    auto GetCurrentFragSize = [AllocaSize, DbgAssign, Expr]() -> uint64_t {
+      if (auto FI = Expr->getFragmentInfo())
+        return FI->SizeInBits;
+      if (auto VarSize = DbgAssign->getVariable()->getSizeInBits())
+        return *VarSize;
+      // The variable type has an unspecified size. This can happen in the
+      // case of DW_TAG_unspecified_type types, e.g.  std::nullptr_t. Because
+      // there is no fragment and we do not know the size of the variable type,
+      // we'll guess by looking at the alloca.
+      return AllocaSize;
+    };
+    uint64_t CurrentFragSize = GetCurrentFragSize();
+    bool MakeNewFragment = CurrentFragSize != SliceSize;
+    assert(MakeNewFragment || RelativeOffset == 0);
+
+    assert(SliceSize <= AllocaSize);
+    if (MakeNewFragment) {
+      assert(RelativeOffset + SliceSize <= CurrentFragSize);
+      auto E = DIExpression::createFragmentExpression(Expr, RelativeOffset,
+                                                      SliceSize);
+      assert(E && "Failed to create fragment expr!");
+      Expr = *E;
+    }
+
+    // If we haven't created a DIAssignID ID do that now and attach it to Inst.
+    if (!NewID) {
+      NewID = DIAssignID::getDistinct(Ctx);
+      Inst->setMetadata(LLVMContext::MD_DIAssignID, NewID);
+    }
+
+    Value = Value ? Value : DbgAssign->getValue();
+    auto *NewAssign = DIB.insertDbgAssign(
+        Inst, Value, DbgAssign->getVariable(), Expr, Dest,
+        DIExpression::get(Ctx, std::nullopt), DbgAssign->getDebugLoc());
+
+    // We could use more precision here at the cost of some additional (code)
+    // complexity - if the original dbg.assign was adjacent to its store, we
+    // could position this new dbg.assign adjacent to its store rather than the
+    // old dbg.assgn. That would result in interleaved dbg.assigns rather than
+    // what we get now:
+    //    split store !1
+    //    split store !2
+    //    dbg.assign !1
+    //    dbg.assign !2
+    // This (current behaviour) results results in debug assignments being
+    // noted as slightly offset (in code) from the store. In practice this
+    // should have little effect on the debugging experience due to the fact
+    // that all the split stores should get the same line number.
+    NewAssign->moveBefore(DbgAssign);
+
+    NewAssign->setDebugLoc(DbgAssign->getDebugLoc());
+    LLVM_DEBUG(dbgs() << "Created new assign intrinsic: " << *NewAssign
+                      << "\n");
+  }
+}
 
 /// A custom IRBuilder inserter which prefixes all names, but only in
 /// Assert builds.
@@ -2435,6 +2551,7 @@
   // original alloca.
   uint64_t NewBeginOffset = 0, NewEndOffset = 0;
 
+  uint64_t RelativeOffset = 0;
   uint64_t SliceSize = 0;
   bool IsSplittable = false;
   bool IsSplit = false;
@@ -2508,8 +2625,14 @@
     NewBeginOffset = std::max(BeginOffset, NewAllocaBeginOffset);
     NewEndOffset = std::min(EndOffset, NewAllocaEndOffset);
 
+    RelativeOffset = NewBeginOffset - BeginOffset;
     SliceSize = NewEndOffset - NewBeginOffset;
-
+    LLVM_DEBUG(dbgs() << "   Begin:(" << BeginOffset << ", " << EndOffset
+                      << ") NewBegin:(" << NewBeginOffset << ", "
+                      << NewEndOffset << ") NewAllocaBegin:("
+                      << NewAllocaBeginOffset << ", " << NewAllocaEndOffset
+                      << ")\n");
+    assert(IsSplit || RelativeOffset == 0);
     OldUse = I->getUse();
     OldPtr = cast<Instruction>(OldUse->get());
 
@@ -2749,6 +2872,9 @@
 
   bool rewriteVectorizedStoreInst(Value *V, StoreInst &SI, Value *OldOp,
                                   AAMDNodes AATags) {
+    // Capture V for the purpose of debug-info accounting once it's converted
+    // to a vector store.
+    Value *OrigV = V;
     if (V->getType() != VecTy) {
       unsigned BeginIndex = getIndex(NewBeginOffset);
       unsigned EndIndex = getIndex(NewEndOffset);
@@ -2774,6 +2900,9 @@
       Store->setAAMetadata(AATags.shift(NewBeginOffset - BeginOffset));
     Pass.DeadInsts.push_back(&SI);
 
+    // NOTE: Careful to use OrigV rather than V.
+    migrateDebugInfo(&OldAI, RelativeOffset, SliceSize, &SI, Store,
+                     Store->getPointerOperand(), OrigV, DL);
     LLVM_DEBUG(dbgs() << "          to: " << *Store << "\n");
     return true;
   }
@@ -2796,6 +2925,10 @@
                              LLVMContext::MD_access_group});
     if (AATags)
       Store->setAAMetadata(AATags.shift(NewBeginOffset - BeginOffset));
+
+    migrateDebugInfo(&OldAI, RelativeOffset, SliceSize, &SI, Store,
+                     Store->getPointerOperand(), Store->getValueOperand(), DL);
+
     Pass.DeadInsts.push_back(&SI);
     LLVM_DEBUG(dbgs() << "          to: " << *Store << "\n");
     return true;
@@ -2871,6 +3004,10 @@
       NewSI->setAtomic(SI.getOrdering(), SI.getSyncScopeID());
     if (NewSI->isAtomic())
       NewSI->setAlignment(SI.getAlign());
+
+    migrateDebugInfo(&OldAI, RelativeOffset, SliceSize, &SI, NewSI,
+                     NewSI->getPointerOperand(), NewSI->getValueOperand(), DL);
+
     Pass.DeadInsts.push_back(&SI);
     deleteIfTriviallyDead(OldOp);
 
@@ -2926,7 +3063,11 @@
       assert(NewBeginOffset == BeginOffset);
       II.setDest(getNewAllocaSlicePtr(IRB, OldPtr->getType()));
       II.setDestAlignment(getSliceAlign());
-
+      // In theory we should call migrateDebugInfo here. However, we do not
+      // emit dbg.assign intrinsics for mem intrinsics storing through non-
+      // constant geps, or storing a variable number of bytes.
+      assert(at::getAssignmentMarkers(&II).empty() &&
+             "AT: Unexpected link to non-const GEP");
       deleteIfTriviallyDead(OldPtr);
       return false;
     }
@@ -2959,11 +3100,15 @@
     if (!CanContinue) {
       Type *SizeTy = II.getLength()->getType();
       Constant *Size = ConstantInt::get(SizeTy, NewEndOffset - NewBeginOffset);
-      CallInst *New = IRB.CreateMemSet(
+      MemIntrinsic *New = cast<MemIntrinsic>(IRB.CreateMemSet(
           getNewAllocaSlicePtr(IRB, OldPtr->getType()), II.getValue(), Size,
-          MaybeAlign(getSliceAlign()), II.isVolatile());
+          MaybeAlign(getSliceAlign()), II.isVolatile()));
       if (AATags)
         New->setAAMetadata(AATags.shift(NewBeginOffset - BeginOffset));
+
+      migrateDebugInfo(&OldAI, RelativeOffset, SliceSize, &II, New,
+                       New->getRawDest(), nullptr, DL);
+
       LLVM_DEBUG(dbgs() << "          to: " << *New << "\n");
       return false;
     }
@@ -3036,6 +3181,10 @@
                            LLVMContext::MD_access_group});
     if (AATags)
       New->setAAMetadata(AATags.shift(NewBeginOffset - BeginOffset));
+
+    migrateDebugInfo(&OldAI, RelativeOffset, SliceSize, &II, New,
+                     New->getPointerOperand(), V, DL);
+
     LLVM_DEBUG(dbgs() << "          to: " << *New << "\n");
     return !II.isVolatile();
   }
@@ -3053,7 +3202,6 @@
            (!IsDest && II.getRawSource() == OldPtr));
 
     Align SliceAlign = getSliceAlign();
-
     // For unsplit intrinsics, we simply modify the source and destination
     // pointers in place. This isn't just an optimization, it is a matter of
     // correctness. With unsplit intrinsics we may be dealing with transfers
@@ -3064,10 +3212,16 @@
     if (!IsSplittable) {
       Value *AdjustedPtr = getNewAllocaSlicePtr(IRB, OldPtr->getType());
       if (IsDest) {
+        // Update the address component of linked dbg.assigns.
+        for (auto *DAI : at::getAssignmentMarkers(&II)) {
+          if (any_of(DAI->location_ops(),
+                     [&](Value *V) { return V == II.getDest(); }) ||
+              DAI->getAddress() == II.getDest())
+            DAI->replaceVariableLocationOp(II.getDest(), AdjustedPtr);
+        }
         II.setDest(AdjustedPtr);
         II.setDestAlignment(SliceAlign);
-      }
-      else {
+      } else {
         II.setSource(AdjustedPtr);
         II.setSourceAlignment(SliceAlign);
       }
@@ -3156,6 +3310,9 @@
                                        Size, II.isVolatile());
       if (AATags)
         New->setAAMetadata(AATags.shift(NewBeginOffset - BeginOffset));
+
+      migrateDebugInfo(&OldAI, RelativeOffset, SliceSize, &II, New, DestPtr,
+                       nullptr, DL);
       LLVM_DEBUG(dbgs() << "          to: " << *New << "\n");
       return false;
     }
@@ -3242,6 +3399,9 @@
                              LLVMContext::MD_access_group});
     if (AATags)
       Store->setAAMetadata(AATags.shift(NewBeginOffset - BeginOffset));
+
+    migrateDebugInfo(&OldAI, RelativeOffset, SliceSize, &II, Store, DstPtr, Src,
+                     DL);
     LLVM_DEBUG(dbgs() << "          to: " << *Store << "\n");
     return !II.isVolatile();
   }
@@ -3579,12 +3739,13 @@
 
   struct StoreOpSplitter : public OpSplitter<StoreOpSplitter> {
     StoreOpSplitter(Instruction *InsertionPoint, Value *Ptr, Type *BaseTy,
-                    AAMDNodes AATags, Align BaseAlign, const DataLayout &DL,
-                    IRBuilderTy &IRB)
+                    AAMDNodes AATags, StoreInst *AggStore, Align BaseAlign,
+                    const DataLayout &DL, IRBuilderTy &IRB)
         : OpSplitter<StoreOpSplitter>(InsertionPoint, Ptr, BaseTy, BaseAlign,
                                       DL, IRB),
-          AATags(AATags) {}
+          AATags(AATags), AggStore(AggStore) {}
     AAMDNodes AATags;
+    StoreInst *AggStore;
     /// Emit a leaf store of a single value. This is called at the leaves of the
     /// recursive emission to actually produce stores.
     void emitFunc(Type *Ty, Value *&Agg, Align Alignment, const Twine &Name) {
@@ -3606,6 +3767,25 @@
           GEPOperator::accumulateConstantOffset(BaseTy, GEPIndices, DL, Offset))
         Store->setAAMetadata(AATags.shift(Offset.getZExtValue()));
 
+      // migrateDebugInfo requires the base Alloca. Walk to it from this gep.
+      // If we cannot (because there's an intervening non-const or unbounded
+      // gep) then we wouldn't expect to see dbg.assign intrinsics linked to
+      // this instruction.
+      APInt OffsetInBytes(DL.getTypeSizeInBits(Ptr->getType()), false);
+      Value *Base = InBoundsGEP->stripAndAccumulateInBoundsConstantOffsets(
+          DL, OffsetInBytes);
+      if (auto *OldAI = dyn_cast<AllocaInst>(Base)) {
+        uint64_t SizeInBits =
+            DL.getTypeSizeInBits(Store->getValueOperand()->getType());
+        migrateDebugInfo(OldAI, OffsetInBytes.getZExtValue(),
+                         bitsToBytes(SizeInBits), AggStore, Store,
+                         Store->getPointerOperand(), Store->getValueOperand(),
+                         DL);
+      } else {
+        assert(at::getAssignmentMarkers(Store).empty() &&
+               "AT: unexpected debug.assign linked to store through "
+               "unbounded GEP");
+      }
       LLVM_DEBUG(dbgs() << "          to: " << *Store << "\n");
     }
   };
@@ -3619,7 +3799,7 @@
 
     // We have an aggregate being stored, split it apart.
     LLVM_DEBUG(dbgs() << "    original: " << SI << "\n");
-    StoreOpSplitter Splitter(&SI, *U, V->getType(), SI.getAAMetadata(),
+    StoreOpSplitter Splitter(&SI, *U, V->getType(), SI.getAAMetadata(), &SI,
                              getAdjustedAlignment(&SI, 0), DL, IRB);
     Splitter.emitSplitOps(V->getType(), V, V->getName() + ".fca");
     Visited.erase(&SI);
@@ -4220,7 +4400,8 @@
             getAdjustedAlignment(SI, PartOffset),
             /*IsVolatile*/ false);
         PStore->copyMetadata(*SI, {LLVMContext::MD_mem_parallel_loop_access,
-                                   LLVMContext::MD_access_group});
+                                   LLVMContext::MD_access_group,
+                                   LLVMContext::MD_DIAssignID});
         LLVM_DEBUG(dbgs() << "      +" << PartOffset << ":" << *PStore << "\n");
       }
 
@@ -4693,6 +4874,8 @@
   // Migrate debug information from the old alloca to the new alloca(s)
   // and the individual partitions.
   TinyPtrVector<DbgVariableIntrinsic *> DbgDeclares = FindDbgAddrUses(&AI);
+  for (auto *DbgAssign : at::getAssignmentMarkers(&AI))
+    DbgDeclares.push_back(DbgAssign);
   for (DbgVariableIntrinsic *DbgDeclare : DbgDeclares) {
     auto *Expr = DbgDeclare->getExpression();
     DIBuilder DIB(*AI.getModule(), /*AllowUnresolved*/ false);
@@ -4712,9 +4895,10 @@
         if (ExprFragment) {
           uint64_t AbsEnd =
               ExprFragment->OffsetInBits + ExprFragment->SizeInBits;
-          if (Start >= AbsEnd)
+          if (Start >= AbsEnd) {
             // No need to describe a SROAed padding.
             continue;
+          }
           Size = std::min(Size, AbsEnd - Start);
         }
         // The new, smaller fragment is stenciled out from the old fragment.
@@ -4756,8 +4940,23 @@
           OldDII->eraseFromParent();
       }
 
-      DIB.insertDeclare(Fragment.Alloca, DbgDeclare->getVariable(), FragmentExpr,
-                        DbgDeclare->getDebugLoc(), &AI);
+      if (auto *DbgAssign = dyn_cast<DbgAssignIntrinsic>(DbgDeclare)) {
+        if (!Fragment.Alloca->hasMetadata(LLVMContext::MD_DIAssignID)) {
+          Fragment.Alloca->setMetadata(
+              LLVMContext::MD_DIAssignID,
+              DIAssignID::getDistinct(AI.getContext()));
+        }
+        auto *NewAssign = DIB.insertDbgAssign(
+            Fragment.Alloca, DbgAssign->getValue(), DbgAssign->getVariable(),
+            FragmentExpr, Fragment.Alloca, DbgAssign->getAddressExpression(),
+            DbgAssign->getDebugLoc());
+        NewAssign->setDebugLoc(DbgAssign->getDebugLoc());
+        LLVM_DEBUG(dbgs() << "Created new assign intrinsic: " << *NewAssign
+                          << "\n");
+      } else {
+        DIB.insertDeclare(Fragment.Alloca, DbgDeclare->getVariable(),
+                          FragmentExpr, DbgDeclare->getDebugLoc(), &AI);
+      }
     }
   }
   return Changed;
@@ -4883,6 +5082,7 @@
         OldDII->eraseFromParent();
     }
 
+    at::deleteAssignmentMarkers(I);
     I->replaceAllUsesWith(UndefValue::get(I->getType()));
 
     for (Use &Operand : I->operands())
diff --git a/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/after-inlining.ll b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/after-inlining.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/after-inlining.ll
@@ -0,0 +1,144 @@
+; RUN: opt %s -S -passes=sroa -o - -experimental-assignment-tracking | FileCheck %s
+
+;; Check that SROA preserves the InlinedAt status of new dbg.assign intriniscs
+;; it inserts.
+
+;; $cat test.c
+;; typedef struct {
+;;   int a;
+;;   int b[];
+;; } c;
+;; int d, e, f;
+;; void g(c *h) {
+;;   if (d)
+;;     h->a = 1;
+;; }
+;; void i(c *h) {
+;;   long j = f = 0;
+;;   for (; f < h->a; f++)
+;;     j += h->b[f];
+;;   e = j;
+;; }
+;; void k() {
+;;   c j;
+;;   g(&j);
+;;   i(&j);
+;; }
+;; void l() { k(); }
+;;
+;; $ clang test.c -Xclang -fexperimental-assignment-tracking  -O2 -g
+
+; CHECK: call void @llvm.dbg.assign(metadata i1 undef, metadata !{{.+}}, metadata !DIExpression(), metadata !{{.+}}, metadata ptr undef, metadata !DIExpression()), !dbg ![[DBG:[0-9]+]]
+
+; CHECK-DAG: ![[DBG]] = !DILocation(line: 0, scope: ![[INL_SC:[0-9]+]], inlinedAt: ![[IA:[0-9]+]])
+; CHECK-DAG: ![[IA]] = distinct !DILocation(line: 21, column: 12, scope: ![[SC:[0-9]+]])
+; CHECK-DAG: ![[SC]] = distinct !DISubprogram(name: "l",
+; CHECK-DAG: ![[INL_SC]] = distinct !DISubprogram(name: "k"
+
+%struct.c = type { i32, [0 x i32] }
+
+@f = dso_local local_unnamed_addr global i32 0, align 4, !dbg !9
+@e = dso_local local_unnamed_addr global i32 0, align 4, !dbg !6
+
+declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #1
+declare void @llvm.lifetime.start.p0i8(i64 immarg, ptr nocapture) #2
+declare void @llvm.lifetime.end.p0i8(i64 immarg, ptr nocapture) #2
+
+define dso_local void @l() local_unnamed_addr #4 !dbg !73 {
+entry:
+  %j.i = alloca %struct.c, align 4, !DIAssignID !74
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !64, metadata !DIExpression(), metadata !74, metadata ptr %j.i, metadata !DIExpression()) #5, !dbg !75
+  %0 = bitcast ptr %j.i to ptr, !dbg !77
+  call void @llvm.lifetime.start.p0i8(i64 4, ptr nonnull %0) #5, !dbg !77
+  %arrayidx.i.i = getelementptr inbounds %struct.c, ptr %j.i, i64 0, i32 1, i64 0, !dbg !78
+  %1 = load i32, ptr %arrayidx.i.i, align 4, !dbg !78
+  store i32 1, ptr @f, align 4, !dbg !80
+  store i32 %1, ptr @e, align 4, !dbg !81
+  call void @llvm.lifetime.end.p0i8(i64 4, ptr nonnull %0) #5, !dbg !82
+  ret void, !dbg !83
+}
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!11, !12, !13}
+!llvm.ident = !{!14}
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "d", scope: !2, file: !3, line: 5, type: !8, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
+!3 = !DIFile(filename: "test.c", directory: "/")
+!4 = !{}
+!5 = !{!0, !6, !9}
+!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
+!7 = distinct !DIGlobalVariable(name: "e", scope: !2, file: !3, line: 5, type: !8, isLocal: false, isDefinition: true)
+!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!9 = !DIGlobalVariableExpression(var: !10, expr: !DIExpression())
+!10 = distinct !DIGlobalVariable(name: "f", scope: !2, file: !3, line: 5, type: !8, isLocal: false, isDefinition: true)
+!11 = !{i32 7, !"Dwarf Version", i32 4}
+!12 = !{i32 2, !"Debug Info Version", i32 3}
+!13 = !{i32 1, !"wchar_size", i32 4}
+!14 = !{!"clang version 12.0.0)"}
+!15 = distinct !DISubprogram(name: "g", scope: !3, file: !3, line: 6, type: !16, scopeLine: 6, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !27)
+!16 = !DISubroutineType(types: !17)
+!17 = !{null, !18}
+!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64)
+!19 = !DIDerivedType(tag: DW_TAG_typedef, name: "c", file: !3, line: 4, baseType: !20)
+!20 = distinct !DICompositeType(tag: DW_TAG_structure_type, file: !3, line: 1, size: 32, elements: !21)
+!21 = !{!22, !23}
+!22 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !20, file: !3, line: 2, baseType: !8, size: 32)
+!23 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !20, file: !3, line: 3, baseType: !24, offset: 32)
+!24 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, elements: !25)
+!25 = !{!26}
+!26 = !DISubrange(count: -1)
+!27 = !{!28}
+!28 = !DILocalVariable(name: "h", arg: 1, scope: !15, file: !3, line: 6, type: !18)
+!29 = !DILocation(line: 7, column: 7, scope: !30)
+!30 = distinct !DILexicalBlock(scope: !15, file: !3, line: 7, column: 7)
+!35 = !DILocation(line: 7, column: 7, scope: !15)
+!36 = !DILocation(line: 8, column: 8, scope: !30)
+!37 = !DILocation(line: 8, column: 10, scope: !30)
+!38 = !DILocation(line: 8, column: 5, scope: !30)
+!39 = !DILocation(line: 9, column: 1, scope: !15)
+!40 = distinct !DISubprogram(name: "i", scope: !3, file: !3, line: 10, type: !16, scopeLine: 10, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !41)
+!41 = !{!42, !43}
+!42 = !DILocalVariable(name: "h", arg: 1, scope: !40, file: !3, line: 10, type: !18)
+!43 = !DILocalVariable(name: "j", scope: !40, file: !3, line: 11, type: !44)
+!44 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
+!45 = !DILocation(line: 0, scope: !40)
+!46 = !DILocation(line: 12, column: 17, scope: !47)
+!47 = distinct !DILexicalBlock(scope: !48, file: !3, line: 12, column: 3)
+!48 = distinct !DILexicalBlock(scope: !40, file: !3, line: 12, column: 3)
+!49 = !DILocation(line: 12, column: 12, scope: !47)
+!50 = !DILocation(line: 12, column: 3, scope: !48)
+!51 = !DILocation(line: 13, column: 10, scope: !47)
+!52 = !DILocation(line: 13, column: 7, scope: !47)
+!53 = !DILocation(line: 12, column: 21, scope: !47)
+!54 = distinct !{!54, !50, !55, !56}
+!55 = !DILocation(line: 13, column: 16, scope: !48)
+!56 = !{!"llvm.loop.mustprogress"}
+!57 = !DILocation(line: 14, column: 7, scope: !40)
+!58 = !DILocation(line: 14, column: 5, scope: !40)
+!59 = !DILocation(line: 15, column: 1, scope: !40)
+!60 = distinct !DISubprogram(name: "k", scope: !3, file: !3, line: 16, type: !61, scopeLine: 16, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !63)
+!61 = !DISubroutineType(types: !62)
+!62 = !{null}
+!63 = !{!64}
+!64 = !DILocalVariable(name: "j", scope: !60, file: !3, line: 17, type: !19)
+!65 = distinct !DIAssignID()
+!66 = !DILocation(line: 0, scope: !60)
+!67 = !DILocation(line: 17, column: 3, scope: !60)
+!68 = !DILocation(line: 13, column: 10, scope: !47, inlinedAt: !69)
+!69 = distinct !DILocation(line: 19, column: 3, scope: !60)
+!70 = !DILocation(line: 0, scope: !40, inlinedAt: !69)
+!71 = !DILocation(line: 14, column: 5, scope: !40, inlinedAt: !69)
+!72 = !DILocation(line: 20, column: 1, scope: !60)
+!73 = distinct !DISubprogram(name: "l", scope: !3, file: !3, line: 21, type: !61, scopeLine: 21, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !4)
+!74 = distinct !DIAssignID()
+!75 = !DILocation(line: 0, scope: !60, inlinedAt: !76)
+!76 = distinct !DILocation(line: 21, column: 12, scope: !73)
+!77 = !DILocation(line: 17, column: 3, scope: !60, inlinedAt: !76)
+!78 = !DILocation(line: 13, column: 10, scope: !47, inlinedAt: !79)
+!79 = distinct !DILocation(line: 19, column: 3, scope: !60, inlinedAt: !76)
+!80 = !DILocation(line: 0, scope: !40, inlinedAt: !79)
+!81 = !DILocation(line: 14, column: 5, scope: !40, inlinedAt: !79)
+!82 = !DILocation(line: 20, column: 1, scope: !60, inlinedAt: !76)
+!83 = !DILocation(line: 21, column: 17, scope: !73)
diff --git a/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/alloca-single-slice.ll b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/alloca-single-slice.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/alloca-single-slice.ll
@@ -0,0 +1,82 @@
+; RUN: opt -passes=sroa,verify -S %s -o - -experimental-assignment-tracking \
+; RUN: | FileCheck %s --implicit-check-not="call void @llvm.dbg"
+
+; Check that single sliced allocas retain their assignment tracking debug info.
+
+;; $ cat test.c
+;; struct a {
+;;   char b[8];
+;; };
+;; int c;
+;; void d() {
+;;   struct a a;
+;;   memcpy(a.b, 0, c);
+;; }
+;; $ clang test.c -Xclang -disable-llvm-passes -O2 -g -c -S -emit-llvm -o - \
+;;   | opt -passes=declare-to-assign -S -o -
+
+; CHECK: entry:
+; CHECK-NEXT: %a.sroa.0 = alloca i64, align 8, !DIAssignID ![[ID_1:[0-9]+]]
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i1 undef, metadata ![[VAR:[0-9]+]], metadata !DIExpression(), metadata ![[ID_1]], metadata ptr %a.sroa.0, metadata !DIExpression()), !dbg
+
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+
+%struct.a = type { [8 x i8] }
+
+@c = dso_local global i32 0, align 4, !dbg !0
+
+define dso_local void @d() !dbg !11 {
+entry:
+  %a = alloca %struct.a, align 1, !DIAssignID !23
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !15, metadata !DIExpression(), metadata !23, metadata ptr %a, metadata !DIExpression()), !dbg !24
+  %0 = bitcast ptr %a to ptr, !dbg !25
+  call void @llvm.lifetime.start.p0i8(i64 8, ptr %0), !dbg !25
+  %b = getelementptr inbounds %struct.a, ptr %a, i32 0, i32 0, !dbg !26
+  %arraydecay = getelementptr inbounds [8 x i8], ptr %b, i64 0, i64 0, !dbg !27
+  %1 = load i32, ptr @c, align 4, !dbg !28
+  %conv = sext i32 %1 to i64, !dbg !28
+  call void @llvm.memcpy.p0i8.p0i8.i64(ptr align 1 %arraydecay, ptr align 1 null, i64 %conv, i1 false), !dbg !27
+  %2 = bitcast ptr %a to ptr, !dbg !33
+  call void @llvm.lifetime.end.p0i8(i64 8, ptr %2), !dbg !33
+  ret void, !dbg !33
+}
+
+declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture)
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg)
+declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture)
+declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata)
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!7, !8, !9}
+!llvm.ident = !{!10}
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "c", scope: !2, file: !3, line: 4, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
+!3 = !DIFile(filename: "test.c", directory: "/")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!7 = !{i32 7, !"Dwarf Version", i32 4}
+!8 = !{i32 2, !"Debug Info Version", i32 3}
+!9 = !{i32 1, !"wchar_size", i32 4}
+!10 = !{!"clang version 12.0.0"}
+!11 = distinct !DISubprogram(name: "d", scope: !3, file: !3, line: 5, type: !12, scopeLine: 5, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !14)
+!12 = !DISubroutineType(types: !13)
+!13 = !{null}
+!14 = !{!15}
+!15 = !DILocalVariable(name: "a", scope: !11, file: !3, line: 6, type: !16)
+!16 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "a", file: !3, line: 1, size: 64, elements: !17)
+!17 = !{!18}
+!18 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !16, file: !3, line: 2, baseType: !19, size: 64)
+!19 = !DICompositeType(tag: DW_TAG_array_type, baseType: !20, size: 64, elements: !21)
+!20 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
+!21 = !{!22}
+!22 = !DISubrange(count: 8)
+!23 = distinct !DIAssignID()
+!24 = !DILocation(line: 0, scope: !11)
+!25 = !DILocation(line: 6, column: 3, scope: !11)
+!26 = !DILocation(line: 7, column: 12, scope: !11)
+!27 = !DILocation(line: 7, column: 3, scope: !11)
+!28 = !DILocation(line: 7, column: 18, scope: !11)
+!33 = !DILocation(line: 8, column: 1, scope: !11)
diff --git a/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/complex.ll b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/complex.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/complex.ll
@@ -0,0 +1,69 @@
+; RUN: opt -passes=sroa -S -o - %s -experimental-assignment-tracking | FileCheck %s
+;
+;; Based on llvm/test/DebugInfo/ARM/sroa-complex.ll
+;; generated from:
+;; $ cat test.c
+;; void f(_Complex double c) { c = 0; }
+;; $ clang test.c -g -O2 -c -Xclang -disable-llvm-passes -S \
+;;     -emit-llvm -o - --target="thumbv7-apple-unknown"
+;;
+;; Commented out some parts of the function that are not relevant to the test.
+;;
+;; Check that a split store gets dbg.assigns fragments. Ensure that only the
+;; value-expression gets fragment info; that the address-expression remains
+;; untouched.
+
+;; dbg.assigns for the split (then promoted) stores.
+; CHECK: %c.coerce.fca.0.extract = extractvalue [2 x i64] %c.coerce, 0
+; CHECK: %c.coerce.fca.1.extract = extractvalue [2 x i64] %c.coerce, 1
+; CHECK: call void @llvm.dbg.assign(metadata i64 %c.coerce.fca.0.extract,{{.+}}, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64),{{.+}}, metadata ptr undef, metadata !DIExpression())
+; CHECK: call void @llvm.dbg.assign(metadata i64 %c.coerce.fca.1.extract,{{.+}}, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64),{{.+}}, metadata ptr undef, {{.+}})
+
+target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
+target triple = "armv7-apple-unknown"
+
+define dso_local arm_aapcscc void @f([2 x i64] %c.coerce) #0 !dbg !8 {
+entry:
+  %c = alloca { double, double }, align 8, !DIAssignID !14
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !13, metadata !DIExpression(), metadata !14, metadata ptr %c, metadata !DIExpression()), !dbg !15
+  %0 = bitcast ptr %c to [2 x i64]*
+  store [2 x i64] %c.coerce, [2 x i64]* %0, align 8, !DIAssignID !16
+  call void @llvm.dbg.assign(metadata [2 x i64] %c.coerce, metadata !13, metadata !DIExpression(), metadata !16, metadata [2 x i64]* %0, metadata !DIExpression()), !dbg !15
+  ; --- The rest of this function isn't useful for the test ---
+  ;%c.realp = getelementptr inbounds { double, double }, ptr %c, i32 0, i32 0, !dbg !17
+  ;%c.imagp = getelementptr inbounds { double, double }, ptr %c, i32 0, i32 1, !dbg !17
+  ;store double 0.000000e+00, ptr %c.realp, align 8, !dbg !17, !DIAssignID !18
+  ;call void @llvm.dbg.assign(metadata double 0.000000e+00, metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64), metadata !18, metadata ptr %c.realp, metadata !DIExpression()), !dbg !15
+  ;store double 0.000000e+00, ptr %c.imagp, align 8, !dbg !17, !DIAssignID !19
+  ;call void @llvm.dbg.assign(metadata double 0.000000e+00, metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64), metadata !19, metadata ptr %c.imagp, metadata !DIExpression()), !dbg !15
+  ret void, !dbg !20
+}
+
+declare void @llvm.dbg.declare(metadata, metadata, metadata)
+declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata)
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5, !6}
+!llvm.ident = !{!7}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
+!1 = !DIFile(filename: "test.c", directory: "/")
+!2 = !{}
+!3 = !{i32 7, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{i32 1, !"min_enum_size", i32 4}
+!7 = !{!"clang version 12.0.0"}
+!8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 2, type: !9, scopeLine: 2, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12)
+!9 = !DISubroutineType(types: !10)
+!10 = !{null, !11}
+!11 = !DIBasicType(name: "complex", size: 128, encoding: DW_ATE_complex_float)
+!12 = !{!13}
+!13 = !DILocalVariable(name: "c", arg: 1, scope: !8, file: !1, line: 2, type: !11)
+!14 = distinct !DIAssignID()
+!15 = !DILocation(line: 0, scope: !8)
+!16 = distinct !DIAssignID()
+!17 = !DILocation(line: 2, column: 31, scope: !8)
+!18 = distinct !DIAssignID()
+!19 = distinct !DIAssignID()
+!20 = !DILocation(line: 2, column: 36, scope: !8)
diff --git a/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/frag-2.ll b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/frag-2.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/frag-2.ll
@@ -0,0 +1,260 @@
+; RUN: opt -passes=sroa -S %s -o - -experimental-assignment-tracking | FileCheck %s
+
+;; $ cat test.cpp
+;; class a {
+;; public:
+;;   float b[4];
+;;   void c();
+;; };
+;; class B {
+;; public:
+;;   B(a d) : e(d) {}
+;;   a &f() { return e; }
+;;   B operator*(const B &)const;
+;;   int g;
+;;   a e;
+;; };
+;; B B::operator*(const B &)const { return e; }
+;; class h {
+;; public:
+;;   B i();
+;; };
+;; void j() {
+;;   h convexbody, k;
+;;   B l = k.i(), m = convexbody.i(), n = l * m;
+;;   a o = n.f(); // Looking at this store, o[0, 128] <- n[32, 160].
+;;   o.c();
+;; }
+;; Generated by grabbing IR before sroa in:
+;; $ clang++ -O2 -g -c test.cpp -Xclang -fexperimental-assignment-tracking
+
+;; Check that the store 4xfloat split into 2x store 2xfloat has correct debug
+;; info when the source (n, 160 bits of int+5*float) is split beforehand (see
+;; comment in test.cpp above). Ensure that only the value-expression gets
+;; fragment info; that the address-expression remains untouched.
+
+;; Check nearby instructions to make sure we're looking in the right place.
+; CHECK: define dso_local void @_Z1jv()
+; CHECK: call void @_ZN1h1iEv(ptr nonnull sret(%class.B) align 4 %m,
+
+; CHECK: store <2 x float> %agg.tmp.sroa.0.0.copyload.i, ptr %4, align 4,{{.+}}!DIAssignID ![[id1:[0-9]+]]
+; CHECK: store <2 x float> %agg.tmp.sroa.2.0.copyload.i, ptr %n.sroa.4.4..sroa_idx, align 4,{{.+}}!DIAssignID ![[id2:[0-9]+]]
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata <2 x float> %agg.tmp.sroa.0.0.copyload.i, metadata ![[var:[0-9]+]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64), metadata ![[id1]], metadata ptr %4, metadata !DIExpression()), !dbg
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata <2 x float> %agg.tmp.sroa.2.0.copyload.i, metadata ![[var]], metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64), metadata ![[id2]], metadata ptr %n.sroa.4.4..sroa_idx, metadata !DIExpression()), !dbg
+
+; CHECK: ret
+
+%class.B = type { i32, %class.a }
+%class.a = type { [4 x float] }
+%class.h = type { i8 }
+
+$_ZN1BC2E1a = comdat any
+
+$_ZN1B1fEv = comdat any
+
+; Function Attrs: nofree norecurse nounwind uwtable
+define dso_local void @_ZNK1BmlERKS_(ptr noalias nocapture sret(%class.B) align 4 %agg.result, ptr nocapture readonly %this, ptr nocapture nonnull readnone align 4 dereferenceable(20) %0) local_unnamed_addr #0 align 2 !dbg !7 {
+entry:
+  %agg.tmp.sroa.0.0..sroa_idx = getelementptr inbounds %class.B, ptr %this, i64 0, i32 1, !dbg !42
+  %agg.tmp.sroa.0.0..sroa_cast = bitcast ptr %agg.tmp.sroa.0.0..sroa_idx to ptr, !dbg !42
+  %agg.tmp.sroa.0.0.copyload = load <2 x float>, ptr %agg.tmp.sroa.0.0..sroa_cast, align 4, !dbg !42
+  %agg.tmp.sroa.2.0..sroa_idx2 = getelementptr inbounds %class.B, ptr %this, i64 0, i32 1, i32 0, i64 2, !dbg !42
+  %agg.tmp.sroa.2.0..sroa_cast = bitcast ptr %agg.tmp.sroa.2.0..sroa_idx2 to ptr, !dbg !42
+  %agg.tmp.sroa.2.0.copyload = load <2 x float>, ptr %agg.tmp.sroa.2.0..sroa_cast, align 4, !dbg !42
+  %d.sroa.0.0..sroa_idx.i = getelementptr inbounds %class.B, ptr %agg.result, i64 0, i32 1, !dbg !47
+  %d.sroa.0.0..sroa_cast.i = bitcast ptr %d.sroa.0.0..sroa_idx.i to ptr, !dbg !47
+  store <2 x float> %agg.tmp.sroa.0.0.copyload, ptr %d.sroa.0.0..sroa_cast.i, align 4, !dbg !47
+  %d.sroa.2.0..sroa_idx2.i = getelementptr inbounds %class.B, ptr %agg.result, i64 0, i32 1, i32 0, i64 2, !dbg !47
+  %d.sroa.2.0..sroa_cast.i = bitcast ptr %d.sroa.2.0..sroa_idx2.i to ptr, !dbg !47
+  store <2 x float> %agg.tmp.sroa.2.0.copyload, ptr %d.sroa.2.0..sroa_cast.i, align 4, !dbg !47
+  ret void, !dbg !54
+}
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.memcpy.p0i8.p0i8.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #1
+
+; Function Attrs: nounwind uwtable
+define linkonce_odr dso_local void @_ZN1BC2E1a(ptr %this, <2 x float> %d.coerce0, <2 x float> %d.coerce1) unnamed_addr #2 comdat align 2 !dbg !48 {
+entry:
+  %d.sroa.0.0..sroa_idx = getelementptr inbounds %class.B, ptr %this, i64 0, i32 1, !dbg !55
+  %d.sroa.0.0..sroa_cast = bitcast ptr %d.sroa.0.0..sroa_idx to ptr, !dbg !55
+  store <2 x float> %d.coerce0, ptr %d.sroa.0.0..sroa_cast, align 4, !dbg !55
+  %d.sroa.2.0..sroa_idx2 = getelementptr inbounds %class.B, ptr %this, i64 0, i32 1, i32 0, i64 2, !dbg !55
+  %d.sroa.2.0..sroa_cast = bitcast ptr %d.sroa.2.0..sroa_idx2 to ptr, !dbg !55
+  store <2 x float> %d.coerce1, ptr %d.sroa.2.0..sroa_cast, align 4, !dbg !55
+  ret void, !dbg !56
+}
+
+; Function Attrs: nofree nosync nounwind readnone speculatable willreturn
+declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #3
+
+; Function Attrs: uwtable
+define dso_local void @_Z1jv() local_unnamed_addr #4 !dbg !57 {
+entry:
+  %convexbody = alloca %class.h, align 1, !DIAssignID !73
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !61, metadata !DIExpression(), metadata !73, metadata ptr %convexbody, metadata !DIExpression()), !dbg !74
+  %k = alloca %class.h, align 1, !DIAssignID !75
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !68, metadata !DIExpression(), metadata !75, metadata ptr %k, metadata !DIExpression()), !dbg !74
+  %l = alloca %class.B, align 4, !DIAssignID !76
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !69, metadata !DIExpression(), metadata !76, metadata ptr %l, metadata !DIExpression()), !dbg !74
+  %m = alloca %class.B, align 4, !DIAssignID !77
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !70, metadata !DIExpression(), metadata !77, metadata ptr %m, metadata !DIExpression()), !dbg !74
+  %n = alloca %class.B, align 4, !DIAssignID !78
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !71, metadata !DIExpression(), metadata !78, metadata ptr %n, metadata !DIExpression()), !dbg !74
+  %o = alloca %class.a, align 4, !DIAssignID !79
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !72, metadata !DIExpression(), metadata !79, metadata ptr %o, metadata !DIExpression()), !dbg !74
+  %0 = getelementptr inbounds %class.h, ptr %convexbody, i64 0, i32 0, !dbg !80
+  call void @llvm.lifetime.start.p0i8(i64 1, ptr nonnull %0) #7, !dbg !80
+  %1 = getelementptr inbounds %class.h, ptr %k, i64 0, i32 0, !dbg !80
+  call void @llvm.lifetime.start.p0i8(i64 1, ptr nonnull %1) #7, !dbg !80
+  %2 = bitcast ptr %l to ptr, !dbg !81
+  call void @llvm.lifetime.start.p0i8(i64 20, ptr nonnull %2) #7, !dbg !81
+  call void @_ZN1h1iEv(ptr nonnull sret(%class.B) align 4 %l, ptr nonnull %k), !dbg !82
+  %3 = bitcast ptr %m to ptr, !dbg !81
+  call void @llvm.lifetime.start.p0i8(i64 20, ptr nonnull %3) #7, !dbg !81
+  call void @_ZN1h1iEv(ptr nonnull sret(%class.B) align 4 %m, ptr nonnull %convexbody), !dbg !83
+  %4 = bitcast ptr %n to ptr, !dbg !81
+  call void @llvm.lifetime.start.p0i8(i64 20, ptr nonnull %4) #7, !dbg !81
+  %agg.tmp.sroa.0.0..sroa_idx.i = getelementptr inbounds %class.B, ptr %l, i64 0, i32 1, !dbg !84
+  %agg.tmp.sroa.0.0..sroa_cast.i = bitcast ptr %agg.tmp.sroa.0.0..sroa_idx.i to ptr, !dbg !84
+  %agg.tmp.sroa.0.0.copyload.i = load <2 x float>, ptr %agg.tmp.sroa.0.0..sroa_cast.i, align 4, !dbg !84
+  %agg.tmp.sroa.2.0..sroa_idx2.i = getelementptr inbounds %class.B, ptr %l, i64 0, i32 1, i32 0, i64 2, !dbg !84
+  %agg.tmp.sroa.2.0..sroa_cast.i = bitcast ptr %agg.tmp.sroa.2.0..sroa_idx2.i to ptr, !dbg !84
+  %agg.tmp.sroa.2.0.copyload.i = load <2 x float>, ptr %agg.tmp.sroa.2.0..sroa_cast.i, align 4, !dbg !84
+  %d.sroa.0.0..sroa_idx.i.i = getelementptr inbounds %class.B, ptr %n, i64 0, i32 1, !dbg !89
+  %d.sroa.0.0..sroa_cast.i.i = bitcast ptr %d.sroa.0.0..sroa_idx.i.i to ptr, !dbg !89
+  store <2 x float> %agg.tmp.sroa.0.0.copyload.i, ptr %d.sroa.0.0..sroa_cast.i.i, align 4, !dbg !89
+  %d.sroa.2.0..sroa_idx2.i.i = getelementptr inbounds %class.B, ptr %n, i64 0, i32 1, i32 0, i64 2, !dbg !89
+  %d.sroa.2.0..sroa_cast.i.i = bitcast ptr %d.sroa.2.0..sroa_idx2.i.i to ptr, !dbg !89
+  store <2 x float> %agg.tmp.sroa.2.0.copyload.i, ptr %d.sroa.2.0..sroa_cast.i.i, align 4, !dbg !89
+  %5 = bitcast ptr %o to ptr, !dbg !91
+  call void @llvm.lifetime.start.p0i8(i64 16, ptr nonnull %5) #7, !dbg !91
+  %e.i = getelementptr inbounds %class.B, ptr %n, i64 0, i32 1, !dbg !92
+  %6 = bitcast ptr %e.i to ptr, !dbg !97
+  call void @llvm.memcpy.p0i8.p0i8.i64(ptr nonnull align 4 dereferenceable(16) %5, ptr nonnull align 4 dereferenceable(16) %6, i64 16, i1 false), !dbg !97, !DIAssignID !98
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !72, metadata !DIExpression(), metadata !98, metadata ptr %5, metadata !DIExpression()), !dbg !74
+  call void @_ZN1a1cEv(ptr nonnull %o), !dbg !99
+  call void @llvm.lifetime.end.p0i8(i64 16, ptr nonnull %5) #7, !dbg !100
+  call void @llvm.lifetime.end.p0i8(i64 20, ptr nonnull %4) #7, !dbg !100
+  call void @llvm.lifetime.end.p0i8(i64 20, ptr nonnull %3) #7, !dbg !100
+  call void @llvm.lifetime.end.p0i8(i64 20, ptr nonnull %2) #7, !dbg !100
+  call void @llvm.lifetime.end.p0i8(i64 1, ptr nonnull %1) #7, !dbg !100
+  call void @llvm.lifetime.end.p0i8(i64 1, ptr nonnull %0) #7, !dbg !100
+  ret void, !dbg !100
+}
+
+declare void @llvm.lifetime.start.p0i8(i64 immarg, ptr nocapture) #1
+declare dso_local void @_ZN1h1iEv(ptr sret(%class.B) align 4, ptr) local_unnamed_addr #5
+
+; Function Attrs: nounwind uwtable
+define linkonce_odr dso_local nonnull align 4 dereferenceable(16) ptr @_ZN1B1fEv(ptr %this) local_unnamed_addr #6 comdat align 2 !dbg !93 {
+entry:
+  %e = getelementptr inbounds %class.B, ptr %this, i64 0, i32 1, !dbg !101
+  ret ptr %e, !dbg !102
+}
+
+declare dso_local void @_ZN1a1cEv(ptr) local_unnamed_addr #5
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.lifetime.end.p0i8(i64 immarg, ptr nocapture) #1
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+!llvm.ident = !{!6}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
+!1 = !DIFile(filename: "reduce.cpp", directory: "/")
+!2 = !{}
+!3 = !{i32 7, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{!"clang version 12.0.0"}
+!7 = distinct !DISubprogram(name: "operator*", linkageName: "_ZNK1BmlERKS_", scope: !8, file: !1, line: 14, type: !33, scopeLine: 14, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, declaration: !32, retainedNodes: !38)
+!8 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "B", file: !1, line: 6, size: 160, flags: DIFlagTypePassByValue | DIFlagNonTrivial, elements: !9, identifier: "_ZTS1B")
+!9 = !{!10, !12, !24, !28, !32}
+!10 = !DIDerivedType(tag: DW_TAG_member, name: "g", scope: !8, file: !1, line: 11, baseType: !11, size: 32, flags: DIFlagPublic)
+!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!12 = !DIDerivedType(tag: DW_TAG_member, name: "e", scope: !8, file: !1, line: 12, baseType: !13, size: 128, offset: 32, flags: DIFlagPublic)
+!13 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "a", file: !1, line: 1, size: 128, flags: DIFlagTypePassByValue, elements: !14, identifier: "_ZTS1a")
+!14 = !{!15, !20}
+!15 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !13, file: !1, line: 3, baseType: !16, size: 128, flags: DIFlagPublic)
+!16 = !DICompositeType(tag: DW_TAG_array_type, baseType: !17, size: 128, elements: !18)
+!17 = !DIBasicType(name: "float", size: 32, encoding: DW_ATE_float)
+!18 = !{!19}
+!19 = !DISubrange(count: 4)
+!20 = !DISubprogram(name: "c", linkageName: "_ZN1a1cEv", scope: !13, file: !1, line: 4, type: !21, scopeLine: 4, flags: DIFlagPublic | DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!21 = !DISubroutineType(types: !22)
+!22 = !{null, !23}
+!23 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!24 = !DISubprogram(name: "B", scope: !8, file: !1, line: 8, type: !25, scopeLine: 8, flags: DIFlagPublic | DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!25 = !DISubroutineType(types: !26)
+!26 = !{null, !27, !13}
+!27 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!28 = !DISubprogram(name: "f", linkageName: "_ZN1B1fEv", scope: !8, file: !1, line: 9, type: !29, scopeLine: 9, flags: DIFlagPublic | DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!29 = !DISubroutineType(types: !30)
+!30 = !{!31, !27}
+!31 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !13, size: 64)
+!32 = !DISubprogram(name: "operator*", linkageName: "_ZNK1BmlERKS_", scope: !8, file: !1, line: 10, type: !33, scopeLine: 10, flags: DIFlagPublic | DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!33 = !DISubroutineType(types: !34)
+!34 = !{!8, !35, !37}
+!35 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !36, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!36 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !8)
+!37 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !36, size: 64)
+!38 = !{!39, !41}
+!39 = !DILocalVariable(name: "this", arg: 1, scope: !7, type: !40, flags: DIFlagArtificial | DIFlagObjectPointer)
+!40 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !36, size: 64)
+!41 = !DILocalVariable(arg: 2, scope: !7, file: !1, line: 14, type: !37)
+!42 = !DILocation(line: 14, column: 41, scope: !7)
+!47 = !DILocation(line: 8, column: 12, scope: !48, inlinedAt: !53)
+!48 = distinct !DISubprogram(name: "B", linkageName: "_ZN1BC2E1a", scope: !8, file: !1, line: 8, type: !25, scopeLine: 8, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, declaration: !24, retainedNodes: !49)
+!49 = !{!50, !52}
+!50 = !DILocalVariable(name: "this", arg: 1, scope: !48, type: !51, flags: DIFlagArtificial | DIFlagObjectPointer)
+!51 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 64)
+!52 = !DILocalVariable(name: "d", arg: 2, scope: !48, file: !1, line: 8, type: !13)
+!53 = distinct !DILocation(line: 14, column: 41, scope: !7)
+!54 = !DILocation(line: 14, column: 34, scope: !7)
+!55 = !DILocation(line: 8, column: 12, scope: !48)
+!56 = !DILocation(line: 8, column: 18, scope: !48)
+!57 = distinct !DISubprogram(name: "j", linkageName: "_Z1jv", scope: !1, file: !1, line: 19, type: !58, scopeLine: 19, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !60)
+!58 = !DISubroutineType(types: !59)
+!59 = !{null}
+!60 = !{!61, !68, !69, !70, !71, !72}
+!61 = !DILocalVariable(name: "convexbody", scope: !57, file: !1, line: 20, type: !62)
+!62 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "h", file: !1, line: 15, size: 8, flags: DIFlagTypePassByValue, elements: !63, identifier: "_ZTS1h")
+!63 = !{!64}
+!64 = !DISubprogram(name: "i", linkageName: "_ZN1h1iEv", scope: !62, file: !1, line: 17, type: !65, scopeLine: 17, flags: DIFlagPublic | DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!65 = !DISubroutineType(types: !66)
+!66 = !{!8, !67}
+!67 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !62, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!68 = !DILocalVariable(name: "k", scope: !57, file: !1, line: 20, type: !62)
+!69 = !DILocalVariable(name: "l", scope: !57, file: !1, line: 21, type: !8)
+!70 = !DILocalVariable(name: "m", scope: !57, file: !1, line: 21, type: !8)
+!71 = !DILocalVariable(name: "n", scope: !57, file: !1, line: 21, type: !8)
+!72 = !DILocalVariable(name: "o", scope: !57, file: !1, line: 22, type: !13)
+!73 = distinct !DIAssignID()
+!74 = !DILocation(line: 0, scope: !57)
+!75 = distinct !DIAssignID()
+!76 = distinct !DIAssignID()
+!77 = distinct !DIAssignID()
+!78 = distinct !DIAssignID()
+!79 = distinct !DIAssignID()
+!80 = !DILocation(line: 20, column: 3, scope: !57)
+!81 = !DILocation(line: 21, column: 3, scope: !57)
+!82 = !DILocation(line: 21, column: 11, scope: !57)
+!83 = !DILocation(line: 21, column: 31, scope: !57)
+!84 = !DILocation(line: 14, column: 41, scope: !7, inlinedAt: !85)
+!85 = distinct !DILocation(line: 21, column: 42, scope: !57)
+!89 = !DILocation(line: 8, column: 12, scope: !48, inlinedAt: !90)
+!90 = distinct !DILocation(line: 14, column: 41, scope: !7, inlinedAt: !85)
+!91 = !DILocation(line: 22, column: 3, scope: !57)
+!92 = !DILocation(line: 9, column: 19, scope: !93, inlinedAt: !96)
+!93 = distinct !DISubprogram(name: "f", linkageName: "_ZN1B1fEv", scope: !8, file: !1, line: 9, type: !29, scopeLine: 9, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, declaration: !28, retainedNodes: !94)
+!94 = !{!95}
+!95 = !DILocalVariable(name: "this", arg: 1, scope: !93, type: !51, flags: DIFlagArtificial | DIFlagObjectPointer)
+!96 = distinct !DILocation(line: 22, column: 11, scope: !57)
+!97 = !DILocation(line: 22, column: 9, scope: !57)
+!98 = distinct !DIAssignID()
+!99 = !DILocation(line: 23, column: 5, scope: !57)
+!100 = !DILocation(line: 24, column: 1, scope: !57)
+!101 = !DILocation(line: 9, column: 19, scope: !93)
+!102 = !DILocation(line: 9, column: 12, scope: !93)
diff --git a/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/frag.ll b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/frag.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/frag.ll
@@ -0,0 +1,113 @@
+; RUN: opt %s -S -passes=sroa -o - -experimental-assignment-tracking | FileCheck %s
+
+;; $ cat test.cpp
+;; class c {
+;;   float b[4];
+;; };
+;; c fn1();
+;; void d() {
+;;   c a[3];
+;;   a[2] = fn1();
+;; }
+;;
+;; Generated by grabbing IR before sroa in:
+;; $ clang++ -O2 -g -c test.cpp -Xclang -fexperimental-assignment-tracking
+;;
+;; Check that when the memcpy to fragment(256, 128) is split into two 2xfloat
+;; stores, the dbg.assign is split into two with fragment(256, 64) &
+;; fragment(320, 64). Ensure that only the value-expression gets fragment info;
+;; that the address-expression remains untouched.
+
+; CHECK: %call = call
+; CHECK-NEXT: %0 = extractvalue { <2 x float>, <2 x float> } %call, 0
+; CHECK-NEXT: %1 = extractvalue { <2 x float>, <2 x float> } %call, 1
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata <2 x float> %0, metadata ![[var:[0-9]+]], metadata !DIExpression(DW_OP_LLVM_fragment, 256, 64),{{.+}},{{.+}}undef, metadata !DIExpression()), !dbg
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata <2 x float> %1, metadata ![[var]], metadata !DIExpression(DW_OP_LLVM_fragment, 320, 64),{{.+}},{{.+}}undef, metadata !DIExpression()), !dbg
+
+%class.c = type { [4 x float] }
+
+; Function Attrs: uwtable
+define dso_local void @_Z1dv() #0 !dbg !7 {
+entry:
+  %a = alloca [3 x %class.c], align 16, !DIAssignID !22
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !11, metadata !DIExpression(), metadata !22, metadata ptr %a, metadata !DIExpression()), !dbg !23
+  %ref.tmp = alloca %class.c, align 4
+  %0 = bitcast ptr %a to ptr, !dbg !24
+  call void @llvm.lifetime.start.p0i8(i64 48, ptr %0) #4, !dbg !24
+  %1 = bitcast ptr %ref.tmp to ptr, !dbg !25
+  call void @llvm.lifetime.start.p0i8(i64 16, ptr %1) #4, !dbg !25
+  %call = call { <2 x float>, <2 x float> } @_Z3fn1v(), !dbg !25
+  %coerce.dive = getelementptr inbounds %class.c, ptr %ref.tmp, i32 0, i32 0, !dbg !25
+  %2 = bitcast ptr %coerce.dive to ptr, !dbg !25
+  %3 = getelementptr inbounds { <2 x float>, <2 x float> }, ptr %2, i32 0, i32 0, !dbg !25
+  %4 = extractvalue { <2 x float>, <2 x float> } %call, 0, !dbg !25
+  store <2 x float> %4, ptr %3, align 4, !dbg !25
+  %5 = getelementptr inbounds { <2 x float>, <2 x float> }, ptr %2, i32 0, i32 1, !dbg !25
+  %6 = extractvalue { <2 x float>, <2 x float> } %call, 1, !dbg !25
+  store <2 x float> %6, ptr %5, align 4, !dbg !25
+  %arrayidx = getelementptr inbounds [3 x %class.c], ptr %a, i64 0, i64 2, !dbg !26
+  %7 = bitcast ptr %arrayidx to ptr, !dbg !27
+  %8 = bitcast ptr %ref.tmp to ptr, !dbg !27
+  call void @llvm.memcpy.p0i8.p0i8.i64(ptr align 16 %7, ptr align 4 %8, i64 16, i1 false), !dbg !27, !DIAssignID !32
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !11, metadata !DIExpression(DW_OP_LLVM_fragment, 256, 128), metadata !32, metadata ptr %7, metadata !DIExpression()), !dbg !23
+  %9 = bitcast ptr %ref.tmp to ptr, !dbg !26
+  call void @llvm.lifetime.end.p0i8(i64 16, ptr %9) #4, !dbg !26
+  %10 = bitcast ptr %a to ptr, !dbg !33
+  call void @llvm.lifetime.end.p0i8(i64 48, ptr %10) #4, !dbg !33
+  ret void, !dbg !33
+}
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.lifetime.start.p0i8(i64 immarg, ptr nocapture) #1
+
+; Function Attrs: nofree nosync nounwind readnone speculatable willreturn
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
+
+declare !dbg !34 dso_local { <2 x float>, <2 x float> } @_Z3fn1v() #3
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.memcpy.p0i8.p0i8.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #1
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.lifetime.end.p0i8(i64 immarg, ptr nocapture) #1
+
+; Function Attrs: nofree nosync nounwind readnone speculatable willreturn
+declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #2
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+!llvm.ident = !{!6}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
+!1 = !DIFile(filename: "reduce.cpp", directory: "/")
+!2 = !{}
+!3 = !{i32 7, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{!"clang version 12.0.0"}
+!7 = distinct !DISubprogram(name: "d", linkageName: "_Z1dv", scope: !1, file: !1, line: 5, type: !8, scopeLine: 5, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !10)
+!8 = !DISubroutineType(types: !9)
+!9 = !{null}
+!10 = !{!11}
+!11 = !DILocalVariable(name: "a", scope: !7, file: !1, line: 6, type: !12)
+!12 = !DICompositeType(tag: DW_TAG_array_type, baseType: !13, size: 384, elements: !20)
+!13 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "c", file: !1, line: 1, size: 128, flags: DIFlagTypePassByValue, elements: !14, identifier: "_ZTS1c")
+!14 = !{!15}
+!15 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !13, file: !1, line: 2, baseType: !16, size: 128)
+!16 = !DICompositeType(tag: DW_TAG_array_type, baseType: !17, size: 128, elements: !18)
+!17 = !DIBasicType(name: "float", size: 32, encoding: DW_ATE_float)
+!18 = !{!19}
+!19 = !DISubrange(count: 4)
+!20 = !{!21}
+!21 = !DISubrange(count: 3)
+!22 = distinct !DIAssignID()
+!23 = !DILocation(line: 0, scope: !7)
+!24 = !DILocation(line: 6, column: 3, scope: !7)
+!25 = !DILocation(line: 7, column: 10, scope: !7)
+!26 = !DILocation(line: 7, column: 3, scope: !7)
+!27 = !DILocation(line: 7, column: 8, scope: !7)
+!32 = distinct !DIAssignID()
+!33 = !DILocation(line: 8, column: 1, scope: !7)
+!34 = !DISubprogram(name: "fn1", linkageName: "_Z3fn1v", scope: !1, file: !1, line: 4, type: !35, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
+!35 = !DISubroutineType(types: !36)
+!36 = !{!13}
diff --git a/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/id.ll b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/id.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/id.ll
@@ -0,0 +1,174 @@
+; RUN: opt -passes=sroa -S %s -o - -experimental-assignment-tracking | FileCheck %s
+
+;; Check that multiple dbg.assign intrinsics linked to a store that is getting
+;; split (or at least that is touched by SROA, causing a replacement store to
+;; be generated) are still both linked to the new store(s).
+;;
+;; Additionally, check that SROA inserts new dbg.assign intrinsics by the
+;; originals.
+
+;; $ cat test.cpp
+;; class a {
+;; public:
+;;   a(int, float &) {}
+;; };
+;; float b, d;
+;; int c;
+;; void f() {
+;;   float e;
+;;   if (c)
+;;     e = b;
+;;   else
+;;     e = b / d;
+;;   a(c, e);
+;; }
+;;
+;; Generated by grabbing IR before sroa in:
+;; $ clang++ -O2 -g -c test.cpp -Xclang -fexperimental-assignment-tracking 
+
+; CHECK: if.then:
+; CHECK-NEXT: %1 = load float
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata float %storemerge, metadata ![[var:[0-9]+]], metadata !DIExpression(), metadata ![[id:[0-9]+]], metadata ptr undef, metadata !DIExpression()), !dbg ![[dbg:[0-9]+]]
+
+; CHECK: if.else:
+; CHECK-NEXT: %2 = load float
+; CHECK-NEXT: %3 = load float
+; CHECK-NEXT: %div = fdiv float
+; CHECK: call void @llvm.dbg.assign(metadata float %storemerge, metadata ![[var]], metadata !DIExpression(), metadata ![[id]], metadata ptr undef, metadata !DIExpression()), !dbg ![[dbg]]
+
+%class.a = type { i8 }
+
+$_ZN1aC2EiRf = comdat any
+
+@b = dso_local local_unnamed_addr global float 0.000000e+00, align 4, !dbg !0
+@d = dso_local local_unnamed_addr global float 0.000000e+00, align 4, !dbg !6
+@c = dso_local local_unnamed_addr global i32 0, align 4, !dbg !9
+
+; Function Attrs: nounwind readonly uwtable
+define dso_local void @_Z1fv() local_unnamed_addr #0 !dbg !16 {
+entry:
+  %e = alloca float, align 4, !DIAssignID !21
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !20, metadata !DIExpression(), metadata !21, metadata ptr %e, metadata !DIExpression()), !dbg !22
+  %agg.tmp.ensured = alloca %class.a, align 1
+  %0 = bitcast ptr %e to ptr, !dbg !23
+  call void @llvm.lifetime.start.p0i8(i64 4, ptr nonnull %0) #4, !dbg !23
+  %1 = load i32, ptr @c, align 4, !dbg !24
+  %tobool.not = icmp eq i32 %1, 0, !dbg !24
+  br i1 %tobool.not, label %if.else, label %if.then, !dbg !30
+
+if.then:                                          ; preds = %entry
+  %2 = load float, ptr @b, align 4, !dbg !31
+  call void @llvm.dbg.assign(metadata float %2, metadata !20, metadata !DIExpression(), metadata !34, metadata ptr %e, metadata !DIExpression()), !dbg !22
+  br label %if.end, !dbg !35
+
+if.else:                                          ; preds = %entry
+  %3 = load float, ptr @b, align 4, !dbg !36
+  %4 = load float, ptr @d, align 4, !dbg !37
+  %div = fdiv float %3, %4, !dbg !38
+  call void @llvm.dbg.assign(metadata float %div, metadata !20, metadata !DIExpression(), metadata !34, metadata ptr %e, metadata !DIExpression()), !dbg !22
+  br label %if.end
+
+if.end:                                           ; preds = %if.else, %if.then
+  %storemerge = phi float [ %div, %if.else ], [ %2, %if.then ], !dbg !39
+  store float %storemerge, ptr %e, align 4, !dbg !39, !DIAssignID !34
+  %5 = load i32, ptr @c, align 4, !dbg !40
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !41, metadata !DIExpression(), metadata !54, metadata ptr undef, metadata !DIExpression()), !dbg !55
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !51, metadata !DIExpression(), metadata !57, metadata ptr undef, metadata !DIExpression()), !dbg !55
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !52, metadata !DIExpression(), metadata !58, metadata ptr undef, metadata !DIExpression()), !dbg !55
+  call void @llvm.dbg.assign(metadata ptr %agg.tmp.ensured, metadata !41, metadata !DIExpression(), metadata !59, metadata ptr undef, metadata !DIExpression()), !dbg !55
+  call void @llvm.dbg.assign(metadata i32 %5, metadata !51, metadata !DIExpression(), metadata !60, metadata ptr undef, metadata !DIExpression()), !dbg !55
+  call void @llvm.dbg.assign(metadata ptr %e, metadata !52, metadata !DIExpression(), metadata !61, metadata ptr undef, metadata !DIExpression()), !dbg !55
+  call void @llvm.lifetime.end.p0i8(i64 4, ptr nonnull %0) #4, !dbg !62
+  ret void, !dbg !62
+}
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.lifetime.start.p0i8(i64 immarg, ptr nocapture) #1
+
+; Function Attrs: nounwind uwtable
+define linkonce_odr dso_local void @_ZN1aC2EiRf(ptr %this, i32 %0, ptr nonnull align 4 dereferenceable(4) %1) unnamed_addr #2 comdat align 2 !dbg !42 {
+entry:
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !41, metadata !DIExpression(), metadata !63, metadata ptr undef, metadata !DIExpression()), !dbg !64
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !51, metadata !DIExpression(), metadata !65, metadata ptr undef, metadata !DIExpression()), !dbg !64
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !52, metadata !DIExpression(), metadata !66, metadata ptr undef, metadata !DIExpression()), !dbg !64
+  call void @llvm.dbg.assign(metadata ptr %this, metadata !41, metadata !DIExpression(), metadata !67, metadata ptr undef, metadata !DIExpression()), !dbg !64
+  call void @llvm.dbg.assign(metadata i32 %0, metadata !51, metadata !DIExpression(), metadata !68, metadata ptr undef, metadata !DIExpression()), !dbg !64
+  call void @llvm.dbg.assign(metadata ptr %1, metadata !52, metadata !DIExpression(), metadata !69, metadata ptr undef, metadata !DIExpression()), !dbg !64
+  ret void, !dbg !70
+}
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.lifetime.end.p0i8(i64 immarg, ptr nocapture) #1
+
+; Function Attrs: nofree nosync nounwind readnone speculatable willreturn
+declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #3
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!12, !13, !14}
+!llvm.ident = !{!15}
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "b", scope: !2, file: !3, line: 5, type: !8, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
+!3 = !DIFile(filename: "reduce.cpp", directory: "")
+!4 = !{}
+!5 = !{!0, !6, !9}
+!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
+!7 = distinct !DIGlobalVariable(name: "d", scope: !2, file: !3, line: 5, type: !8, isLocal: false, isDefinition: true)
+!8 = !DIBasicType(name: "float", size: 32, encoding: DW_ATE_float)
+!9 = !DIGlobalVariableExpression(var: !10, expr: !DIExpression())
+!10 = distinct !DIGlobalVariable(name: "c", scope: !2, file: !3, line: 6, type: !11, isLocal: false, isDefinition: true)
+!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!12 = !{i32 7, !"Dwarf Version", i32 4}
+!13 = !{i32 2, !"Debug Info Version", i32 3}
+!14 = !{i32 1, !"wchar_size", i32 4}
+!15 = !{!"clang version 12.0.0"}
+!16 = distinct !DISubprogram(name: "f", linkageName: "_Z1fv", scope: !3, file: !3, line: 7, type: !17, scopeLine: 7, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !19)
+!17 = !DISubroutineType(types: !18)
+!18 = !{null}
+!19 = !{!20}
+!20 = !DILocalVariable(name: "e", scope: !16, file: !3, line: 8, type: !8)
+!21 = distinct !DIAssignID()
+!22 = !DILocation(line: 0, scope: !16)
+!23 = !DILocation(line: 8, column: 3, scope: !16)
+!24 = !DILocation(line: 9, column: 7, scope: !25)
+!25 = distinct !DILexicalBlock(scope: !16, file: !3, line: 9, column: 7)
+!30 = !DILocation(line: 9, column: 7, scope: !16)
+!31 = !DILocation(line: 10, column: 9, scope: !25)
+!34 = distinct !DIAssignID()
+!35 = !DILocation(line: 10, column: 5, scope: !25)
+!36 = !DILocation(line: 12, column: 9, scope: !25)
+!37 = !DILocation(line: 12, column: 13, scope: !25)
+!38 = !DILocation(line: 12, column: 11, scope: !25)
+!39 = !DILocation(line: 0, scope: !25)
+!40 = !DILocation(line: 13, column: 5, scope: !16)
+!41 = !DILocalVariable(name: "this", arg: 1, scope: !42, type: !53, flags: DIFlagArtificial | DIFlagObjectPointer)
+!42 = distinct !DISubprogram(name: "a", linkageName: "_ZN1aC2EiRf", scope: !43, file: !3, line: 3, type: !46, scopeLine: 3, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, declaration: !45, retainedNodes: !50)
+!43 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "a", file: !3, line: 1, size: 8, flags: DIFlagTypePassByValue | DIFlagNonTrivial, elements: !44, identifier: "_ZTS1a")
+!44 = !{!45}
+!45 = !DISubprogram(name: "a", scope: !43, file: !3, line: 3, type: !46, scopeLine: 3, flags: DIFlagPublic | DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!46 = !DISubroutineType(types: !47)
+!47 = !{null, !48, !11, !49}
+!48 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !43, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!49 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !8, size: 64)
+!50 = !{!41, !51, !52}
+!51 = !DILocalVariable(arg: 2, scope: !42, file: !3, line: 3, type: !11)
+!52 = !DILocalVariable(arg: 3, scope: !42, file: !3, line: 3, type: !49)
+!53 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !43, size: 64)
+!54 = distinct !DIAssignID()
+!55 = !DILocation(line: 0, scope: !42, inlinedAt: !56)
+!56 = distinct !DILocation(line: 13, column: 3, scope: !16)
+!57 = distinct !DIAssignID()
+!58 = distinct !DIAssignID()
+!59 = distinct !DIAssignID()
+!60 = distinct !DIAssignID()
+!61 = distinct !DIAssignID()
+!62 = !DILocation(line: 14, column: 1, scope: !16)
+!63 = distinct !DIAssignID()
+!64 = !DILocation(line: 0, scope: !42)
+!65 = distinct !DIAssignID()
+!66 = distinct !DIAssignID()
+!67 = distinct !DIAssignID()
+!68 = distinct !DIAssignID()
+!69 = distinct !DIAssignID()
+!70 = !DILocation(line: 3, column: 20, scope: !42)
diff --git a/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/memcpy.ll b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/memcpy.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/memcpy.ll
@@ -0,0 +1,117 @@
+; RUN: opt -passes=sroa,verify -S %s -o - -experimental-assignment-tracking \
+; RUN: | FileCheck %s --implicit-check-not="call void @llvm.dbg"
+
+;; Check that the new slices of an alloca and memcpy intructions get dbg.assign
+;; intrinsics with the correct fragment info.
+;;
+;; Also check that the new dbg.assign intrinsics are inserted after each split
+;; store. See llvm/test/DebugInfo/Generic/dbg-assign-sroa-id.ll for the
+;; counterpart check. Ensure that only the value-expression gets fragment info;
+;; that the address-expression remains untouched.
+
+;; $ cat test.cpp
+;; struct LargeStruct {
+;;   int A, B, C;
+;;   int Var;
+;;   int D, E, F;
+;; };
+;; LargeStruct From;
+;; int example() {
+;;   LargeStruct To = From;
+;;   return To.Var;
+;; }
+;; $ clang test.cpp -Xclang -fexperimental-assignment-tracking \
+;;     -Xclang -disable-llvm-passes -O2 -g -c -S -emit-llvm -o -
+
+;; Split alloca.
+; CHECK: entry:
+; CHECK-NEXT: %To.sroa.0 = alloca { i32, i32, i32 }, align 8, !DIAssignID ![[ID_1:[0-9]+]]
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata {{.+}} undef, metadata ![[TO:[0-9]+]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 96), metadata ![[ID_1]], metadata ptr %To.sroa.0, metadata !DIExpression()), !dbg
+
+; CHECK-NEXT: %To.sroa.4 = alloca { i32, i32, i32 }, align 8, !DIAssignID ![[ID_3:[0-9]+]]
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata {{.+}} undef, metadata ![[TO]], metadata !DIExpression(DW_OP_LLVM_fragment, 128, 96), metadata ![[ID_3]], metadata ptr %To.sroa.4, metadata !DIExpression()), !dbg
+
+;; Split memcpy.
+; CHECK: call void @llvm.memcpy{{.*}}(ptr align 8 %To.sroa.0, ptr align 4 @From, i64 12, i1 false),{{.*}}!DIAssignID ![[ID_4:[0-9]+]]
+;; This slice has been split and is promoted.
+; CHECK: %To.sroa.3.0.copyload = load i32, ptr getelementptr inbounds (i8, ptr @From, i64 12)
+; CHECK: call void @llvm.memcpy{{.*}}(ptr align 8 %To.sroa.4, ptr align 4 getelementptr inbounds (i8, ptr @From, i64 16), i64 12, i1 false){{.*}}!DIAssignID ![[ID_6:[0-9]+]]
+
+;; Intrinsics for the splits above.
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata {{.+}} undef, metadata ![[TO]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 96), metadata ![[ID_4]], metadata ptr %To.sroa.0, metadata !DIExpression()), !dbg
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i32 %To.sroa.3.0.copyload, metadata ![[TO]], metadata !DIExpression(DW_OP_LLVM_fragment, 96, 32), metadata !{{.+}}, metadata ptr undef, metadata !DIExpression()), !dbg
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata {{.+}} undef, metadata ![[TO]], metadata !DIExpression(DW_OP_LLVM_fragment, 128, 96), metadata ![[ID_6]], metadata ptr %To.sroa.4, metadata !DIExpression()), !dbg
+
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+
+%struct.LargeStruct = type { i32, i32, i32, i32, i32, i32, i32 }
+
+@From = dso_local global %struct.LargeStruct zeroinitializer, align 4, !dbg !0
+
+; Function Attrs: nounwind uwtable mustprogress
+define dso_local i32 @_Z7examplev() #0 !dbg !20 {
+entry:
+  %To = alloca %struct.LargeStruct, align 4, !DIAssignID !25
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !24, metadata !DIExpression(), metadata !25, metadata ptr %To, metadata !DIExpression()), !dbg !26
+  %0 = bitcast ptr %To to ptr, !dbg !27
+  call void @llvm.lifetime.start.p0i8(i64 28, ptr %0) #3, !dbg !27
+  %1 = bitcast ptr %To to ptr, !dbg !28
+  call void @llvm.memcpy.p0i8.p0i8.i64(ptr align 4 %1, ptr align 4 bitcast (ptr @From to ptr), i64 28, i1 false), !dbg !28, !DIAssignID !34
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !24, metadata !DIExpression(), metadata !34, metadata ptr %1, metadata !DIExpression()), !dbg !28
+  %Var = getelementptr inbounds %struct.LargeStruct, ptr %To, i32 0, i32 3, !dbg !35
+  %2 = load i32, ptr %Var, align 4, !dbg !35
+  %3 = bitcast ptr %To to ptr, !dbg !38
+  call void @llvm.lifetime.end.p0i8(i64 28, ptr %3) #3, !dbg !38
+  ret i32 %2, !dbg !39
+}
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.lifetime.start.p0i8(i64 immarg, ptr nocapture) #1
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.memcpy.p0i8.p0i8.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #1
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.lifetime.end.p0i8(i64 immarg, ptr nocapture) #1
+
+; Function Attrs: nofree nosync nounwind readnone speculatable willreturn
+declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #2
+
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!16, !17, !18}
+!llvm.ident = !{!19}
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "From", scope: !2, file: !3, line: 6, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !3, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
+!3 = !DIFile(filename: "sroa-test.cpp", directory: "/")
+!4 = !{}
+!5 = !{!0}
+!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "LargeStruct", file: !3, line: 1, size: 224, flags: DIFlagTypePassByValue, elements: !7, identifier: "_ZTS11LargeStruct")
+!7 = !{!8, !10, !11, !12, !13, !14, !15}
+!8 = !DIDerivedType(tag: DW_TAG_member, name: "A", scope: !6, file: !3, line: 2, baseType: !9, size: 32)
+!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!10 = !DIDerivedType(tag: DW_TAG_member, name: "B", scope: !6, file: !3, line: 2, baseType: !9, size: 32, offset: 32)
+!11 = !DIDerivedType(tag: DW_TAG_member, name: "C", scope: !6, file: !3, line: 2, baseType: !9, size: 32, offset: 64)
+!12 = !DIDerivedType(tag: DW_TAG_member, name: "Var", scope: !6, file: !3, line: 3, baseType: !9, size: 32, offset: 96)
+!13 = !DIDerivedType(tag: DW_TAG_member, name: "D", scope: !6, file: !3, line: 4, baseType: !9, size: 32, offset: 128)
+!14 = !DIDerivedType(tag: DW_TAG_member, name: "E", scope: !6, file: !3, line: 4, baseType: !9, size: 32, offset: 160)
+!15 = !DIDerivedType(tag: DW_TAG_member, name: "F", scope: !6, file: !3, line: 4, baseType: !9, size: 32, offset: 192)
+!16 = !{i32 7, !"Dwarf Version", i32 4}
+!17 = !{i32 2, !"Debug Info Version", i32 3}
+!18 = !{i32 1, !"wchar_size", i32 4}
+!19 = !{!"clang version 12.0.0"}
+!20 = distinct !DISubprogram(name: "example", linkageName: "_Z7examplev", scope: !3, file: !3, line: 7, type: !21, scopeLine: 7, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !23)
+!21 = !DISubroutineType(types: !22)
+!22 = !{!9}
+!23 = !{!24}
+!24 = !DILocalVariable(name: "To", scope: !20, file: !3, line: 8, type: !6)
+!25 = distinct !DIAssignID()
+!26 = !DILocation(line: 0, scope: !20)
+!27 = !DILocation(line: 8, column: 3, scope: !20)
+!28 = !DILocation(line: 8, column: 20, scope: !20)
+!34 = distinct !DIAssignID()
+!35 = !DILocation(line: 9, column: 13, scope: !20)
+!38 = !DILocation(line: 10, column: 1, scope: !20)
+!39 = !DILocation(line: 9, column: 3, scope: !20)
diff --git a/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/memmove-to-from-same-alloca.ll b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/memmove-to-from-same-alloca.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/memmove-to-from-same-alloca.ll
@@ -0,0 +1,163 @@
+; RUN: opt %s -passes=sroa -o - -S -experimental-assignment-tracking \
+; RUN: | FileCheck %s
+
+;; Generated from this C++ source:
+;; __attribute__((nodebug)) struct Blob {int P[6];} Glob;
+;; __attribute__((nodebug)) int Cond;
+;; __attribute__((nodebug)) Blob *C;
+;; __attribute__((nodebug)) void call(int);
+;; 
+;; void f() {
+;;   int A[16];
+;;   __attribute__ ((nodebug)) int B[16];
+;;   // A[0:6) <- Glob
+;;   __builtin_memmove(&A[0], &Glob, sizeof(Blob));
+;;   call(0);
+;;   // B[8:14) <- Glob
+;;   __builtin_memmove(&B[8], &Glob, sizeof(Blob));  
+;;   call(A[0]);
+;;   // A[8:14) <- A[0:6)
+;;   __builtin_memmove(&A[8], &A[0], sizeof(Blob));
+;;   call(A[8]);
+;;   if (Cond)
+;;     // C <- A[8:14)
+;;     __builtin_memmove(C, &A[8], sizeof(Blob));
+;;   else
+;;     // C <- B[8:14)
+;;     __builtin_memmove(C, &B[8], sizeof(Blob));    
+;; }
+;; 
+;; using:
+;;   clang test.cpp -emit-llvm -S -g -O2 -Xclang -disable-llvm-passes -o - \
+;;   | opt -passes=declare-to-assign -o test.ll - -S
+
+;; We're interested in variable A and the second memmove with A as a dest (the
+;; third memmove in the source). SROA is going to chop up A so that the only
+;; Alloca'd slice remaining is what were originally elements 1 through 5
+;; inclusive (element 0 is promoted). Incidentally, the memmove later becomes a
+;; memcpy. Check that the dbg.assign address and fragment are correct and
+;; ensure the DIAssignID still links it to the memmove(/memcpy).
+
+; CHECK: %A.sroa.0.sroa.5 = alloca [5 x i32]
+; CHECK: llvm.memcpy{{.*}}(ptr align 4 %A.sroa.0.sroa.5, ptr align 4 getelementptr inbounds (i8, ptr @Glob, i64 4), i64 20, i1 false){{.*}}!DIAssignID ![[ID:[0-9]+]]
+;; Here's the dbg.assign for element 0 - it's not important for the test.
+; CHECK-NEXT: llvm.dbg.assign({{.*}}!DIExpression(DW_OP_LLVM_fragment, 0, 32){{.*}})
+;; This is the dbg.assign we care about:
+; CHECK-NEXT: llvm.dbg.assign(metadata i1 undef, metadata ![[VAR:[0-9]+]], metadata !DIExpression(DW_OP_LLVM_fragment, 32, 160), metadata ![[ID]], metadata ptr %A.sroa.0.sroa.5, metadata !DIExpression())
+
+; CHECK: ![[VAR]] = !DILocalVariable(name: "A"
+
+source_filename = "test.cpp"
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+%struct.Blob = type { [6 x i32] }
+
+@Glob = dso_local global %struct.Blob zeroinitializer, align 4
+@Cond = dso_local global i32 0, align 4
+@C = dso_local global ptr null, align 8
+
+; Function Attrs: mustprogress uwtable
+define dso_local void @_Z1fv() #0 !dbg !9 {
+entry:
+  %A = alloca [16 x i32], align 16, !DIAssignID !18
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !13, metadata !DIExpression(), metadata !18, metadata ptr %A, metadata !DIExpression()), !dbg !19
+  %B = alloca [16 x i32], align 16
+  call void @llvm.lifetime.start.p0(i64 64, ptr %A) #5, !dbg !20
+  call void @llvm.lifetime.start.p0(i64 64, ptr %B) #5, !dbg !21
+  %arrayidx = getelementptr inbounds [16 x i32], ptr %A, i64 0, i64 0, !dbg !22
+  call void @llvm.memmove.p0.p0.i64(ptr align 16 %arrayidx, ptr align 4 @Glob, i64 24, i1 false), !dbg !23, !DIAssignID !24
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 192), metadata !24, metadata ptr %arrayidx, metadata !DIExpression()), !dbg !19
+  call void @_Z4calli(i32 noundef 0), !dbg !25
+  %arrayidx1 = getelementptr inbounds [16 x i32], ptr %B, i64 0, i64 8, !dbg !26
+  call void @llvm.memmove.p0.p0.i64(ptr align 16 %arrayidx1, ptr align 4 @Glob, i64 24, i1 false), !dbg !27
+  %arrayidx2 = getelementptr inbounds [16 x i32], ptr %A, i64 0, i64 0, !dbg !28
+  %0 = load i32, ptr %arrayidx2, align 16, !dbg !28
+  call void @_Z4calli(i32 noundef %0), !dbg !33
+  %arrayidx3 = getelementptr inbounds [16 x i32], ptr %A, i64 0, i64 8, !dbg !34
+  %arrayidx4 = getelementptr inbounds [16 x i32], ptr %A, i64 0, i64 0, !dbg !35
+  call void @llvm.memmove.p0.p0.i64(ptr align 16 %arrayidx3, ptr align 16 %arrayidx4, i64 24, i1 false), !dbg !36, !DIAssignID !37
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 256, 192), metadata !37, metadata ptr %arrayidx3, metadata !DIExpression()), !dbg !19
+  %arrayidx5 = getelementptr inbounds [16 x i32], ptr %A, i64 0, i64 8, !dbg !38
+  %1 = load i32, ptr %arrayidx5, align 16, !dbg !38
+  call void @_Z4calli(i32 noundef %1), !dbg !39
+  %2 = load i32, ptr @Cond, align 4, !dbg !40
+  %tobool = icmp ne i32 %2, 0, !dbg !40
+  br i1 %tobool, label %if.then, label %if.else, !dbg !42
+
+if.then:                                          ; preds = %entry
+  %3 = load ptr, ptr @C, align 8, !dbg !43
+  %arrayidx6 = getelementptr inbounds [16 x i32], ptr %A, i64 0, i64 8, !dbg !46
+  call void @llvm.memmove.p0.p0.i64(ptr align 4 %3, ptr align 16 %arrayidx6, i64 24, i1 false), !dbg !47
+  br label %if.end, !dbg !47
+
+if.else:                                          ; preds = %entry
+  %4 = load ptr, ptr @C, align 8, !dbg !48
+  %arrayidx7 = getelementptr inbounds [16 x i32], ptr %B, i64 0, i64 8, !dbg !49
+  call void @llvm.memmove.p0.p0.i64(ptr align 4 %4, ptr align 16 %arrayidx7, i64 24, i1 false), !dbg !50
+  br label %if.end
+
+if.end:                                           ; preds = %if.else, %if.then
+  call void @llvm.lifetime.end.p0(i64 64, ptr %B) #5, !dbg !51
+  call void @llvm.lifetime.end.p0(i64 64, ptr %A) #5, !dbg !51
+  ret void, !dbg !51
+}
+
+declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
+declare void @llvm.memmove.p0.p0.i64(ptr nocapture writeonly, ptr nocapture readonly, i64, i1 immarg) #3
+declare void @_Z4calli(i32 noundef) #4
+declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1
+declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #2
+
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!2, !3, !4, !5, !6, !7}
+!llvm.ident = !{!8}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 16.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
+!1 = !DIFile(filename: "test.cpp", directory: "/")
+!2 = !{i32 7, !"Dwarf Version", i32 5}
+!3 = !{i32 2, !"Debug Info Version", i32 3}
+!4 = !{i32 1, !"wchar_size", i32 4}
+!5 = !{i32 8, !"PIC Level", i32 2}
+!6 = !{i32 7, !"PIE Level", i32 2}
+!7 = !{i32 7, !"uwtable", i32 2}
+!8 = !{!"clang version 16.0.0"}
+!9 = distinct !DISubprogram(name: "f", linkageName: "_Z1fv", scope: !1, file: !1, line: 6, type: !10, scopeLine: 6, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12)
+!10 = !DISubroutineType(types: !11)
+!11 = !{null}
+!12 = !{!13}
+!13 = !DILocalVariable(name: "A", scope: !9, file: !1, line: 7, type: !14)
+!14 = !DICompositeType(tag: DW_TAG_array_type, baseType: !15, size: 512, elements: !16)
+!15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!16 = !{!17}
+!17 = !DISubrange(count: 16)
+!18 = distinct !DIAssignID()
+!19 = !DILocation(line: 0, scope: !9)
+!20 = !DILocation(line: 7, column: 3, scope: !9)
+!21 = !DILocation(line: 8, column: 3, scope: !9)
+!22 = !DILocation(line: 10, column: 22, scope: !9)
+!23 = !DILocation(line: 10, column: 3, scope: !9)
+!24 = distinct !DIAssignID()
+!25 = !DILocation(line: 11, column: 3, scope: !9)
+!26 = !DILocation(line: 13, column: 22, scope: !9)
+!27 = !DILocation(line: 13, column: 3, scope: !9)
+!28 = !DILocation(line: 14, column: 8, scope: !9)
+!33 = !DILocation(line: 14, column: 3, scope: !9)
+!34 = !DILocation(line: 16, column: 22, scope: !9)
+!35 = !DILocation(line: 16, column: 29, scope: !9)
+!36 = !DILocation(line: 16, column: 3, scope: !9)
+!37 = distinct !DIAssignID()
+!38 = !DILocation(line: 17, column: 8, scope: !9)
+!39 = !DILocation(line: 17, column: 3, scope: !9)
+!40 = !DILocation(line: 18, column: 7, scope: !41)
+!41 = distinct !DILexicalBlock(scope: !9, file: !1, line: 18, column: 7)
+!42 = !DILocation(line: 18, column: 7, scope: !9)
+!43 = !DILocation(line: 20, column: 23, scope: !41)
+!46 = !DILocation(line: 20, column: 27, scope: !41)
+!47 = !DILocation(line: 20, column: 5, scope: !41)
+!48 = !DILocation(line: 23, column: 23, scope: !41)
+!49 = !DILocation(line: 23, column: 27, scope: !41)
+!50 = !DILocation(line: 23, column: 5, scope: !41)
+!51 = !DILocation(line: 24, column: 1, scope: !9)
diff --git a/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/rewrite.ll b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/rewrite.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/rewrite.ll
@@ -0,0 +1,130 @@
+; RUN: opt -passes=sroa,verify -S %s -experimental-assignment-tracking -o - \
+; RUN: | FileCheck %s --implicit-check-not="call void @llvm.dbg"
+
+; Check that the new slices of an alloca and memset intructions get dbg.assign
+; intrinsics with the correct fragment info. Ensure that only the
+; value-expression gets fragment info; that the address-expression remains
+; untouched.
+
+;; $ cat test.cpp
+;; void do_something();
+;; struct LargeStruct {
+;;   int A, B, C;
+;;   int Var;
+;;   int D, E, F;
+;; };
+;; int Glob;
+;; bool Cond;
+;; int example() {
+;;   LargeStruct S = {0};
+;;   S.Var = Glob;
+;;   return S.Var;
+;; }
+;; $ clang test.cpp -Xclang -disable-llvm-passes -O2 -g -c -S -emit-llvm -o -
+
+; CHECK: entry:
+; CHECK-NEXT:   %S.sroa.0 = alloca { i32, i32, i32 }, align 8, !DIAssignID ![[ID_1:[0-9]+]]
+; CHECK-NEXT:   call void @llvm.dbg.assign(metadata i1 undef, metadata ![[VAR:[0-9]+]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 96), metadata ![[ID_1]], metadata ptr %S.sroa.0, metadata !DIExpression()), !dbg
+
+;; The middle slice has been promoted, so the alloca has gone away.
+
+; CHECK-NEXT:   %S.sroa.5 = alloca { i32, i32, i32 }, align 8, !DIAssignID ![[ID_3:[0-9]+]]
+; CHECK-NEXT:   call void @llvm.dbg.assign(metadata i1 undef, metadata ![[VAR]], metadata !DIExpression(DW_OP_LLVM_fragment, 128, 96), metadata ![[ID_3]], metadata ptr %S.sroa.5, metadata !DIExpression()), !dbg
+
+;; The memset has been sliced up (middle slice removed).
+; CHECK: call void @llvm.memset{{.*}}(ptr align 8 %S.sroa.0, i8 0, i64 12, i1 false), !dbg !{{.+}}, !DIAssignID ![[ID_5:[0-9]+]]
+; CHECK: call void @llvm.memset{{.*}}(ptr align 8 %S.sroa.5, i8 0, i64 12, i1 false), !dbg !{{.+}}, !DIAssignID ![[ID_6:[0-9]+]]
+
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i8 0, metadata ![[VAR]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 96), metadata ![[ID_5]], metadata ptr %S.sroa.0, metadata !DIExpression()), !dbg
+;; Check the middle slice (no memset) gets a correct dbg.assign.
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i32 0, metadata ![[VAR]], metadata !DIExpression(DW_OP_LLVM_fragment, 96, 32), metadata !{{.+}}, metadata ptr undef, metadata !DIExpression()), !dbg
+; CHECK-NEXT:   call void @llvm.dbg.assign(metadata i8 0, metadata ![[VAR]], metadata !DIExpression(DW_OP_LLVM_fragment, 128, 96), metadata ![[ID_6]], metadata ptr %S.sroa.5, metadata !DIExpression()), !dbg
+
+;; mem2reg promotes the load/store to the middle slice created by SROA:
+; CHECK-NEXT: %0 = load i32, ptr @Glob, align 4, !dbg !{{.+}}
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i32 %0, metadata ![[VAR]], metadata !DIExpression(DW_OP_LLVM_fragment, 96, 32), metadata ![[ID_4:[0-9]+]], metadata ptr undef, metadata !DIExpression()), !dbg
+
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+
+%struct.LargeStruct = type { i32, i32, i32, i32, i32, i32, i32 }
+
+@Glob = dso_local global i32 0, align 4, !dbg !0
+@Cond = dso_local global i8 0, align 1, !dbg !6
+
+; Function Attrs: nounwind uwtable mustprogress
+define dso_local i32 @_Z7examplev() #0 !dbg !14 {
+entry:
+  %S = alloca %struct.LargeStruct, align 4, !DIAssignID !28
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !18, metadata !DIExpression(), metadata !28, metadata ptr %S, metadata !DIExpression()), !dbg !29
+  %0 = bitcast ptr %S to ptr, !dbg !30
+  call void @llvm.lifetime.start.p0i8(i64 28, ptr %0) #4, !dbg !30
+  %1 = bitcast ptr %S to ptr, !dbg !31
+  call void @llvm.memset.p0i8.i64(ptr align 4 %1, i8 0, i64 28, i1 false), !dbg !31, !DIAssignID !32
+  call void @llvm.dbg.assign(metadata i8 0, metadata !18, metadata !DIExpression(), metadata !32, metadata ptr %1, metadata !DIExpression()), !dbg !31
+  %2 = load i32, ptr @Glob, align 4, !dbg !33
+  %Var = getelementptr inbounds %struct.LargeStruct, ptr %S, i32 0, i32 3, !dbg !38
+  store i32 %2, ptr %Var, align 4, !dbg !39, !DIAssignID !42
+  call void @llvm.dbg.assign(metadata i32 %2, metadata !18, metadata !DIExpression(DW_OP_LLVM_fragment, 96, 32), metadata !42, metadata ptr %Var, metadata !DIExpression()), !dbg !39
+  %Var1 = getelementptr inbounds %struct.LargeStruct, ptr %S, i32 0, i32 3, !dbg !43
+  %3 = load i32, ptr %Var1, align 4, !dbg !43
+  %4 = bitcast ptr %S to ptr, !dbg !44
+  call void @llvm.lifetime.end.p0i8(i64 28, ptr %4) #4, !dbg !44
+  ret i32 %3, !dbg !45
+}
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.lifetime.start.p0i8(i64 immarg, ptr nocapture) #1
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn writeonly
+declare void @llvm.memset.p0i8.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #2
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.lifetime.end.p0i8(i64 immarg, ptr nocapture) #1
+
+; Function Attrs: nofree nosync nounwind readnone speculatable willreturn
+declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #3
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!10, !11, !12}
+!llvm.ident = !{!13}
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "Glob", scope: !2, file: !3, line: 7, type: !9, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !3, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
+!3 = !DIFile(filename: "test.cpp", directory: "/")
+!4 = !{}
+!5 = !{!0, !6}
+!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
+!7 = distinct !DIGlobalVariable(name: "Cond", scope: !2, file: !3, line: 8, type: !8, isLocal: false, isDefinition: true)
+!8 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean)
+!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!10 = !{i32 7, !"Dwarf Version", i32 4}
+!11 = !{i32 2, !"Debug Info Version", i32 3}
+!12 = !{i32 1, !"wchar_size", i32 4}
+!13 = !{!"clang version 12.0.0"}
+!14 = distinct !DISubprogram(name: "example", linkageName: "_Z7examplev", scope: !3, file: !3, line: 9, type: !15, scopeLine: 9, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !17)
+!15 = !DISubroutineType(types: !16)
+!16 = !{!9}
+!17 = !{!18}
+!18 = !DILocalVariable(name: "S", scope: !14, file: !3, line: 10, type: !19)
+!19 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "LargeStruct", file: !3, line: 2, size: 224, flags: DIFlagTypePassByValue, elements: !20, identifier: "_ZTS11LargeStruct")
+!20 = !{!21, !22, !23, !24, !25, !26, !27}
+!21 = !DIDerivedType(tag: DW_TAG_member, name: "A", scope: !19, file: !3, line: 3, baseType: !9, size: 32)
+!22 = !DIDerivedType(tag: DW_TAG_member, name: "B", scope: !19, file: !3, line: 3, baseType: !9, size: 32, offset: 32)
+!23 = !DIDerivedType(tag: DW_TAG_member, name: "C", scope: !19, file: !3, line: 3, baseType: !9, size: 32, offset: 64)
+!24 = !DIDerivedType(tag: DW_TAG_member, name: "Var", scope: !19, file: !3, line: 4, baseType: !9, size: 32, offset: 96)
+!25 = !DIDerivedType(tag: DW_TAG_member, name: "D", scope: !19, file: !3, line: 5, baseType: !9, size: 32, offset: 128)
+!26 = !DIDerivedType(tag: DW_TAG_member, name: "E", scope: !19, file: !3, line: 5, baseType: !9, size: 32, offset: 160)
+!27 = !DIDerivedType(tag: DW_TAG_member, name: "F", scope: !19, file: !3, line: 5, baseType: !9, size: 32, offset: 192)
+!28 = distinct !DIAssignID()
+!29 = !DILocation(line: 0, scope: !14)
+!30 = !DILocation(line: 10, column: 3, scope: !14)
+!31 = !DILocation(line: 10, column: 15, scope: !14)
+!32 = distinct !DIAssignID()
+!33 = !DILocation(line: 11, column: 11, scope: !14)
+!38 = !DILocation(line: 11, column: 5, scope: !14)
+!39 = !DILocation(line: 11, column: 9, scope: !14)
+!42 = distinct !DIAssignID()
+!43 = !DILocation(line: 12, column: 12, scope: !14)
+!44 = !DILocation(line: 13, column: 1, scope: !14)
+!45 = !DILocation(line: 12, column: 3, scope: !14)
diff --git a/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/store.ll b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/store.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/store.ll
@@ -0,0 +1,150 @@
+; RUN: opt -passes=sroa,verify -S %s -o - -experimental-assignment-tracking \
+; RUN: | FileCheck %s --implicit-check-not="call void @llvm.dbg"
+
+; Check that the new slices of an alloca and memset intructions get dbg.assign
+; intrinsics with the correct fragment info. Ensure that only the
+; value-expression gets fragment info; that the address-expression remains
+; untouched.
+
+;; $ cat test.cpp
+;; void do_something();
+;; struct LargeStruct {
+;;   int A, B, C;
+;;   int Var;
+;;   int D, E, F;
+;; };
+;; int Glob;
+;; bool Cond;
+;; int use(LargeStruct);
+;; int example() {
+;;   LargeStruct S = {0};
+;;   S.Var = Glob;
+;;   use(S);
+;;   return S.Var;
+;; }
+;; $ clang test.cpp -Xclang -disable-llvm-passes -O2 -g -c -S -emit-llvm -o - \
+;;   | opt -passes=declare-to-assign -S -o -
+
+; CHECK: entry:
+; CHECK-NEXT:   %S.sroa.0 = alloca { i32, i32, i32 }, align 8, !DIAssignID ![[ID_1:[0-9]+]]
+; CHECK-NEXT:   call void @llvm.dbg.assign(metadata i1 undef, metadata ![[VAR:[0-9]+]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 96), metadata ![[ID_1]], metadata ptr %S.sroa.0, metadata !DIExpression()), !dbg
+
+; CHECK-NEXT:   %S.sroa.6 = alloca { i32, i32, i32 }, align 8, !DIAssignID ![[ID_3:[0-9]+]]
+; CHECK-NEXT:   call void @llvm.dbg.assign(metadata i1 undef, metadata ![[VAR]], metadata !DIExpression(DW_OP_LLVM_fragment, 128, 96), metadata ![[ID_3]], metadata ptr %S.sroa.6, metadata !DIExpression()), !dbg
+
+;; The memset has been split into [0, 96)[96, 128)[128, 224) bit slices. The
+;; memset for the middle slice has been removed.
+; CHECK: call void @llvm.memset{{.*}}(ptr align 8 %S.sroa.0, i8 0, i64 12, i1 false), !dbg !{{.+}}, !DIAssignID ![[ID_4:[0-9]+]]
+; CHECK-NEXT: call void @llvm.memset{{.*}}(ptr align 8 %S.sroa.6, i8 0, i64 12, i1 false), !dbg !{{.+}}, !DIAssignID ![[ID_5:[0-9]+]]
+
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i8 0, metadata ![[VAR]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 96), metadata ![[ID_4]], metadata ptr %S.sroa.0, metadata !DIExpression()), !dbg
+;; This is the one we care about most in this test: check that a memset->store
+;; gets a correct dbg.assign.
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i32 0, metadata ![[VAR]], metadata !DIExpression(DW_OP_LLVM_fragment, 96, 32), metadata !{{.+}}, metadata ptr undef, metadata !DIExpression()), !dbg
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i8 0, metadata ![[VAR]], metadata !DIExpression(DW_OP_LLVM_fragment, 128, 96), metadata ![[ID_5]], metadata ptr %S.sroa.6, metadata !DIExpression()), !dbg
+
+;; The load from global+store becomes a load.
+;; FIXME: In reality it is actually stored again later on.
+; CHECK-NEXT: %0 = load i32, ptr @Glob, align 4, !dbg !{{.+}}
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i32 %0, metadata ![[VAR]], metadata !DIExpression(DW_OP_LLVM_fragment, 96, 32), metadata !{{.+}}, metadata ptr undef, metadata !DIExpression()), !dbg !
+
+
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+
+%struct.LargeStruct = type { i32, i32, i32, i32, i32, i32, i32 }
+
+@Glob = dso_local global i32 0, align 4, !dbg !0
+@Cond = dso_local global i8 0, align 1, !dbg !6
+
+; Function Attrs: uwtable mustprogress
+define dso_local i32 @_Z7examplev() #0 !dbg !14 {
+entry:
+  %S = alloca %struct.LargeStruct, align 4, !DIAssignID !28
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !18, metadata !DIExpression(), metadata !28, metadata ptr %S, metadata !DIExpression()), !dbg !29
+  %agg.tmp = alloca %struct.LargeStruct, align 8
+  %0 = bitcast ptr %S to ptr, !dbg !30
+  call void @llvm.lifetime.start.p0i8(i64 28, ptr %0) #5, !dbg !30
+  %1 = bitcast ptr %S to ptr, !dbg !31
+  call void @llvm.memset.p0i8.i64(ptr align 4 %1, i8 0, i64 28, i1 false), !dbg !31, !DIAssignID !32
+  call void @llvm.dbg.assign(metadata i8 0, metadata !18, metadata !DIExpression(), metadata !32, metadata ptr %1, metadata !DIExpression()), !dbg !31
+  %2 = load i32, ptr @Glob, align 4, !dbg !33
+  %Var = getelementptr inbounds %struct.LargeStruct, ptr %S, i32 0, i32 3, !dbg !38
+  store i32 %2, ptr %Var, align 4, !dbg !39, !DIAssignID !42
+  call void @llvm.dbg.assign(metadata i32 %2, metadata !18, metadata !DIExpression(DW_OP_LLVM_fragment, 96, 32), metadata !42, metadata ptr %Var, metadata !DIExpression()), !dbg !39
+  %3 = bitcast ptr %agg.tmp to ptr, !dbg !43
+  %4 = bitcast ptr %S to ptr, !dbg !43
+  call void @llvm.memcpy.p0i8.p0i8.i64(ptr align 4 %3, ptr align 4 %4, i64 28, i1 false), !dbg !43
+  %call = call i32 @_Z3use11LargeStruct(ptr byval(%struct.LargeStruct) align 8 %agg.tmp), !dbg !45
+  %Var1 = getelementptr inbounds %struct.LargeStruct, ptr %S, i32 0, i32 3, !dbg !46
+  %5 = load i32, ptr %Var1, align 4, !dbg !46
+  %6 = bitcast ptr %S to ptr, !dbg !47
+  call void @llvm.lifetime.end.p0i8(i64 28, ptr %6) #5, !dbg !47
+  ret i32 %5, !dbg !48
+}
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.lifetime.start.p0i8(i64 immarg, ptr nocapture) #1
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn writeonly
+declare void @llvm.memset.p0i8.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #2
+
+declare !dbg !49 dso_local i32 @_Z3use11LargeStruct(ptr byval(%struct.LargeStruct) align 8) #3
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.memcpy.p0i8.p0i8.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #1
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.lifetime.end.p0i8(i64 immarg, ptr nocapture) #1
+
+; Function Attrs: nofree nosync nounwind readnone speculatable willreturn
+declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #4
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!10, !11, !12}
+!llvm.ident = !{!13}
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "Glob", scope: !2, file: !3, line: 7, type: !9, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !3, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
+!3 = !DIFile(filename: "test.cpp", directory: "/")
+!4 = !{}
+!5 = !{!0, !6}
+!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
+!7 = distinct !DIGlobalVariable(name: "Cond", scope: !2, file: !3, line: 8, type: !8, isLocal: false, isDefinition: true)
+!8 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean)
+!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!10 = !{i32 7, !"Dwarf Version", i32 4}
+!11 = !{i32 2, !"Debug Info Version", i32 3}
+!12 = !{i32 1, !"wchar_size", i32 4}
+!13 = !{!"clang version 12.0.0"}
+!14 = distinct !DISubprogram(name: "example", linkageName: "_Z7examplev", scope: !3, file: !3, line: 10, type: !15, scopeLine: 10, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !17)
+!15 = !DISubroutineType(types: !16)
+!16 = !{!9}
+!17 = !{!18}
+!18 = !DILocalVariable(name: "S", scope: !14, file: !3, line: 11, type: !19)
+!19 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "LargeStruct", file: !3, line: 2, size: 224, flags: DIFlagTypePassByValue, elements: !20, identifier: "_ZTS11LargeStruct")
+!20 = !{!21, !22, !23, !24, !25, !26, !27}
+!21 = !DIDerivedType(tag: DW_TAG_member, name: "A", scope: !19, file: !3, line: 3, baseType: !9, size: 32)
+!22 = !DIDerivedType(tag: DW_TAG_member, name: "B", scope: !19, file: !3, line: 3, baseType: !9, size: 32, offset: 32)
+!23 = !DIDerivedType(tag: DW_TAG_member, name: "C", scope: !19, file: !3, line: 3, baseType: !9, size: 32, offset: 64)
+!24 = !DIDerivedType(tag: DW_TAG_member, name: "Var", scope: !19, file: !3, line: 4, baseType: !9, size: 32, offset: 96)
+!25 = !DIDerivedType(tag: DW_TAG_member, name: "D", scope: !19, file: !3, line: 5, baseType: !9, size: 32, offset: 128)
+!26 = !DIDerivedType(tag: DW_TAG_member, name: "E", scope: !19, file: !3, line: 5, baseType: !9, size: 32, offset: 160)
+!27 = !DIDerivedType(tag: DW_TAG_member, name: "F", scope: !19, file: !3, line: 5, baseType: !9, size: 32, offset: 192)
+!28 = distinct !DIAssignID()
+!29 = !DILocation(line: 0, scope: !14)
+!30 = !DILocation(line: 11, column: 3, scope: !14)
+!31 = !DILocation(line: 11, column: 15, scope: !14)
+!32 = distinct !DIAssignID()
+!33 = !DILocation(line: 12, column: 11, scope: !14)
+!38 = !DILocation(line: 12, column: 5, scope: !14)
+!39 = !DILocation(line: 12, column: 9, scope: !14)
+!42 = distinct !DIAssignID()
+!43 = !DILocation(line: 13, column: 7, scope: !14)
+!45 = !DILocation(line: 13, column: 3, scope: !14)
+!46 = !DILocation(line: 14, column: 12, scope: !14)
+!47 = !DILocation(line: 15, column: 1, scope: !14)
+!48 = !DILocation(line: 14, column: 3, scope: !14)
+!49 = !DISubprogram(name: "use", linkageName: "_Z3use11LargeStruct", scope: !3, file: !3, line: 9, type: !50, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !4)
+!50 = !DISubroutineType(types: !51)
+!51 = !{!9, !19}
diff --git a/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/unspecified-var-size.ll b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/unspecified-var-size.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/unspecified-var-size.ll
@@ -0,0 +1,54 @@
+; RUN: opt -S %s -passes=sroa -o - -experimental-assignment-tracking | FileCheck %s
+
+;; $ cat test.cpp
+;; #include <cstddef>
+;; void fun(std::nullptr_t) {}
+;;
+;; Check that migrateDebugInfo doesn't crash when encountering an alloca for a
+;; variable with a type of unspecified size (e.g. DW_TAG_unspecified_type).
+
+; CHECK: @llvm.dbg.assign(metadata ptr %0,{{.+}}, metadata !DIExpression(),{{.+}}, metadata ptr undef, {{.+}})
+;; There should be no new fragment and the value component should remain as %0.
+
+define dso_local void @_Z3funDn(ptr %0) #0 !dbg !14 {
+entry:
+  %.addr = alloca i8*, align 8, !DIAssignID !22
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !21, metadata !DIExpression(), metadata !22, metadata ptr %.addr, metadata !DIExpression()), !dbg !23
+  store ptr %0, ptr %.addr, align 8, !DIAssignID !28
+  call void @llvm.dbg.assign(metadata ptr %0, metadata !21, metadata !DIExpression(), metadata !28, metadata ptr %.addr, metadata !DIExpression()), !dbg !23
+  ret void, !dbg !29
+}
+
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
+declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #1
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!10, !11, !12}
+!llvm.ident = !{!13}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, imports: !3, splitDebugInlining: false, nameTableKind: None)
+!1 = !DIFile(filename: "test.cpp", directory: "/")
+!2 = !{}
+!3 = !{!4}
+!4 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !6, file: !9, line: 56)
+!5 = !DINamespace(name: "std", scope: null)
+!6 = !DIDerivedType(tag: DW_TAG_typedef, name: "max_align_t", file: !7, line: 24, baseType: !8)
+!7 = !DIFile(filename: "clang/12.0.0/include/__stddef_max_align_t.h", directory: "/")
+!8 = !DICompositeType(tag: DW_TAG_structure_type, file: !7, line: 19, size: 256, flags: DIFlagFwdDecl, identifier: "_ZTS11max_align_t")
+!9 = !DIFile(filename: "include/c++/7.5.0/cstddef", directory: "")
+!10 = !{i32 7, !"Dwarf Version", i32 4}
+!11 = !{i32 2, !"Debug Info Version", i32 3}
+!12 = !{i32 1, !"wchar_size", i32 4}
+!13 = !{!"clang version 12.0.0"}
+!14 = distinct !DISubprogram(name: "fun", linkageName: "_Z3funDn", scope: !1, file: !1, line: 20, type: !15, scopeLine: 20, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !20)
+!15 = !DISubroutineType(types: !16)
+!16 = !{null, !17}
+!17 = !DIDerivedType(tag: DW_TAG_typedef, name: "nullptr_t", scope: !5, file: !18, line: 235, baseType: !19)
+!18 = !DIFile(filename: "include/x86_64-linux-gnu/c++/7.5.0/bits/c++config.h", directory: "")
+!19 = !DIBasicType(tag: DW_TAG_unspecified_type, name: "decltype(nullptr)")
+!20 = !{!21}
+!21 = !DILocalVariable(arg: 1, scope: !14, file: !1, line: 20, type: !17)
+!22 = distinct !DIAssignID()
+!23 = !DILocation(line: 0, scope: !14)
+!28 = distinct !DIAssignID()
+!29 = !DILocation(line: 20, column: 27, scope: !14)
diff --git a/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/user-memcpy.ll b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/user-memcpy.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/user-memcpy.ll
@@ -0,0 +1,235 @@
+; RUN: opt -passes=sroa -S %s -o - -experimental-assignment-tracking \
+; RUN: | FileCheck %s --implicit-check-not="call void @llvm.dbg"
+
+;; Check that the fragments generated in SROA for a split alloca that has a
+;; dbg.assign with non-zero-offset fragment already are correct.  Ensure that
+;; only the value-expression gets fragment info; that the address-expression
+;; remains untouched.
+
+;; $ cat test.cpp
+;; #include <cstring>
+;;
+;; struct V3i { long x, y, z; };
+;; void fun() {
+;;   V3i point = {0, 0, 0};
+;;   point.z = 5000;
+;;   V3i other = {10, 9, 8};
+;;   std::memcpy(&point.y, &other.x, sizeof(long) * 2);
+;; }
+;; $ clang++ -c -O2 -g test.cpp -o - -Xclang -disable-llvm-passes -S -emit-llvm \
+;;   | opt -passes=declare-to-assign -S -o -
+
+; CHECK: entry:
+;; Allocas have been promoted - the linked dbg.assigns have been removed.
+
+;; | V3i point = {0, 0, 0};
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i64 0, metadata ![[point:[0-9]+]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64), metadata !{{.+}}, metadata ptr undef, metadata !DIExpression()), !dbg
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i64 0, metadata ![[point]], metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64), metadata !{{.+}}, metadata ptr undef, metadata !DIExpression()), !dbg
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i64 0, metadata ![[point]], metadata !DIExpression(DW_OP_LLVM_fragment, 128, 64), metadata !{{.+}}, metadata ptr undef, metadata !DIExpression()), !dbg
+
+;; point.z = 5000;
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i64 5000, metadata ![[point]], metadata !DIExpression(DW_OP_LLVM_fragment, 128, 64), metadata !{{.+}}, metadata ptr undef, metadata !DIExpression()), !dbg
+
+;; | V3i other = {10, 9, 8};
+;;   other is global const:
+;;     local.other.x = global.other.x
+;;     local.other.y = global.other.y
+;;     local.other.z = global.other.z
+; CHECK-NEXT: %other.sroa.0.0.copyload = load i64, ptr @__const._Z3funv.other
+; CHECK-NEXT: %other.sroa.4.0.copyload = load i64, ptr getelementptr inbounds (i8, ptr @__const._Z3funv.other, i64 8)
+; CHECK-NEXT: %other.sroa.5.0.copyload = load i64, ptr getelementptr inbounds (i8, ptr @__const._Z3funv.other, i64 16)
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i64 %other.sroa.0.0.copyload, metadata ![[other:[0-9]+]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64), metadata !{{.+}}, metadata ptr undef, metadata !DIExpression()), !dbg
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i64 %other.sroa.4.0.copyload, metadata ![[other]], metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64), metadata !{{.+}}, metadata ptr undef, metadata !DIExpression()), !dbg
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i64 %other.sroa.5.0.copyload, metadata ![[other]], metadata !DIExpression(DW_OP_LLVM_fragment, 128, 64), metadata !{{.+}}, metadata ptr undef, metadata !DIExpression()), !dbg
+
+;; | std::memcpy(&point.y, &other.x, sizeof(long) * 2);
+;;   other is now 3 scalars:
+;;     point.y = other.x
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i64 %other.sroa.0.0.copyload, metadata ![[point]], metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64), metadata !{{.+}}, metadata ptr undef, metadata !DIExpression()), !dbg
+;;
+;;     point.z = other.y
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata i64 %other.sroa.4.0.copyload, metadata ![[point]], metadata !DIExpression(DW_OP_LLVM_fragment, 128, 64), metadata !{{.+}}, metadata ptr undef, metadata !DIExpression()), !dbg
+
+; CHECK: ![[point]] = !DILocalVariable(name: "point",
+; CHECK: ![[other]] = !DILocalVariable(name: "other",
+
+source_filename = "test.cpp"
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+%struct.V3i = type { i64, i64, i64 }
+
+@__const._Z3funv.other = private unnamed_addr constant %struct.V3i { i64 10, i64 9, i64 8 }, align 8
+
+; Function Attrs: nounwind uwtable mustprogress
+define dso_local void @_Z3funv() !dbg !100 {
+entry:
+  %point = alloca %struct.V3i, align 8, !DIAssignID !112
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !104, metadata !DIExpression(), metadata !112, metadata ptr %point, metadata !DIExpression()), !dbg !113
+  %other = alloca %struct.V3i, align 8, !DIAssignID !114
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !111, metadata !DIExpression(), metadata !114, metadata ptr %other, metadata !DIExpression()), !dbg !113
+  %0 = bitcast ptr %point to ptr, !dbg !115
+  call void @llvm.lifetime.start.p0i8(i64 24, ptr %0), !dbg !115
+  %1 = bitcast ptr %point to ptr, !dbg !116
+  call void @llvm.memset.p0i8.i64(ptr align 8 %1, i8 0, i64 24, i1 false), !dbg !116, !DIAssignID !117
+  call void @llvm.dbg.assign(metadata i8 0, metadata !104, metadata !DIExpression(), metadata !117, metadata ptr %1, metadata !DIExpression()), !dbg !116
+  %z = getelementptr inbounds %struct.V3i, ptr %point, i32 0, i32 2, !dbg !118
+  store i64 5000, ptr %z, align 8, !dbg !119, !DIAssignID !125
+  call void @llvm.dbg.assign(metadata i64 5000, metadata !104, metadata !DIExpression(DW_OP_LLVM_fragment, 128, 64), metadata !125, metadata ptr %z, metadata !DIExpression()), !dbg !119
+  %2 = bitcast ptr %other to ptr, !dbg !126
+  call void @llvm.lifetime.start.p0i8(i64 24, ptr %2), !dbg !126
+  %3 = bitcast ptr %other to ptr, !dbg !127
+  call void @llvm.memcpy.p0i8.p0i8.i64(ptr align 8 %3, ptr align 8 bitcast (ptr @__const._Z3funv.other to ptr), i64 24, i1 false), !dbg !127, !DIAssignID !128
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !111, metadata !DIExpression(), metadata !128, metadata ptr %3, metadata !DIExpression()), !dbg !127
+  %y = getelementptr inbounds %struct.V3i, ptr %point, i32 0, i32 1, !dbg !129
+  %4 = bitcast ptr %y to ptr, !dbg !130
+  %x = getelementptr inbounds %struct.V3i, ptr %other, i32 0, i32 0, !dbg !131
+  %5 = bitcast ptr %x to ptr, !dbg !130
+  call void @llvm.memcpy.p0i8.p0i8.i64(ptr align 8 %4, ptr align 8 %5, i64 16, i1 false), !dbg !130, !DIAssignID !132
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !104, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 128), metadata !132, metadata ptr %4, metadata !DIExpression()), !dbg !130
+  %6 = bitcast ptr %other to ptr, !dbg !133
+  call void @llvm.lifetime.end.p0i8(i64 24, ptr %6), !dbg !133
+  %7 = bitcast ptr %point to ptr, !dbg !133
+  call void @llvm.lifetime.end.p0i8(i64 24, ptr %7), !dbg !133
+  ret void, !dbg !133
+}
+
+declare void @llvm.lifetime.start.p0i8(i64 immarg, ptr nocapture)
+declare void @llvm.memset.p0i8.i64(ptr nocapture writeonly, i8, i64, i1 immarg)
+declare void @llvm.memcpy.p0i8.p0i8.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg)
+declare void @llvm.lifetime.end.p0i8(i64 immarg, ptr nocapture)
+declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata)
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!96, !97, !98}
+!llvm.ident = !{!99}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, imports: !3, splitDebugInlining: false, nameTableKind: None)
+!1 = !DIFile(filename: "test.cpp", directory: "/")
+!2 = !{}
+!3 = !{!4, !18, !22, !28, !32, !36, !46, !50, !52, !54, !58, !62, !66, !70, !74, !76, !78, !80, !84, !88, !92, !94}
+!4 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !6, file: !17, line: 75)
+!5 = !DINamespace(name: "std", scope: null)
+!6 = !DISubprogram(name: "memchr", scope: !7, file: !7, line: 90, type: !8, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!7 = !DIFile(filename: "/usr/include/string.h", directory: "")
+!8 = !DISubroutineType(types: !9)
+!9 = !{!10, !11, !13, !14}
+!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
+!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
+!12 = !DIDerivedType(tag: DW_TAG_const_type, baseType: null)
+!13 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!14 = !DIDerivedType(tag: DW_TAG_typedef, name: "size_t", file: !15, line: 46, baseType: !16)
+!15 = !DIFile(filename: "lib/clang/12.0.0/include/stddef.h", directory: "/")
+!16 = !DIBasicType(name: "long unsigned int", size: 64, encoding: DW_ATE_unsigned)
+!17 = !DIFile(filename: "/usr/lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/cstring", directory: "")
+!18 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !19, file: !17, line: 76)
+!19 = !DISubprogram(name: "memcmp", scope: !7, file: !7, line: 63, type: !20, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!20 = !DISubroutineType(types: !21)
+!21 = !{!13, !11, !11, !14}
+!22 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !23, file: !17, line: 77)
+!23 = !DISubprogram(name: "memcpy", scope: !7, file: !7, line: 42, type: !24, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!24 = !DISubroutineType(types: !25)
+!25 = !{!10, !26, !27, !14}
+!26 = !DIDerivedType(tag: DW_TAG_restrict_type, baseType: !10)
+!27 = !DIDerivedType(tag: DW_TAG_restrict_type, baseType: !11)
+!28 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !29, file: !17, line: 78)
+!29 = !DISubprogram(name: "memmove", scope: !7, file: !7, line: 46, type: !30, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!30 = !DISubroutineType(types: !31)
+!31 = !{!10, !10, !11, !14}
+!32 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !33, file: !17, line: 79)
+!33 = !DISubprogram(name: "memset", scope: !7, file: !7, line: 60, type: !34, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!34 = !DISubroutineType(types: !35)
+!35 = !{!10, !10, !13, !14}
+!36 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !37, file: !17, line: 80)
+!37 = !DISubprogram(name: "strcat", scope: !7, file: !7, line: 129, type: !38, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!38 = !DISubroutineType(types: !39)
+!39 = !{!40, !42, !43}
+!40 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !41, size: 64)
+!41 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
+!42 = !DIDerivedType(tag: DW_TAG_restrict_type, baseType: !40)
+!43 = !DIDerivedType(tag: DW_TAG_restrict_type, baseType: !44)
+!44 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !45, size: 64)
+!45 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !41)
+!46 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !47, file: !17, line: 81)
+!47 = !DISubprogram(name: "strcmp", scope: !7, file: !7, line: 136, type: !48, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!48 = !DISubroutineType(types: !49)
+!49 = !{!13, !44, !44}
+!50 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !51, file: !17, line: 82)
+!51 = !DISubprogram(name: "strcoll", scope: !7, file: !7, line: 143, type: !48, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!52 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !53, file: !17, line: 83)
+!53 = !DISubprogram(name: "strcpy", scope: !7, file: !7, line: 121, type: !38, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!54 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !55, file: !17, line: 84)
+!55 = !DISubprogram(name: "strcspn", scope: !7, file: !7, line: 272, type: !56, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!56 = !DISubroutineType(types: !57)
+!57 = !{!14, !44, !44}
+!58 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !59, file: !17, line: 85)
+!59 = !DISubprogram(name: "strerror", scope: !7, file: !7, line: 396, type: !60, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!60 = !DISubroutineType(types: !61)
+!61 = !{!40, !13}
+!62 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !63, file: !17, line: 86)
+!63 = !DISubprogram(name: "strlen", scope: !7, file: !7, line: 384, type: !64, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!64 = !DISubroutineType(types: !65)
+!65 = !{!14, !44}
+!66 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !67, file: !17, line: 87)
+!67 = !DISubprogram(name: "strncat", scope: !7, file: !7, line: 132, type: !68, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!68 = !DISubroutineType(types: !69)
+!69 = !{!40, !42, !43, !14}
+!70 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !71, file: !17, line: 88)
+!71 = !DISubprogram(name: "strncmp", scope: !7, file: !7, line: 139, type: !72, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!72 = !DISubroutineType(types: !73)
+!73 = !{!13, !44, !44, !14}
+!74 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !75, file: !17, line: 89)
+!75 = !DISubprogram(name: "strncpy", scope: !7, file: !7, line: 124, type: !68, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!76 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !77, file: !17, line: 90)
+!77 = !DISubprogram(name: "strspn", scope: !7, file: !7, line: 276, type: !56, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!78 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !79, file: !17, line: 91)
+!79 = !DISubprogram(name: "strtok", scope: !7, file: !7, line: 335, type: !38, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!80 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !81, file: !17, line: 92)
+!81 = !DISubprogram(name: "strxfrm", scope: !7, file: !7, line: 146, type: !82, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!82 = !DISubroutineType(types: !83)
+!83 = !{!14, !42, !43, !14}
+!84 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !85, file: !17, line: 93)
+!85 = !DISubprogram(name: "strchr", scope: !7, file: !7, line: 225, type: !86, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!86 = !DISubroutineType(types: !87)
+!87 = !{!40, !44, !13}
+!88 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !89, file: !17, line: 94)
+!89 = !DISubprogram(name: "strpbrk", scope: !7, file: !7, line: 302, type: !90, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!90 = !DISubroutineType(types: !91)
+!91 = !{!40, !44, !44}
+!92 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !93, file: !17, line: 95)
+!93 = !DISubprogram(name: "strrchr", scope: !7, file: !7, line: 252, type: !86, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!94 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !5, entity: !95, file: !17, line: 96)
+!95 = !DISubprogram(name: "strstr", scope: !7, file: !7, line: 329, type: !90, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!96 = !{i32 7, !"Dwarf Version", i32 4}
+!97 = !{i32 2, !"Debug Info Version", i32 3}
+!98 = !{i32 1, !"wchar_size", i32 4}
+!99 = !{!"clang version 12.0.0"}
+!100 = distinct !DISubprogram(name: "fun", linkageName: "_Z3funv", scope: !1, file: !1, line: 4, type: !101, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !103)
+!101 = !DISubroutineType(types: !102)
+!102 = !{null}
+!103 = !{!104, !111}
+!104 = !DILocalVariable(name: "point", scope: !100, file: !1, line: 5, type: !105)
+!105 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "V3i", file: !1, line: 3, size: 192, flags: DIFlagTypePassByValue, elements: !106, identifier: "_ZTS3V3i")
+!106 = !{!107, !109, !110}
+!107 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !105, file: !1, line: 3, baseType: !108, size: 64)
+!108 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
+!109 = !DIDerivedType(tag: DW_TAG_member, name: "y", scope: !105, file: !1, line: 3, baseType: !108, size: 64, offset: 64)
+!110 = !DIDerivedType(tag: DW_TAG_member, name: "z", scope: !105, file: !1, line: 3, baseType: !108, size: 64, offset: 128)
+!111 = !DILocalVariable(name: "other", scope: !100, file: !1, line: 7, type: !105)
+!112 = distinct !DIAssignID()
+!113 = !DILocation(line: 0, scope: !100)
+!114 = distinct !DIAssignID()
+!115 = !DILocation(line: 5, column: 3, scope: !100)
+!116 = !DILocation(line: 5, column: 7, scope: !100)
+!117 = distinct !DIAssignID()
+!118 = !DILocation(line: 6, column: 9, scope: !100)
+!119 = !DILocation(line: 6, column: 11, scope: !100)
+!125 = distinct !DIAssignID()
+!126 = !DILocation(line: 7, column: 3, scope: !100)
+!127 = !DILocation(line: 7, column: 7, scope: !100)
+!128 = distinct !DIAssignID()
+!129 = !DILocation(line: 8, column: 22, scope: !100)
+!130 = !DILocation(line: 8, column: 3, scope: !100)
+!131 = !DILocation(line: 8, column: 32, scope: !100)
+!132 = distinct !DIAssignID()
+!133 = !DILocation(line: 9, column: 1, scope: !100)
diff --git a/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/vec-1.ll b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/vec-1.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/vec-1.ll
@@ -0,0 +1,104 @@
+; RUN: opt %s -S -passes=sroa -o - -experimental-assignment-tracking | FileCheck %s
+
+;; Ensure that only the value-expression gets fragment info; that the
+;; address-expression remains untouched.
+
+;; $ cat test.cpp
+;; class a {
+;;   float b[4];
+;; };
+;; class c {
+;;   a m_fn1() const;
+;;   void d() const;
+;; };
+;; void c::d() const { a e = m_fn1(); }
+;;
+;; Generated by grabbing IR before sroa in:
+;; $ clang++ -O2 -g -c test.cpp -Xclang  -fexperimental-assignment-tracking
+
+; CHECK: %call = call
+; CHECK-NEXT: %0 = extractvalue { <2 x float>, <2 x float> } %call, 0
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata <2 x float> %0, metadata ![[var:[0-9]+]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64), metadata ![[id1:[0-9]+]],{{.+}} undef, metadata !DIExpression()), !dbg
+; CHECK-NEXT: %1 = extractvalue { <2 x float>, <2 x float> } %call, 1
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata <2 x float> %1, metadata ![[var]], metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64), metadata ![[id2:[0-9]+]], {{.+}} undef, metadata !DIExpression()), !dbg
+
+%class.c = type { i8 }
+%class.a = type { [4 x float] }
+
+; Function Attrs: uwtable
+define dso_local void @_ZNK1c1dEv(ptr %this) #0 align 2 !dbg !7 {
+entry:
+  %this.addr = alloca ptr, align 8, !DIAssignID !29
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !26, metadata !DIExpression(), metadata !29, metadata ptr %this.addr, metadata !DIExpression()), !dbg !30
+  %e = alloca %class.a, align 4, !DIAssignID !31
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !28, metadata !DIExpression(), metadata !31, metadata ptr %e, metadata !DIExpression()), !dbg !30
+  store ptr %this, ptr %this.addr, align 8, !DIAssignID !36
+  call void @llvm.dbg.assign(metadata ptr %this, metadata !26, metadata !DIExpression(), metadata !36, metadata ptr %this.addr, metadata !DIExpression()), !dbg !30
+  %this1 = load ptr, ptr %this.addr, align 8
+  %0 = bitcast ptr %e to ptr, !dbg !37
+  call void @llvm.lifetime.start.p0i8(i64 16, ptr %0) #4, !dbg !37
+  %call = call { <2 x float>, <2 x float> } @_ZNK1c5m_fn1Ev(ptr %this1), !dbg !38
+  %coerce.dive = getelementptr inbounds %class.a, ptr %e, i32 0, i32 0, !dbg !38
+  %1 = bitcast ptr %coerce.dive to ptr, !dbg !38
+  %2 = getelementptr inbounds { <2 x float>, <2 x float> }, ptr %1, i32 0, i32 0, !dbg !38
+  %3 = extractvalue { <2 x float>, <2 x float> } %call, 0, !dbg !38
+  store <2 x float> %3, ptr %2, align 4, !dbg !38, !DIAssignID !39
+  call void @llvm.dbg.assign(metadata <2 x float> %3, metadata !28, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64), metadata !39, metadata ptr %2, metadata !DIExpression()), !dbg !30
+  %4 = getelementptr inbounds { <2 x float>, <2 x float> }, ptr %1, i32 0, i32 1, !dbg !38
+  %5 = extractvalue { <2 x float>, <2 x float> } %call, 1, !dbg !38
+  store <2 x float> %5, ptr %4, align 4, !dbg !38, !DIAssignID !40
+  call void @llvm.dbg.assign(metadata <2 x float> %5, metadata !28, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64), metadata !40, metadata ptr %4, metadata !DIExpression()), !dbg !30
+  %6 = bitcast ptr %e to ptr, !dbg !41
+  call void @llvm.lifetime.end.p0i8(i64 16, ptr %6) #4, !dbg !41
+  ret void, !dbg !41
+}
+
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
+declare void @llvm.lifetime.start.p0i8(i64 immarg, ptr nocapture) #2
+declare dso_local { <2 x float>, <2 x float> } @_ZNK1c5m_fn1Ev(ptr) #3
+declare void @llvm.lifetime.end.p0i8(i64 immarg, ptr nocapture) #2
+declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #1
+
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+!llvm.ident = !{!6}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
+!1 = !DIFile(filename: "test.cpp", directory: "/")
+!2 = !{}
+!3 = !{i32 7, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{!"clang version 12.0.0"}
+!7 = distinct !DISubprogram(name: "d", linkageName: "_ZNK1c1dEv", scope: !8, file: !1, line: 8, type: !23, scopeLine: 8, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, declaration: !22, retainedNodes: !25)
+!8 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "c", file: !1, line: 4, size: 8, flags: DIFlagTypePassByValue, elements: !9, identifier: "_ZTS1c")
+!9 = !{!10, !22}
+!10 = !DISubprogram(name: "m_fn1", linkageName: "_ZNK1c5m_fn1Ev", scope: !8, file: !1, line: 5, type: !11, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!11 = !DISubroutineType(types: !12)
+!12 = !{!13, !20}
+!13 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "a", file: !1, line: 1, size: 128, flags: DIFlagTypePassByValue, elements: !14, identifier: "_ZTS1a")
+!14 = !{!15}
+!15 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !13, file: !1, line: 2, baseType: !16, size: 128)
+!16 = !DICompositeType(tag: DW_TAG_array_type, baseType: !17, size: 128, elements: !18)
+!17 = !DIBasicType(name: "float", size: 32, encoding: DW_ATE_float)
+!18 = !{!19}
+!19 = !DISubrange(count: 4)
+!20 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !21, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!21 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !8)
+!22 = !DISubprogram(name: "d", linkageName: "_ZNK1c1dEv", scope: !8, file: !1, line: 6, type: !23, scopeLine: 6, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!23 = !DISubroutineType(types: !24)
+!24 = !{null, !20}
+!25 = !{!26, !28}
+!26 = !DILocalVariable(name: "this", arg: 1, scope: !7, type: !27, flags: DIFlagArtificial | DIFlagObjectPointer)
+!27 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !21, size: 64)
+!28 = !DILocalVariable(name: "e", scope: !7, file: !1, line: 8, type: !13)
+!29 = distinct !DIAssignID()
+!30 = !DILocation(line: 0, scope: !7)
+!31 = distinct !DIAssignID()
+!36 = distinct !DIAssignID()
+!37 = !DILocation(line: 8, column: 21, scope: !7)
+!38 = !DILocation(line: 8, column: 27, scope: !7)
+!39 = distinct !DIAssignID()
+!40 = distinct !DIAssignID()
+!41 = !DILocation(line: 8, column: 36, scope: !7)
diff --git a/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/vec-2.ll b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/vec-2.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/vec-2.ll
@@ -0,0 +1,206 @@
+; RUN: opt %s -S -passes=sroa -o - -experimental-assignment-tracking | FileCheck %s
+
+;; $ cat test.cpp
+;; class a {
+;; protected:
+;;   float b[4];
+;; };
+;; float c;
+;; class d : a {
+;; public:
+;;   d() { b[3] = c; }
+;;   void e() {}
+;; };
+;; d f();
+;; void g() {
+;;   d j = f(), h = j, i = h;
+;;   i.e();
+;;   i = d();
+;; }
+;;
+;; Generated by grabbing IR before sroa in:
+;; $ clang++ -O2 -g -c test.cpp -Xclang -fexperimental-assignment-tracking
+
+;; Check that the dbg.assign value is scalar rather than a vector value because
+;; we don't have a way of indexing a vector from within a
+;; dbg.assign/DIExpression. Ensure that only the value-expression gets fragment
+;; info; that the address-expression remains untouched.
+
+; CHECK: %i.sroa.4.12.vec.insert = insertelement <2 x float> %i.sroa.4.0.vec.insert, float %2, i32 1, !dbg
+;; There's a few dbg intrinsics we're not interested in testing wedged in here.
+; CHECK-NEXT: dbg.value
+; CHECK-NEXT: dbg.assign
+; CHECK-NEXT: dbg.assign
+; CHECK-NEXT: call void @llvm.dbg.assign(metadata float %2,{{.+}}, metadata !DIExpression(DW_OP_LLVM_fragment, 96, 32),{{.+}}, metadata ptr undef, metadata !DIExpression()), !dbg
+
+%class.d = type { %class.a }
+%class.a = type { [4 x float] }
+
+$_ZN1d1eEv = comdat any
+
+$_ZN1dC2Ev = comdat any
+
+@c = dso_local local_unnamed_addr global float 0.000000e+00, align 4, !dbg !0
+
+; Function Attrs: uwtable
+define dso_local void @_Z1gv() local_unnamed_addr #0 !dbg !11 {
+entry:
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !15, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64), metadata !32, metadata ptr undef, metadata !DIExpression()), !dbg !33
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !15, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64), metadata !34, metadata ptr undef, metadata !DIExpression()), !dbg !33
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !30, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64), metadata !35, metadata ptr undef, metadata !DIExpression()), !dbg !33
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !30, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64), metadata !36, metadata ptr undef, metadata !DIExpression()), !dbg !33
+  %i = alloca %class.d, align 8, !DIAssignID !37
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !31, metadata !DIExpression(), metadata !37, metadata ptr %i, metadata !DIExpression()), !dbg !33
+  %ref.tmp = alloca %class.d, align 4
+  %call = call { <2 x float>, <2 x float> } @_Z1fv(), !dbg !38
+  %0 = extractvalue { <2 x float>, <2 x float> } %call, 0, !dbg !38
+  call void @llvm.dbg.assign(metadata <2 x float> %0, metadata !15, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64), metadata !39, metadata ptr undef, metadata !DIExpression()), !dbg !33
+  %1 = extractvalue { <2 x float>, <2 x float> } %call, 1, !dbg !38
+  call void @llvm.dbg.assign(metadata <2 x float> %1, metadata !15, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64), metadata !40, metadata ptr undef, metadata !DIExpression()), !dbg !33
+  call void @llvm.dbg.assign(metadata <2 x float> %0, metadata !30, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64), metadata !41, metadata ptr undef, metadata !DIExpression()), !dbg !33
+  call void @llvm.dbg.assign(metadata <2 x float> %1, metadata !30, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64), metadata !42, metadata ptr undef, metadata !DIExpression()), !dbg !33
+  %2 = bitcast ptr %i to ptr, !dbg !43
+  call void @llvm.lifetime.start.p0i8(i64 16, ptr nonnull %2) #5, !dbg !43
+  %h.sroa.0.sroa.0.0.h.sroa.0.0..sroa_cast4.sroa_cast = bitcast ptr %i to ptr, !dbg !44
+  store <2 x float> %0, ptr %h.sroa.0.sroa.0.0.h.sroa.0.0..sroa_cast4.sroa_cast, align 8, !dbg !44, !DIAssignID !45
+  call void @llvm.dbg.assign(metadata <2 x float> %0, metadata !31, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64), metadata !45, metadata ptr %h.sroa.0.sroa.0.0.h.sroa.0.0..sroa_cast4.sroa_cast, metadata !DIExpression()), !dbg !33
+  %h.sroa.0.sroa.4.0.h.sroa.0.0..sroa_cast4.sroa_idx13 = getelementptr inbounds %class.d, ptr %i, i64 0, i32 0, i32 0, i64 2, !dbg !44
+  %h.sroa.0.sroa.4.0.h.sroa.0.0..sroa_cast4.sroa_cast = bitcast ptr %h.sroa.0.sroa.4.0.h.sroa.0.0..sroa_cast4.sroa_idx13 to ptr, !dbg !44
+  store <2 x float> %1, ptr %h.sroa.0.sroa.4.0.h.sroa.0.0..sroa_cast4.sroa_cast, align 8, !dbg !44, !DIAssignID !46
+  call void @llvm.dbg.assign(metadata <2 x float> %1, metadata !31, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64), metadata !46, metadata ptr %h.sroa.0.sroa.4.0.h.sroa.0.0..sroa_cast4.sroa_cast, metadata !DIExpression()), !dbg !33
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !47, metadata !DIExpression(), metadata !51, metadata ptr undef, metadata !DIExpression()), !dbg !52
+  call void @llvm.dbg.assign(metadata ptr %i, metadata !47, metadata !DIExpression(), metadata !54, metadata ptr undef, metadata !DIExpression()), !dbg !52
+  %3 = bitcast ptr %ref.tmp to ptr, !dbg !55
+  call void @llvm.lifetime.start.p0i8(i64 16, ptr nonnull %3) #5, !dbg !55
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !56, metadata !DIExpression(), metadata !59, metadata ptr undef, metadata !DIExpression()), !dbg !60
+  call void @llvm.dbg.assign(metadata ptr %ref.tmp, metadata !56, metadata !DIExpression(), metadata !62, metadata ptr undef, metadata !DIExpression()), !dbg !60
+  %4 = load float, ptr @c, align 4, !dbg !63
+  %arrayidx.i = getelementptr inbounds %class.d, ptr %ref.tmp, i64 0, i32 0, i32 0, i64 3, !dbg !69
+  store float %4, ptr %arrayidx.i, align 4, !dbg !70
+  call void @llvm.memcpy.p0i8.p0i8.i64(ptr nonnull align 8 dereferenceable(16) %2, ptr nonnull align 4 dereferenceable(16) %3, i64 16, i1 false), !dbg !71, !DIAssignID !72
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !31, metadata !DIExpression(), metadata !72, metadata ptr %2, metadata !DIExpression()), !dbg !33
+  call void @llvm.lifetime.end.p0i8(i64 16, ptr nonnull %3) #5, !dbg !73
+  call void @llvm.lifetime.end.p0i8(i64 16, ptr nonnull %2) #5, !dbg !74
+  ret void, !dbg !74
+}
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.lifetime.start.p0i8(i64 immarg, ptr nocapture) #1
+
+declare !dbg !75 dso_local { <2 x float>, <2 x float> } @_Z1fv() local_unnamed_addr #2
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.memcpy.p0i8.p0i8.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #1
+
+; Function Attrs: nounwind uwtable
+define linkonce_odr dso_local void @_ZN1d1eEv(ptr %this) local_unnamed_addr #3 comdat align 2 !dbg !48 {
+entry:
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !47, metadata !DIExpression(), metadata !78, metadata ptr undef, metadata !DIExpression()), !dbg !79
+  call void @llvm.dbg.assign(metadata ptr %this, metadata !47, metadata !DIExpression(), metadata !80, metadata ptr undef, metadata !DIExpression()), !dbg !79
+  ret void, !dbg !81
+}
+
+; Function Attrs: nounwind uwtable
+define linkonce_odr dso_local void @_ZN1dC2Ev(ptr %this) unnamed_addr #3 comdat align 2 !dbg !57 {
+entry:
+  call void @llvm.dbg.assign(metadata i1 undef, metadata !56, metadata !DIExpression(), metadata !82, metadata ptr undef, metadata !DIExpression()), !dbg !83
+  call void @llvm.dbg.assign(metadata ptr %this, metadata !56, metadata !DIExpression(), metadata !84, metadata ptr undef, metadata !DIExpression()), !dbg !83
+  %0 = load float, ptr @c, align 4, !dbg !85
+  %arrayidx = getelementptr inbounds %class.d, ptr %this, i64 0, i32 0, i32 0, i64 3, !dbg !86
+  store float %0, ptr %arrayidx, align 4, !dbg !87
+  ret void, !dbg !88
+}
+
+declare void @llvm.lifetime.end.p0i8(i64 immarg, ptr nocapture) #1
+declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #4
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!7, !8, !9}
+!llvm.ident = !{!10}
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "c", scope: !2, file: !3, line: 5, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
+!3 = !DIFile(filename: "test.cpp", directory: "/")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIBasicType(name: "float", size: 32, encoding: DW_ATE_float)
+!7 = !{i32 7, !"Dwarf Version", i32 4}
+!8 = !{i32 2, !"Debug Info Version", i32 3}
+!9 = !{i32 1, !"wchar_size", i32 4}
+!10 = !{!"clang version 12.0.0"}
+!11 = distinct !DISubprogram(name: "g", linkageName: "_Z1gv", scope: !3, file: !3, line: 12, type: !12, scopeLine: 12, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !14)
+!12 = !DISubroutineType(types: !13)
+!13 = !{null}
+!14 = !{!15, !30, !31}
+!15 = !DILocalVariable(name: "j", scope: !11, file: !3, line: 13, type: !16)
+!16 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "d", file: !3, line: 6, size: 128, flags: DIFlagTypePassByValue | DIFlagNonTrivial, elements: !17, identifier: "_ZTS1d")
+!17 = !{!18, !25, !29}
+!18 = !DIDerivedType(tag: DW_TAG_inheritance, scope: !16, baseType: !19, extraData: i32 0)
+!19 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "a", file: !3, line: 1, size: 128, flags: DIFlagTypePassByValue, elements: !20, identifier: "_ZTS1a")
+!20 = !{!21}
+!21 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !19, file: !3, line: 3, baseType: !22, size: 128, flags: DIFlagProtected)
+!22 = !DICompositeType(tag: DW_TAG_array_type, baseType: !6, size: 128, elements: !23)
+!23 = !{!24}
+!24 = !DISubrange(count: 4)
+!25 = !DISubprogram(name: "d", scope: !16, file: !3, line: 8, type: !26, scopeLine: 8, flags: DIFlagPublic | DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!26 = !DISubroutineType(types: !27)
+!27 = !{null, !28}
+!28 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !16, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!29 = !DISubprogram(name: "e", linkageName: "_ZN1d1eEv", scope: !16, file: !3, line: 9, type: !26, scopeLine: 9, flags: DIFlagPublic | DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!30 = !DILocalVariable(name: "h", scope: !11, file: !3, line: 13, type: !16)
+!31 = !DILocalVariable(name: "i", scope: !11, file: !3, line: 13, type: !16)
+!32 = distinct !DIAssignID()
+!33 = !DILocation(line: 0, scope: !11)
+!34 = distinct !DIAssignID()
+!35 = distinct !DIAssignID()
+!36 = distinct !DIAssignID()
+!37 = distinct !DIAssignID()
+!38 = !DILocation(line: 13, column: 9, scope: !11)
+!39 = distinct !DIAssignID()
+!40 = distinct !DIAssignID()
+!41 = distinct !DIAssignID()
+!42 = distinct !DIAssignID()
+!43 = !DILocation(line: 13, column: 3, scope: !11)
+!44 = !DILocation(line: 13, column: 25, scope: !11)
+!45 = distinct !DIAssignID()
+!46 = distinct !DIAssignID()
+!47 = !DILocalVariable(name: "this", arg: 1, scope: !48, type: !50, flags: DIFlagArtificial | DIFlagObjectPointer)
+!48 = distinct !DISubprogram(name: "e", linkageName: "_ZN1d1eEv", scope: !16, file: !3, line: 9, type: !26, scopeLine: 9, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, declaration: !29, retainedNodes: !49)
+!49 = !{!47}
+!50 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !16, size: 64)
+!51 = distinct !DIAssignID()
+!52 = !DILocation(line: 0, scope: !48, inlinedAt: !53)
+!53 = distinct !DILocation(line: 14, column: 5, scope: !11)
+!54 = distinct !DIAssignID()
+!55 = !DILocation(line: 15, column: 7, scope: !11)
+!56 = !DILocalVariable(name: "this", arg: 1, scope: !57, type: !50, flags: DIFlagArtificial | DIFlagObjectPointer)
+!57 = distinct !DISubprogram(name: "d", linkageName: "_ZN1dC2Ev", scope: !16, file: !3, line: 8, type: !26, scopeLine: 8, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, declaration: !25, retainedNodes: !58)
+!58 = !{!56}
+!59 = distinct !DIAssignID()
+!60 = !DILocation(line: 0, scope: !57, inlinedAt: !61)
+!61 = distinct !DILocation(line: 15, column: 7, scope: !11)
+!62 = distinct !DIAssignID()
+!63 = !DILocation(line: 8, column: 16, scope: !64, inlinedAt: !61)
+!64 = distinct !DILexicalBlock(scope: !57, file: !3, line: 8, column: 7)
+!69 = !DILocation(line: 8, column: 9, scope: !64, inlinedAt: !61)
+!70 = !DILocation(line: 8, column: 14, scope: !64, inlinedAt: !61)
+!71 = !DILocation(line: 15, column: 5, scope: !11)
+!72 = distinct !DIAssignID()
+!73 = !DILocation(line: 15, column: 3, scope: !11)
+!74 = !DILocation(line: 16, column: 1, scope: !11)
+!75 = !DISubprogram(name: "f", linkageName: "_Z1fv", scope: !3, file: !3, line: 11, type: !76, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !4)
+!76 = !DISubroutineType(types: !77)
+!77 = !{!16}
+!78 = distinct !DIAssignID()
+!79 = !DILocation(line: 0, scope: !48)
+!80 = distinct !DIAssignID()
+!81 = !DILocation(line: 9, column: 13, scope: !48)
+!82 = distinct !DIAssignID()
+!83 = !DILocation(line: 0, scope: !57)
+!84 = distinct !DIAssignID()
+!85 = !DILocation(line: 8, column: 16, scope: !64)
+!86 = !DILocation(line: 8, column: 9, scope: !64)
+!87 = !DILocation(line: 8, column: 14, scope: !64)
+!88 = !DILocation(line: 8, column: 19, scope: !57)
+