diff --git a/llvm/include/llvm/CodeGen/TargetLowering.h b/llvm/include/llvm/CodeGen/TargetLowering.h
--- a/llvm/include/llvm/CodeGen/TargetLowering.h
+++ b/llvm/include/llvm/CodeGen/TargetLowering.h
@@ -287,8 +287,8 @@
     bool IsSwiftError : 1;
     bool IsCFGuardTarget : 1;
     MaybeAlign Alignment = None;
-    Type *ByValType = nullptr;
-    Type *PreallocatedType = nullptr;
+    // Type for byval, inalloca, or preallocated.
+    Type *IndirectType = nullptr;
 
     ArgListEntry()
         : IsSExt(false), IsZExt(false), IsInReg(false), IsSRet(false),
diff --git a/llvm/include/llvm/IR/InstrTypes.h b/llvm/include/llvm/IR/InstrTypes.h
--- a/llvm/include/llvm/IR/InstrTypes.h
+++ b/llvm/include/llvm/IR/InstrTypes.h
@@ -1737,14 +1737,17 @@
 
   /// Extract the byval type for a call or parameter.
   Type *getParamByValType(unsigned ArgNo) const {
-    Type *Ty = Attrs.getParamByValType(ArgNo);
-    return Ty ? Ty : getArgOperand(ArgNo)->getType()->getPointerElementType();
+    return Attrs.getParamByValType(ArgNo);
+  }
+
+  /// Extract the inalloca type for a call or parameter.
+  Type *getParamInAllocaType(unsigned ArgNo) const {
+    return Attrs.getParamInAllocaType(ArgNo);
   }
 
   /// Extract the preallocated type for a call or parameter.
   Type *getParamPreallocatedType(unsigned ArgNo) const {
-    Type *Ty = Attrs.getParamPreallocatedType(ArgNo);
-    return Ty ? Ty : getArgOperand(ArgNo)->getType()->getPointerElementType();
+    return Attrs.getParamPreallocatedType(ArgNo);
   }
 
   /// Extract the number of dereferenceable bytes for a call or
diff --git a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
--- a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -1033,7 +1033,7 @@
   for (auto &Arg : CLI.getArgs()) {
     Type *FinalType = Arg.Ty;
     if (Arg.IsByVal)
-      FinalType = cast<PointerType>(Arg.Ty)->getElementType();
+      FinalType = Arg.IndirectType;
     bool NeedsRegBlock = TLI.functionArgumentNeedsConsecutiveRegisters(
         FinalType, CLI.CallConv, CLI.IsVarArg);
 
@@ -1074,10 +1074,10 @@
     }
     MaybeAlign MemAlign = Arg.Alignment;
     if (Arg.IsByVal || Arg.IsInAlloca || Arg.IsPreallocated) {
-      PointerType *Ty = cast<PointerType>(Arg.Ty);
-      Type *ElementTy = Ty->getElementType();
-      unsigned FrameSize =
-          DL.getTypeAllocSize(Arg.ByValType ? Arg.ByValType : ElementTy);
+      Type *ElementTy = Arg.IndirectType;
+      assert(ElementTy && "Indirect type not set in ArgListEntry");
+
+      unsigned FrameSize = DL.getTypeAllocSize(ElementTy);
 
       // For ByVal, alignment should come from FE. BE will guess if this info
       // is not there, but there are cases it cannot get right.
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -9410,7 +9410,7 @@
     // FIXME: Split arguments if CLI.IsPostTypeLegalization
     Type *FinalType = Args[i].Ty;
     if (Args[i].IsByVal)
-      FinalType = cast<PointerType>(Args[i].Ty)->getElementType();
+      FinalType = Args[i].IndirectType;
     bool NeedsRegBlock = functionArgumentNeedsConsecutiveRegisters(
         FinalType, CLI.CallConv, CLI.IsVarArg);
     for (unsigned Value = 0, NumValues = ValueVTs.size(); Value != NumValues;
@@ -9481,11 +9481,10 @@
       }
       Align MemAlign;
       if (Args[i].IsByVal || Args[i].IsInAlloca || Args[i].IsPreallocated) {
-        PointerType *Ty = cast<PointerType>(Args[i].Ty);
-        Type *ElementTy = Ty->getElementType();
+        Type *ElementTy = Args[i].IndirectType;
+        assert(ElementTy && "Indirect type not set in ArgListEntry");
 
-        unsigned FrameSize = DL.getTypeAllocSize(
-            Args[i].ByValType ? Args[i].ByValType : ElementTy);
+        unsigned FrameSize = DL.getTypeAllocSize(ElementTy);
         Flags.setByValSize(FrameSize);
 
         // info is not there but there are cases it cannot get right.
diff --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
--- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -118,15 +118,23 @@
   IsSwiftSelf = Call->paramHasAttr(ArgIdx, Attribute::SwiftSelf);
   IsSwiftError = Call->paramHasAttr(ArgIdx, Attribute::SwiftError);
   Alignment = Call->getParamStackAlign(ArgIdx);
-  ByValType = nullptr;
+  assert(IsByVal + IsInAlloca + IsPreallocated <= 1 &&
+         "can't have multiple indirect attributes");
+  IndirectType = nullptr;
   if (IsByVal) {
-    ByValType = Call->getParamByValType(ArgIdx);
+    IndirectType = Call->getParamByValType(ArgIdx);
+    assert(IndirectType && "no byval type?");
     if (!Alignment)
       Alignment = Call->getParamAlign(ArgIdx);
   }
-  PreallocatedType = nullptr;
-  if (IsPreallocated)
-    PreallocatedType = Call->getParamPreallocatedType(ArgIdx);
+  if (IsInAlloca) {
+    IndirectType = Call->getParamInAllocaType(ArgIdx);
+    assert(IndirectType && "no inalloca type?");
+  }
+  if (IsPreallocated) {
+    IndirectType = Call->getParamPreallocatedType(ArgIdx);
+    assert(IndirectType && "no preallocated type?");
+  }
 }
 
 /// Generate a libcall taking the given operands as arguments and returning a