diff --git a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
--- a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -272,6 +272,7 @@
                                              IRBuilder<> &Builder);
 
   bool HoistThenElseCodeToIf(BranchInst *BI, bool EqTermsOnly);
+  bool hoistCommonInstsOnSwitch(SwitchInst *SI);
   bool SpeculativelyExecuteBB(BranchInst *BI, BasicBlock *ThenBB);
   bool SimplifyTerminatorOnSelect(Instruction *OldTerm, Value *Cond,
                                   BasicBlock *TrueBB, BasicBlock *FalseBB,
@@ -1748,6 +1749,74 @@
   return Changed;
 }
 
+/// Similar to HoistThenElseCodeToIf, but simpler. We don't care about
+/// instruction reordering and debugging instructions.
+bool SimplifyCFGOpt::hoistCommonInstsOnSwitch(SwitchInst *SI) {
+  unsigned NumSuccs = SI->getNumSuccessors();
+  if (NumSuccs < 2) {
+    return false;
+  }
+  auto *BB1 = SI->getSuccessor(0);
+  if (BB1->hasAddressTaken() || !BB1->getSinglePredecessor()) {
+    return false;
+  }
+
+  BasicBlock::iterator BB1Itr = BB1->begin();
+
+  Instruction *I1 = &*BB1Itr++;
+  if (isa<PHINode>(I1))
+    return false;
+
+  BasicBlock *BIParent = SI->getParent();
+
+  bool Changed = false;
+
+  auto _ = make_scope_exit([&]() {
+    if (Changed)
+      NumHoistCommonCode += NumSuccs;
+  });
+
+  SmallVector<BasicBlock::iterator, 8> OtherSuccIters;
+  OtherSuccIters.reserve(NumSuccs - 1);
+
+  for (unsigned Idx = 1; Idx < NumSuccs; ++Idx) {
+    auto *Succ = SI->getSuccessor(Idx);
+    if (Succ->hasAddressTaken() || !Succ->getSinglePredecessor()) {
+      return false;
+    }
+    BasicBlock::iterator SuccItr = Succ->begin();
+    OtherSuccIters.push_back(SuccItr);
+  }
+
+  for (;;) {
+    // We expect simplifyUncondBranch to complete the optimization of the
+    // termination instruction.
+    if (I1->isTerminator() || !isSafeToHoistInstr(I1, 0)) {
+      return Changed;
+    }
+    for (auto SuccIter : OtherSuccIters) {
+      Instruction *I2 = &*SuccIter;
+      if (!I1->isIdenticalToWhenDefined(I2) ||
+          !shouldHoistCommonInstructions(I1, I2, TTI) ||
+          !isSafeToHoistInstr(I2, 0))
+        return Changed;
+    }
+    for (auto SuccIter : OtherSuccIters) {
+      Instruction *I2 = &*SuccIter++;
+      BIParent->splice(SI->getIterator(), BB1, I1->getIterator());
+      if (!I2->use_empty())
+        I2->replaceAllUsesWith(I1);
+      I1->andIRFlags(I2);
+      combineMetadataForCSE(I1, I2, true);
+      I1->applyMergedLocation(I1->getDebugLoc(), I2->getDebugLoc());
+      I2->eraseFromParent();
+    }
+    I1 = &*BB1Itr++;
+    Changed = true;
+    ++NumHoistCommonInstrs;
+  }
+}
+
 // Check lifetime markers.
 static bool isLifeTimeMarker(const Instruction *I) {
   if (auto II = dyn_cast<IntrinsicInst>(I)) {
@@ -6794,6 +6863,9 @@
   if (ReduceSwitchRange(SI, Builder, DL, TTI))
     return requestResimplify();
 
+  if (HoistCommon && hoistCommonInstsOnSwitch(SI))
+    return requestResimplify();
+
   return false;
 }
 
diff --git a/llvm/test/Transforms/SimplifyCFG/hoist-common-code-on-switch.ll b/llvm/test/Transforms/SimplifyCFG/hoist-common-code-on-switch.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/Transforms/SimplifyCFG/hoist-common-code-on-switch.ll
@@ -0,0 +1,31 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -passes='simplifycfg<hoist-common-insts;no-sink-common-insts>' -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
+
+define i1 @foo(i64 %a, i64 %b, i64 %c) unnamed_addr {
+; CHECK-LABEL: @foo(
+; CHECK-NEXT:  start:
+; CHECK-NEXT:    [[TMP0:%.*]] = icmp eq i64 [[B:%.*]], [[C:%.*]]
+; CHECK-NEXT:    ret i1 [[TMP0]]
+;
+start:
+  switch i64 %a, label %bb0 [
+  i64 1, label %bb1
+  i64 2, label %bb2
+  ]
+
+bb0:                                              ; preds = %start
+  %0 = icmp eq i64 %b, %c
+  br label %exit
+
+bb1:                                              ; preds = %start
+  %1 = icmp eq i64 %b, %c
+  br label %exit
+
+bb2:                                              ; preds = %start
+  %2 = icmp eq i64 %b, %c
+  br label %exit
+
+exit:                                             ; preds = %bb2, %bb1, %bb0
+  %result = phi i1 [ %0, %bb0 ], [ %1, %bb1 ], [ %2, %bb2 ]
+  ret i1 %result
+}