1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Utils/CloneFunction.cpp b/llvm/lib/Transforms/Utils/CloneFunction.cpp
index 47e3c03..dc9ca14 100644
--- a/llvm/lib/Transforms/Utils/CloneFunction.cpp
+++ b/llvm/lib/Transforms/Utils/CloneFunction.cpp
@@ -513,6 +513,12 @@ void PruningFunctionCloner::CloneBlock(
   for (BasicBlock::const_iterator II = StartingInst, IE = --BB->end(); II != IE;
        ++II) {
 
+    // Don't clone fake_use as it may suppress many optimizations
+    // due to inlining, especially SROA.
+    if (auto *IntrInst = dyn_cast<IntrinsicInst>(II))
+      if (IntrInst->getIntrinsicID() == Intrinsic::fake_use)
+        continue;
+
     Instruction *NewInst = cloneInstruction(II);
     NewInst->insertInto(NewBB, NewBB->end());