[llvm] [InstCombine] Fold length-one memset with variable fillFold length-one memset with variable fill (PR #217224)

[via llvm-commits]

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@@ -221,6 +221,12 @@ Instruction *InstCombinerImpl::SimplifyAnyMemTransfer(AnyMemTransferInst *MI) {
 }
 
 Instruction *InstCombinerImpl::SimplifyAnyMemSet(AnyMemSetInst *MI) {
+  ConstantInt *LenC = dyn_cast<ConstantInt>(MI->getLength());
+  Value *Fill = MI->getValue();
+
+  if (MI->isVolatile())
+    return nullptr;
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hsnaveen2u wrote:

Thanks for the review.
Done. I restored the original volatile handling and removed the volatile-specific test.

https://github.com/llvm/llvm-project/pull/217224