[llvm] 530d4c9 - [InstCombine] Use m_Poison() instead of m_Undef() (NFCI)

[Nikita Popov via llvm-commits]

Author: Nikita Popov
Date: 2024-05-21T16:15:30+02:00
New Revision: 530d4c9bf3d963f51375a1d7afb32f439d9c94a9

URL: https://github.com/llvm/llvm-project/commit/530d4c9bf3d963f51375a1d7afb32f439d9c94a9
DIFF: https://github.com/llvm/llvm-project/commit/530d4c9bf3d963f51375a1d7afb32f439d9c94a9.diff

LOG: [InstCombine] Use m_Poison() instead of m_Undef() (NFCI)

In this case the shuffle mask checks should already guarantee a
single-source shuffle, so this is just for clarity.

Added: 
    

Modified: 
    llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp

Removed: 
    


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diff  --git a/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp b/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
index 9a4230999e471..244f099f06542 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
@@ -1319,7 +1319,7 @@ static Instruction *foldInsEltIntoSplat(InsertElementInst &InsElt) {
 static Instruction *foldInsEltIntoIdentityShuffle(InsertElementInst &InsElt) {
   // Check if the vector operand of this insert is an identity shuffle.
   auto *Shuf = dyn_cast<ShuffleVectorInst>(InsElt.getOperand(0));
-  if (!Shuf || !match(Shuf->getOperand(1), m_Undef()) ||
+  if (!Shuf || !match(Shuf->getOperand(1), m_Poison()) ||
       !(Shuf->isIdentityWithExtract() || Shuf->isIdentityWithPadding()))
     return nullptr;