[llvm] db9e9ea - [IR] Generate poison for all-poison scalable shufflevector mask

[Nikita Popov via llvm-commits]

Author: Nikita Popov
Date: 2024-06-24T16:56:02+02:00
New Revision: db9e9eabb7835bae4285a3f13c7cc7c985455e27

URL: https://github.com/llvm/llvm-project/commit/db9e9eabb7835bae4285a3f13c7cc7c985455e27
DIFF: https://github.com/llvm/llvm-project/commit/db9e9eabb7835bae4285a3f13c7cc7c985455e27.diff

LOG: [IR] Generate poison for all-poison scalable shufflevector mask

Ultimately doesn't matter because the bitcode reader interprets
undef and poison interchangeably in this context.

Added: 
    

Modified: 
    llvm/lib/IR/Instructions.cpp

Removed: 
    


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diff  --git a/llvm/lib/IR/Instructions.cpp b/llvm/lib/IR/Instructions.cpp
index f6f3876efdea4..445323f2a085b 100644
--- a/llvm/lib/IR/Instructions.cpp
+++ b/llvm/lib/IR/Instructions.cpp
@@ -1822,7 +1822,7 @@ Constant *ShuffleVectorInst::convertShuffleMaskForBitcode(ArrayRef<int> Mask,
     Type *VecTy = VectorType::get(Int32Ty, Mask.size(), true);
     if (Mask[0] == 0)
       return Constant::getNullValue(VecTy);
-    return UndefValue::get(VecTy);
+    return PoisonValue::get(VecTy);
   }
   SmallVector<Constant *, 16> MaskConst;
   for (int Elem : Mask) {