[llvm] [PPC] Change placeholder from `undef` to `poison` (PR #134552)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-powerpc

Author: Pedro Lobo (pedroclobo)

<details>
<summary>Changes</summary>

Call `insertelement` on a `poison` value instead of `undef`.

---
Full diff: https://github.com/llvm/llvm-project/pull/134552.diff


1 Files Affected:

- (modified) llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp (+1-1) 


``````````diff
diff --git a/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp b/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp
index 2a5af3e50af26..3a4c2fcad8c83 100644
--- a/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp
+++ b/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp
@@ -126,7 +126,7 @@ PPCTTIImpl::instCombineIntrinsic(InstCombiner &IC, IntrinsicInst &II) const {
             IC.Builder.CreateBitCast(II.getArgOperand(0), Mask->getType());
         Value *Op1 =
             IC.Builder.CreateBitCast(II.getArgOperand(1), Mask->getType());
-        Value *Result = UndefValue::get(Op0->getType());
+        Value *Result = PoisonValue::get(Op0->getType());
 
         // Only extract each element once.
         Value *ExtractedElts[32];

``````````

</details>


https://github.com/llvm/llvm-project/pull/134552