[llvm] DAG: Use poison instead of undef in WidenVector (PR #206940)

[via llvm-commits]

llvmorg-github-actions[bot] wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-selectiondag

Author: Matt Arsenault (arsenm)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/206940.diff


1 Files Affected:

- (modified) llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp (+1-1) 


``````````diff
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index c542f8e7cc20b..fa0b564b25006 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -14498,7 +14498,7 @@ SDValue SelectionDAG::WidenVector(const SDValue &N, const SDLoc &DL) {
   EVT VT = N.getValueType();
   EVT WideVT = EVT::getVectorVT(*getContext(), VT.getVectorElementType(),
                                 NextPowerOf2(VT.getVectorNumElements()));
-  return getInsertSubvector(DL, getUNDEF(WideVT), N, 0);
+  return getInsertSubvector(DL, getPOISON(WideVT), N, 0);
 }
 
 void SelectionDAG::ExtractVectorElements(SDValue Op,

``````````

</details>


https://github.com/llvm/llvm-project/pull/206940