[llvm-branch-commits] [llvm] DAG: Avoid forming shufflevector from a single extract_vector_elt (PR #122672)

[Matt Arsenault via llvm-branch-commits]

================
@@ -23855,6 +23863,13 @@ SDValue DAGCombiner::reduceBuildVecToShuffle(SDNode 
*N) {
   // VecIn accordingly.
   bool DidSplitVec = false;
   if (VecIn.size() == 2) {
----------------
arsenm wrote:

This code places a null SDValue in the first entry of the array, so the first 
found extract element is the second element 

https://github.com/llvm/llvm-project/pull/122672
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