[PATCH] D103880: [SDAG] Fix pow2 assumption when splitting vectors

[Carl Ritson via Phabricator via llvm-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rGcfbb92441f17: [SDAG] Fix pow2 assumption when splitting vectors (authored by critson).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D103880/new/

https://reviews.llvm.org/D103880

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp


Index: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
===================================================================
--- llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -19370,7 +19370,9 @@
       unsigned SplitSize = NearestPow2 / 2;
       EVT SplitVT = EVT::getVectorVT(*DAG.getContext(),
                                      InVT.getVectorElementType(), SplitSize);
-      if (TLI.isTypeLegal(SplitVT)) {
+      if (TLI.isTypeLegal(SplitVT) &&
+          SplitSize + SplitVT.getVectorNumElements() <=
+              InVT.getVectorNumElements()) {
         SDValue VecIn2 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, SplitVT, Vec,
                                      DAG.getVectorIdxConstant(SplitSize, DL));
         SDValue VecIn1 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, SplitVT, Vec,


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