[llvm] r262852 - DAGCombiner: Check legality before creating extract_vector_elt

[Matt Arsenault via llvm-commits]

Author: arsenm
Date: Mon Mar  7 15:10:09 2016
New Revision: 262852

URL: http://llvm.org/viewvc/llvm-project?rev=262852&view=rev
Log:
DAGCombiner: Check legality before creating extract_vector_elt

Problem not hit by any in tree target.

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp?rev=262852&r1=262851&r2=262852&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Mon Mar  7 15:10:09 2016
@@ -7207,7 +7207,9 @@ SDValue DAGCombiner::visitTRUNCATE(SDNod
   if (N0.getOpcode() == ISD::BITCAST && !VT.isVector()) {
     SDValue VecSrc = N0.getOperand(0);
     EVT SrcVT = VecSrc.getValueType();
-    if (SrcVT.isVector() && SrcVT.getScalarType() == VT) {
+    if (SrcVT.isVector() && SrcVT.getScalarType() == VT &&
+        (!LegalOperations ||
+         TLI.isOperationLegal(ISD::EXTRACT_VECTOR_ELT, SrcVT))) {
       SDLoc SL(N);
 
       EVT IdxVT = TLI.getVectorIdxTy(DAG.getDataLayout());