diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 5cda144c92..4592971336 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -1103,9 +1103,10 @@ SDOperand DAGCombiner::visitSUB(SDNode *N) { // fold (sub x, x) -> 0 if (N0 == N1) { - if (ISD::isBuildVectorAllZeros(N0.Val)) - // Zero vectors might be normalized to a particular vector type to ensure - // they are CSE'd. Return it as it is. + if (!AfterLegalize || !MVT::isVector(VT)) + // For example, zero vectors might be normalized to a particular vector + // type to ensure they are CSE'd. Avoid issuing zero vector nodes of + // *unexpected* type after legalization. return N0; return DAG.getConstant(0, N->getValueType(0)); } |