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Total brain cramp.

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llvm-svn: 48274
This commit is contained in:
Evan Cheng 2008-03-12 02:05:05 +00:00
parent 1eca74f70e
commit ee092b2dfc
1 changed files with 1 additions and 1 deletions
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2
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -1103,7 +1103,7 @@ SDOperand DAGCombiner::visitSUB(SDNode *N) {
// fold (sub x, x) -> 0
if (N0 == N1) {
if (!AfterLegalize || !MVT::isVector(VT))
if (AfterLegalize && ISD::isBuildVectorAllZeros(N0.Val))
// 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.