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Somewhat better solution.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48170 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-03-10 19:58:22 +00:00
parent d2cde68855
commit 62fcc41d95
1 changed files with 4 additions and 3 deletions
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7
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -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));
}