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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48140 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-03-10 07:59:01 +00:00
parent c161188703
commit ff247d2ed4
1 changed files with 2 additions and 1 deletions
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3
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -1102,12 +1102,13 @@ SDOperand DAGCombiner::visitSUB(SDNode *N) {
}
// fold (sub x, x) -> 0
if (N0 == N1)
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.
return N0;
return DAG.getConstant(0, N->getValueType(0));
}
// fold (sub c1, c2) -> c1-c2
if (N0C && N1C)
return DAG.getNode(ISD::SUB, VT, N0, N1);