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Fix a bogus splat xform:

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shuffle <undef, undef, x, undef>, <undef, undef, undef, undef>, <2, 2, 2, 2>
!=
<undef, undef, x, undef>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42111 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-09-18 21:54:37 +00:00
parent d84c3ab4a7
commit e0480d2ec2
2 changed files with 245 additions and 2 deletions
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lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+1 -2
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@@ -4093,8 +4093,7 @@ SDOperand DAGCombiner::visitVECTOR_SHUFFLE(SDNode *N) {
if (!Base.Val)
return N0;
for (unsigned i = 0; i != NumElems; ++i) {
if (V->getOperand(i).getOpcode() != ISD::UNDEF &&
V->getOperand(i) != Base) {
if (V->getOperand(i) != Base) {
AllSame = false;
break;
}