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Just return undef for invalid masks or elts, and since we're doing that,

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just do it earlier too.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118195 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher 2010-11-03 20:44:42 +00:00
parent 964bc25e5a
commit d81f17acb4
1 changed files with 6 additions and 5 deletions
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11
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -6242,6 +6242,10 @@ SDValue DAGCombiner::visitEXTRACT_VECTOR_ELT(SDNode *N) {
if (!LN0 || !LN0->hasOneUse() || LN0->isVolatile())
return SDValue();
// If Idx was -1 above, Elt is going to be -1, so just return undef.
if (Elt == -1)
return DAG.getUNDEF(LN0->getBasePtr().getValueType());
unsigned Align = LN0->getAlignment();
if (NewLoad) {
// Check the resultant load doesn't need a higher alignment than the
@ -6257,11 +6261,8 @@ SDValue DAGCombiner::visitEXTRACT_VECTOR_ELT(SDNode *N) {
SDValue NewPtr = LN0->getBasePtr();
unsigned PtrOff = 0;
// If Idx was -1 above, Elt is going to be -1, so just use undef as our
// new pointer.
if (Elt == -1) {
NewPtr = DAG.getUNDEF(NewPtr.getValueType());
} else if (Elt) {
if (Elt) {
PtrOff = LVT.getSizeInBits() * Elt / 8;
EVT PtrType = NewPtr.getValueType();
if (TLI.isBigEndian())