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Fix the folding of undef in several binary operators to recognize

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undef in either the left or right operand.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@38489 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2007-07-10 14:20:37 +00:00
parent 087d90e912
commit d595b5f1f0
1 changed files with 7 additions and 7 deletions
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14
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -855,7 +855,7 @@ SDOperand DAGCombiner::visitADD(SDNode *N) {
if (FoldedVOp.Val) return FoldedVOp;
// fold (add x, undef) -> undef
if (N1.getOpcode() == ISD::UNDEF)
if (N0.getOpcode() == ISD::UNDEF || N1.getOpcode() == ISD::UNDEF)
return N1;
// fold (add c1, c2) -> c1+c2
if (N0C && N1C)
@ -1047,7 +1047,7 @@ SDOperand DAGCombiner::visitMUL(SDNode *N) {
if (FoldedVOp.Val) return FoldedVOp;
// fold (mul x, undef) -> 0
if (N1.getOpcode() == ISD::UNDEF)
if (N0.getOpcode() == ISD::UNDEF || N1.getOpcode() == ISD::UNDEF)
return DAG.getConstant(0, VT);
// fold (mul c1, c2) -> c1*c2
if (N0C && N1C)
@ -1339,7 +1339,7 @@ SDOperand DAGCombiner::visitMULHS(SDNode *N) {
DAG.getConstant(MVT::getSizeInBits(N0.getValueType())-1,
TLI.getShiftAmountTy()));
// fold (mulhs x, undef) -> 0
if (N1.getOpcode() == ISD::UNDEF)
if (N0.getOpcode() == ISD::UNDEF || N1.getOpcode() == ISD::UNDEF)
return DAG.getConstant(0, VT);
return SDOperand();
@ -1358,7 +1358,7 @@ SDOperand DAGCombiner::visitMULHU(SDNode *N) {
if (N1C && N1C->getValue() == 1)
return DAG.getConstant(0, N0.getValueType());
// fold (mulhu x, undef) -> 0
if (N1.getOpcode() == ISD::UNDEF)
if (N0.getOpcode() == ISD::UNDEF || N1.getOpcode() == ISD::UNDEF)
return DAG.getConstant(0, VT);
return SDOperand();
@ -1416,7 +1416,7 @@ SDOperand DAGCombiner::visitAND(SDNode *N) {
if (FoldedVOp.Val) return FoldedVOp;
// fold (and x, undef) -> 0
if (N1.getOpcode() == ISD::UNDEF)
if (N0.getOpcode() == ISD::UNDEF || N1.getOpcode() == ISD::UNDEF)
return DAG.getConstant(0, VT);
// fold (and c1, c2) -> c1&c2
if (N0C && N1C)
@ -1604,7 +1604,7 @@ SDOperand DAGCombiner::visitOR(SDNode *N) {
if (FoldedVOp.Val) return FoldedVOp;
// fold (or x, undef) -> -1
if (N1.getOpcode() == ISD::UNDEF)
if (N0.getOpcode() == ISD::UNDEF || N1.getOpcode() == ISD::UNDEF)
return DAG.getConstant(~0ULL, VT);
// fold (or c1, c2) -> c1|c2
if (N0C && N1C)
@ -1890,7 +1890,7 @@ SDOperand DAGCombiner::visitXOR(SDNode *N) {
if (FoldedVOp.Val) return FoldedVOp;
// fold (xor x, undef) -> undef
if (N1.getOpcode() == ISD::UNDEF)
if (N0.getOpcode() == ISD::UNDEF || N1.getOpcode() == ISD::UNDEF)
return N1;
// fold (xor c1, c2) -> c1^c2
if (N0C && N1C)