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Eliminate unnecessary uses of getZExtValue().

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106279 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-06-18 14:22:04 +00:00
parent 7720cb3823
commit e368b460a2
14 changed files with 22 additions and 21 deletions
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6
lib/Target/PowerPC/PPCISelLowering.cpp
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@@ -5042,19 +5042,19 @@ SDValue PPCTargetLowering::PerformDAGCombine(SDNode *N,
default: break;
case PPCISD::SHL:
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
if (C->getZExtValue() == 0) // 0 << V -> 0.
if (C->isNullValue()) // 0 << V -> 0.
return N->getOperand(0);
}
break;
case PPCISD::SRL:
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
if (C->getZExtValue() == 0) // 0 >>u V -> 0.
if (C->isNullValue()) // 0 >>u V -> 0.
return N->getOperand(0);
}
break;
case PPCISD::SRA:
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
if (C->getZExtValue() == 0 || // 0 >>s V -> 0.
if (C->isNullValue() || // 0 >>s V -> 0.
C->isAllOnesValue()) // -1 >>s V -> -1.
return N->getOperand(0);
}