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Implement getelementptr.ll:test11

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21647 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-05-01 04:42:15 +00:00
parent f05fd0893e
commit 9fb25db11e
1 changed files with 16 additions and 0 deletions
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16
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -2879,6 +2879,22 @@ Instruction *InstCombiner::visitSetCondInst(SetCondInst &I) {
if (Constant *RHSC = dyn_cast<Constant>(Op1)) {
if (Instruction *LHSI = dyn_cast<Instruction>(Op0))
switch (LHSI->getOpcode()) {
case Instruction::GetElementPtr:
if (RHSC->isNullValue()) {
// Transform setcc GEP P, int 0, int 0, int 0, null -> setcc P, null
bool isAllZeros = true;
for (unsigned i = 1, e = LHSI->getNumOperands(); i != e; ++i)
if (!isa<Constant>(LHSI->getOperand(i)) ||
!cast<Constant>(LHSI->getOperand(i))->isNullValue()) {
isAllZeros = false;
break;
}
if (isAllZeros)
return new SetCondInst(I.getOpcode(), LHSI->getOperand(0),
Constant::getNullValue(LHSI->getOperand(0)->getType()));
}
break;
case Instruction::PHI:
if (Instruction *NV = FoldOpIntoPhi(I))
return NV;