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Implement Transforms/InstCombine/cast_ptr.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36809 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-05-05 22:41:33 +00:00
parent a993dd0cfc
commit 8c756c1fff
1 changed files with 22 additions and 1 deletions
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23
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -5593,7 +5593,28 @@ Instruction *InstCombiner::visitICmpInstWithCastAndCast(ICmpInst &ICI) {
const Type *DestTy = LHSCI->getType();
Value *RHSCIOp;
// We only handle extension cast instructions, so far. Enforce this.
// Turn icmp (ptrtoint x), (ptrtoint/c) into a compare of the input if the
// integer type is the same size as the pointer type.
if (LHSCI->getOpcode() == Instruction::PtrToInt &&
getTargetData().getPointerSizeInBits() ==
cast<IntegerType>(DestTy)->getBitWidth()) {
Value *RHSOp = 0;
if (Constant *RHSC = dyn_cast<Constant>(ICI.getOperand(1))) {
RHSOp = ConstantExpr::getPtrToInt(RHSC, SrcTy);
} else if (PtrToIntInst *RHSC = dyn_cast<PtrToIntInst>(ICI.getOperand(1))) {
RHSOp = RHSC->getOperand(0);
// If the pointer types don't match, insert a bitcast.
if (LHSCIOp->getType() != RHSOp->getType())
RHSOp = InsertCastBefore(Instruction::BitCast, RHSOp,
LHSCIOp->getType(), ICI);
}
if (RHSOp)
return new ICmpInst(ICI.getPredicate(), LHSCIOp, RHSOp);
}
// The code below only handles extension cast instructions, so far.
// Enforce this.
if (LHSCI->getOpcode() != Instruction::ZExt &&
LHSCI->getOpcode() != Instruction::SExt)
return 0;