RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-11-24 03:33:20 +01:00
Code Issues Projects Releases Wiki Activity

Implement Transforms/InstCombine/cast_ptr.ll

Browse Source 
llvm-svn: 36809
This commit is contained in:
Chris Lattner 2007-05-05 22:41:33 +00:00
parent cfda811d3c
commit 26c55e2dda
1 changed files with 22 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -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;