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LangRef.html says that inttoptr and ptrtoint always use zero-extension

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when the cast is extending.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95046 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-02-02 01:44:02 +00:00
parent 6acb86dcfa
commit 3b5487e627
1 changed files with 32 additions and 21 deletions
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53
lib/Transforms/InstCombine/InstCombineCasts.cpp
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@ -1145,16 +1145,22 @@ Instruction *InstCombiner::visitSIToFP(CastInst &CI) {
}
Instruction *InstCombiner::visitIntToPtr(IntToPtrInst &CI) {
// If the source integer type is larger than the intptr_t type for
// this target, do a trunc to the intptr_t type, then inttoptr of it. This
// allows the trunc to be exposed to other transforms. Don't do this for
// extending inttoptr's, because we don't know if the target sign or zero
// extends to pointers.
if (TD && CI.getOperand(0)->getType()->getScalarSizeInBits() >
TD->getPointerSizeInBits()) {
Value *P = Builder->CreateTrunc(CI.getOperand(0),
TD->getIntPtrType(CI.getContext()), "tmp");
return new IntToPtrInst(P, CI.getType());
// If the source integer type is not the intptr_t type for this target, do a
// trunc or zext to the intptr_t type, then inttoptr of it. This allows the
// cast to be exposed to other transforms.
if (TD) {
if (CI.getOperand(0)->getType()->getScalarSizeInBits() >
TD->getPointerSizeInBits()) {
Value *P = Builder->CreateTrunc(CI.getOperand(0),
TD->getIntPtrType(CI.getContext()), "tmp");
return new IntToPtrInst(P, CI.getType());
}
if (CI.getOperand(0)->getType()->getScalarSizeInBits() <
TD->getPointerSizeInBits()) {
Value *P = Builder->CreateZExt(CI.getOperand(0),
TD->getIntPtrType(CI.getContext()), "tmp");
return new IntToPtrInst(P, CI.getType());
}
}
if (Instruction *I = commonCastTransforms(CI))
@ -1216,17 +1222,22 @@ Instruction *InstCombiner::commonPointerCastTransforms(CastInst &CI) {
}
Instruction *InstCombiner::visitPtrToInt(PtrToIntInst &CI) {
// If the destination integer type is smaller than the intptr_t type for
// this target, do a ptrtoint to intptr_t then do a trunc. This allows the
// trunc to be exposed to other transforms. Don't do this for extending
// ptrtoint's, because we don't know if the target sign or zero extends its
// pointers.
if (TD &&
CI.getType()->getScalarSizeInBits() < TD->getPointerSizeInBits()) {
Value *P = Builder->CreatePtrToInt(CI.getOperand(0),
TD->getIntPtrType(CI.getContext()),
"tmp");
return new TruncInst(P, CI.getType());
// If the destination integer type is not the intptr_t type for this target,
// do a ptrtoint to intptr_t then do a trunc or zext. This allows the cast
// to be exposed to other transforms.
if (TD) {
if (CI.getType()->getScalarSizeInBits() < TD->getPointerSizeInBits()) {
Value *P = Builder->CreatePtrToInt(CI.getOperand(0),
TD->getIntPtrType(CI.getContext()),
"tmp");
return new TruncInst(P, CI.getType());
}
if (CI.getType()->getScalarSizeInBits() > TD->getPointerSizeInBits()) {
Value *P = Builder->CreatePtrToInt(CI.getOperand(0),
TD->getIntPtrType(CI.getContext()),
"tmp");
return new ZExtInst(P, CI.getType());
}
}
return commonPointerCastTransforms(CI);