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Short-circuit inttoptr-ptrtoint constant expressions; these aren't

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always folded by the regular constant folder because it doesn't have
TargetData information.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70553 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-05-01 17:00:00 +00:00
parent 99a1302ae4
commit 80dcdee0f4
1 changed files with 8 additions and 1 deletions
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9
lib/Analysis/ScalarEvolutionExpander.cpp
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@ -27,13 +27,20 @@ Value *SCEVExpander::InsertCastOfTo(Instruction::CastOps opcode, Value *V,
// Short-circuit unnecessary inttoptr<->ptrtoint casts.
if ((opcode == Instruction::PtrToInt || opcode == Instruction::IntToPtr) &&
SE.getTypeSizeInBits(Ty) == SE.getTypeSizeInBits(V->getType()))
SE.getTypeSizeInBits(Ty) == SE.getTypeSizeInBits(V->getType())) {
if (CastInst *CI = dyn_cast<CastInst>(V))
if ((CI->getOpcode() == Instruction::PtrToInt ||
CI->getOpcode() == Instruction::IntToPtr) &&
SE.getTypeSizeInBits(CI->getType()) ==
SE.getTypeSizeInBits(CI->getOperand(0)->getType()))
return CI->getOperand(0);
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
if ((CE->getOpcode() == Instruction::PtrToInt ||
CE->getOpcode() == Instruction::IntToPtr) &&
SE.getTypeSizeInBits(CE->getType()) ==
SE.getTypeSizeInBits(CE->getOperand(0)->getType()))
return CE->getOperand(0);
}
// FIXME: keep track of the cast instruction.
if (Constant *C = dyn_cast<Constant>(V))