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Teach SCEVExpander::InsertCastOfTo to avoid creating inttoptr-of-ptrtoint

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and ptrtoint-of-inttoptr expressions. This fixes a regression in 300.twolf.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69293 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-04-16 15:52:57 +00:00
parent 798d3923e0
commit f04fa483b8
2 changed files with 10 additions and 2 deletions
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8
lib/Analysis/ScalarEvolutionExpander.cpp
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@ -26,6 +26,14 @@ Value *SCEVExpander::InsertCastOfTo(Instruction::CastOps opcode, Value *V,
if (opcode == Instruction::BitCast && V->getType() == Ty)
return V;
// Short-circuit unnecessary inttoptr<->ptrtoint casts.
if (opcode == Instruction::PtrToInt && Ty == TD.getIntPtrType())
if (IntToPtrInst *ITP = dyn_cast<IntToPtrInst>(V))
return ITP->getOperand(0);
if (opcode == Instruction::IntToPtr && V->getType() == TD.getIntPtrType())
if (PtrToIntInst *PTI = dyn_cast<PtrToIntInst>(V))
return PTI->getOperand(0);
// FIXME: keep track of the cast instruction.
if (Constant *C = dyn_cast<Constant>(V))
return ConstantExpr::getCast(opcode, C, Ty);