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LSR: Fold redundant bitcasts on-the-fly.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146597 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2011-12-14 22:07:19 +00:00
parent ec04a3f8db
commit 19154f4576
2 changed files with 12 additions and 7 deletions
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lib/Analysis/ScalarEvolutionExpander.cpp
+8 -3
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@@ -73,9 +73,14 @@ Value *SCEVExpander::InsertNoopCastOfTo(Value *V, Type *Ty) {
"InsertNoopCastOfTo cannot change sizes!");
// Short-circuit unnecessary bitcasts.
if (Op == Instruction::BitCast && V->getType() == Ty)
return V;
if (Op == Instruction::BitCast) {
if (V->getType() == Ty)
return V;
if (CastInst *CI = dyn_cast<CastInst>(V)) {
if (CI->getOperand(0)->getType() == Ty)
return CI->getOperand(0);
}
}
// Short-circuit unnecessary inttoptr<->ptrtoint casts.
if ((Op == Instruction::PtrToInt || Op == Instruction::IntToPtr) &&
SE.getTypeSizeInBits(Ty) == SE.getTypeSizeInBits(V->getType())) {