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Implement a FIXME: if we're going to insert a cast, we might as well only 

insert it once!

llvm-svn: 12955
This commit is contained in:
Chris Lattner 2004-04-14 22:01:22 +00:00
parent e3e2c91997
commit d420fe63ea
1 changed files with 15 additions and 1 deletions
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16
llvm/lib/Analysis/ScalarEvolution.cpp
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@ -2484,7 +2484,21 @@ Value *ScalarEvolutionRewriter::ExpandCodeFor(SCEVHandle SH,
if (Constant *C = dyn_cast<Constant>(V))
return ConstantExpr::getCast(C, Ty);
else if (Instruction *I = dyn_cast<Instruction>(V)) {
// FIXME: check to see if there is already a cast!
// Check to see if there is already a cast. If there is, use it.
for (Value::use_iterator UI = I->use_begin(), E = I->use_end();
UI != E; ++UI) {
if ((*UI)->getType() == Ty)
if (CastInst *CI = dyn_cast<CastInst>(cast<Instruction>(*UI))) {
BasicBlock::iterator It = I; ++It;
if (It != BasicBlock::iterator(CI)) {
// Splice the cast immediately after the operand in question.
I->getParent()->getInstList().splice(It,
CI->getParent()->getInstList(),
CI);
}
return CI;
}
}
BasicBlock::iterator IP = I; ++IP;
if (InvokeInst *II = dyn_cast<InvokeInst>(I))
IP = II->getNormalDest()->begin();