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Simplify this code.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106254 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-06-17 23:34:09 +00:00
parent 597ec8ed51
commit 27ed6a41ce
1 changed files with 3 additions and 11 deletions
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14
lib/Analysis/ScalarEvolution.cpp
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@ -1747,17 +1747,9 @@ const SCEV *ScalarEvolution::getMulExpr(SmallVectorImpl<const SCEV *> &Ops,
// NLI * LI * {Start,+,Step} --> NLI * {LI*Start,+,LI*Step}
SmallVector<const SCEV *, 4> NewOps;
NewOps.reserve(AddRec->getNumOperands());
if (LIOps.size() == 1) {
const SCEV *Scale = LIOps[0];
for (unsigned i = 0, e = AddRec->getNumOperands(); i != e; ++i)
NewOps.push_back(getMulExpr(Scale, AddRec->getOperand(i)));
} else {
for (unsigned i = 0, e = AddRec->getNumOperands(); i != e; ++i) {
SmallVector<const SCEV *, 4> MulOps(LIOps.begin(), LIOps.end());
MulOps.push_back(AddRec->getOperand(i));
NewOps.push_back(getMulExpr(MulOps));
}
}
const SCEV *Scale = getMulExpr(LIOps);
for (unsigned i = 0, e = AddRec->getNumOperands(); i != e; ++i)
NewOps.push_back(getMulExpr(Scale, AddRec->getOperand(i)));
// It's tempting to propagate the NSW flag here, but nsw multiplication
// is not associative so this isn't necessarily safe.