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Negating a recurrence preserves no-self-wrap.

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llvm-svn: 127593
This commit is contained in:
Andrew Trick 2011-03-14 17:38:54 +00:00
parent 973ab94013
commit da253e79f0
1 changed files with 11 additions and 0 deletions
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11
lib/Analysis/ScalarEvolution.cpp
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@ -1792,6 +1792,17 @@ const SCEV *ScalarEvolution::getMulExpr(SmallVectorImpl<const SCEV *> &Ops,
if (AnyFolded)
return getAddExpr(NewOps);
}
else if (const SCEVAddRecExpr *
AddRec = dyn_cast<SCEVAddRecExpr>(Ops[1])) {
// Negation preserves a recurrence's no self-wrap property.
SmallVector<const SCEV *, 4> Operands;
for (SCEVAddRecExpr::op_iterator I = AddRec->op_begin(),
E = AddRec->op_end(); I != E; ++I) {
Operands.push_back(getMulExpr(Ops[0], *I));
}
return getAddRecExpr(Operands, AddRec->getLoop(),
AddRec->getNoWrapFlags(SCEV::FlagNW));
}
}
}