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Revert this use of NUW/NSW also. Overflow-undefined multiplication isn't

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associative either.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91701 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-12-18 18:45:31 +00:00
parent fda60d35c2
commit 59de33ef39
1 changed files with 6 additions and 3 deletions
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9
lib/Analysis/ScalarEvolution.cpp
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@ -1460,7 +1460,10 @@ const SCEV *ScalarEvolution::getAddExpr(SmallVectorImpl<const SCEV *> &Ops,
AddRec->op_end());
AddRecOps[0] = getAddExpr(LIOps);
// It's tempting to propogate NUW/NSW flags here, but nuw/nsw addition
// is not associative so this isn't necessarily safe.
const SCEV *NewRec = getAddRecExpr(AddRecOps, AddRec->getLoop());
// If all of the other operands were loop invariant, we are done.
if (Ops.size() == 1) return NewRec;
@ -1636,9 +1639,9 @@ const SCEV *ScalarEvolution::getMulExpr(SmallVectorImpl<const SCEV *> &Ops,
}
}
const SCEV *NewRec = getAddRecExpr(NewOps, AddRec->getLoop(),
AddRec->hasNoUnsignedWrap() && HasNUW,
AddRec->hasNoSignedWrap() && HasNSW);
// It's tempting to propogate NUW/NSW flags here, but nuw/nsw multiplication
// is not associative so this isn't necessarily safe.
const SCEV *NewRec = getAddRecExpr(NewOps, AddRec->getLoop());
// If all of the other operands were loop invariant, we are done.
if (Ops.size() == 1) return NewRec;