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Revert this use of NSW; this one isn't actually safe. NSW addition 

is not reassociative.

llvm-svn: 91667
This commit is contained in:
Dan Gohman 2009-12-18 03:57:04 +00:00
parent 57e808628c
commit 7a2dab8826
1 changed files with 2 additions and 4 deletions
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6
llvm/lib/Analysis/ScalarEvolution.cpp
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@ -1457,12 +1457,10 @@ const SCEV *ScalarEvolution::getAddExpr(SmallVectorImpl<const SCEV *> &Ops,
LIOps.push_back(AddRec->getStart());
SmallVector<const SCEV *, 4> AddRecOps(AddRec->op_begin(),
AddRec->op_end());
AddRec->op_end());
AddRecOps[0] = getAddExpr(LIOps);
const SCEV *NewRec = getAddRecExpr(AddRecOps, AddRec->getLoop(),
AddRec->hasNoUnsignedWrap() && HasNUW,
AddRec->hasNoSignedWrap() && HasNSW);
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;