diff options
Diffstat (limited to 'lib/Analysis/ScalarEvolution.cpp')
| -rw-r--r-- | lib/Analysis/ScalarEvolution.cpp | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp index 737d9b3823..14c1389b43 100644 --- a/lib/Analysis/ScalarEvolution.cpp +++ b/lib/Analysis/ScalarEvolution.cpp @@ -1976,8 +1976,8 @@ SCEVHandle ScalarEvolutionsImpl::ComputeIterationCount(const Loop *L) { break; } case ICmpInst::ICMP_SGT: { - SCEVHandle TC = HowManyLessThans(SE.getNegativeSCEV(LHS), - SE.getNegativeSCEV(RHS), L, true); + SCEVHandle TC = HowManyLessThans(SE.getNotSCEV(LHS), + SE.getNotSCEV(RHS), L, true); if (!isa<SCEVCouldNotCompute>(TC)) return TC; break; } @@ -2724,7 +2724,11 @@ bool ScalarEvolutionsImpl::executesAtLeastOnce(const Loop *L, bool isSigned, if (!PreCondLHS->getType()->isInteger()) return false; - return LHS == getSCEV(PreCondLHS) && RHS == getSCEV(PreCondRHS); + SCEVHandle PreCondLHSSCEV = getSCEV(PreCondLHS); + SCEVHandle PreCondRHSSCEV = getSCEV(PreCondRHS); + return (LHS == PreCondLHSSCEV && RHS == PreCondRHSSCEV) || + (LHS == SE.getNotSCEV(PreCondRHSSCEV) && + RHS == SE.getNotSCEV(PreCondLHSSCEV)); } /// HowManyLessThans - Return the number of times a backedge containing the |