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Fix a scalar evolution bug. Reversing everything

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does not work because of 0; 2>0 but -2U is also >0.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49928 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2008-04-18 21:38:31 +00:00
parent dc17ab2bf0
commit cf363181c1
1 changed files with 1 additions and 2 deletions
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3
lib/Analysis/ScalarEvolution.cpp
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@ -1980,8 +1980,7 @@ SCEVHandle ScalarEvolutionsImpl::ComputeIterationCount(const Loop *L) {
break;
}
case ICmpInst::ICMP_UGT: {
SCEVHandle TC = HowManyLessThans(SE.getNegativeSCEV(LHS),
SE.getNegativeSCEV(RHS), L, false);
SCEVHandle TC = HowFarToZero(SE.getMinusSCEV(LHS, RHS), L);
if (!isa<SCEVCouldNotCompute>(TC)) return TC;
break;
}