diff options
Diffstat (limited to 'lib/Analysis/BranchProbabilityInfo.cpp')
-rw-r--r-- | lib/Analysis/BranchProbabilityInfo.cpp | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/lib/Analysis/BranchProbabilityInfo.cpp b/lib/Analysis/BranchProbabilityInfo.cpp index 7cdf828c2f..86560ca33d 100644 --- a/lib/Analysis/BranchProbabilityInfo.cpp +++ b/lib/Analysis/BranchProbabilityInfo.cpp @@ -398,10 +398,24 @@ bool BranchProbabilityInfo::calcZeroHeuristics(BasicBlock *BB) { // InstCombine canonicalizes X <= 0 into X < 1. // X <= 0 -> Unlikely isProb = false; - } else if (CV->isAllOnesValue() && CI->getPredicate() == CmpInst::ICMP_SGT) { - // InstCombine canonicalizes X >= 0 into X > -1. - // X >= 0 -> Likely - isProb = true; + } else if (CV->isAllOnesValue()) { + switch (CI->getPredicate()) { + case CmpInst::ICMP_EQ: + // X == -1 -> Unlikely + isProb = false; + break; + case CmpInst::ICMP_NE: + // X != -1 -> Likely + isProb = true; + break; + case CmpInst::ICMP_SGT: + // InstCombine canonicalizes X >= 0 into X > -1. + // X >= 0 -> Likely + isProb = true; + break; + default: + return false; + } } else { return false; } |