diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp index 9bd5d53382e..b43520d9e92 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp @@ -2918,6 +2918,12 @@ static Value *foldICmpWithLowBitMaskedVal(ICmpInst &I, return nullptr; // Ignore the other case. DstPred = ICmpInst::Predicate::ICMP_SGT; break; + case ICmpInst::Predicate::ICMP_SGE: + // x & (-1 >> y) s>= x -> x s<= (-1 >> y) + if (X != I.getOperand(1)) // X must be on RHS of comparison! + return nullptr; // Ignore the other case. + DstPred = ICmpInst::Predicate::ICMP_SLE; + break; case ICmpInst::Predicate::ICMP_SLE: // x s<= x & (-1 >> y) -> x s<= (-1 >> y) if (X != I.getOperand(0)) // X must be on LHS of comparison! |
