diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp index c2b9e71c6f2..c7ed098cbf8 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp @@ -919,11 +919,11 @@ Instruction *InstCombiner::FoldICmpShrCst(ICmpInst &ICI, BinaryOperator *Shr, if (ICI.isSigned() != (Shr->getOpcode() == Instruction::AShr)) return 0; - // Otherwise, all lshr and all exact ashr's are equivalent to a udiv/sdiv by - // a power of 2. Since we already have logic to simplify these, transform - // to div and then simplify the resultant comparison. + // Otherwise, all lshr and most exact ashr's are equivalent to a udiv/sdiv + // by a power of 2. Since we already have logic to simplify these, + // transform to div and then simplify the resultant comparison. if (Shr->getOpcode() == Instruction::AShr && - !Shr->isExact()) + (!Shr->isExact() || ShAmtVal == TypeBits - 1)) return 0; // Revisit the shift (to delete it). |
