diff options
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp index abbc89b0a10..e59406c636a 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp @@ -705,7 +705,7 @@ Instruction *InstCombiner::FoldICmpAddOpCst(ICmpInst &ICI, // so the values can never be equal. Similiarly for all other "or equals" // operators. - // (X+1) <u X --> X >u (MAXUINT-1) --> X != 255 + // (X+1) <u X --> X >u (MAXUINT-1) --> X == 255 // (X+2) <u X --> X >u (MAXUINT-2) --> X > 253 // (X+MAXUINT) <u X --> X >u (MAXUINT-MAXUINT) --> X != 0 if (Pred == ICmpInst::ICMP_ULT || Pred == ICmpInst::ICMP_ULE) { @@ -713,7 +713,8 @@ Instruction *InstCombiner::FoldICmpAddOpCst(ICmpInst &ICI, if (isNUW) return ReplaceInstUsesWith(ICI, ConstantInt::getFalse(X->getContext())); - Value *R = ConstantExpr::getSub(ConstantInt::get(CI->getType(), -1ULL), CI); + Value *R = + ConstantExpr::getSub(ConstantInt::getAllOnesValue(CI->getType()), CI); return new ICmpInst(ICmpInst::ICMP_UGT, X, R); } |
