diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp index 4fe653b4bd0..6df09dfb3a4 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp @@ -1893,11 +1893,8 @@ Instruction *InstCombiner::foldICmpShlConstant(ICmpInst &Cmp, APInt ShiftedC = C.ashr(*ShiftAmt); return new ICmpInst(Pred, X, ConstantInt::get(ShType, ShiftedC)); } - if (Pred == ICmpInst::ICMP_EQ || Pred == ICmpInst::ICMP_NE) { - // This is the same code as the SGT case, but assert the pre-condition - // that is needed for this to work with equality predicates. - assert(C.ashr(*ShiftAmt).shl(*ShiftAmt) == C && - "Compare known true or false was not folded"); + if ((Pred == ICmpInst::ICMP_EQ || Pred == ICmpInst::ICMP_NE) && + C.ashr(*ShiftAmt).shl(*ShiftAmt) == C) { APInt ShiftedC = C.ashr(*ShiftAmt); return new ICmpInst(Pred, X, ConstantInt::get(ShType, ShiftedC)); } @@ -1926,11 +1923,8 @@ Instruction *InstCombiner::foldICmpShlConstant(ICmpInst &Cmp, APInt ShiftedC = C.lshr(*ShiftAmt); return new ICmpInst(Pred, X, ConstantInt::get(ShType, ShiftedC)); } - if (Pred == ICmpInst::ICMP_EQ || Pred == ICmpInst::ICMP_NE) { - // This is the same code as the UGT case, but assert the pre-condition - // that is needed for this to work with equality predicates. - assert(C.lshr(*ShiftAmt).shl(*ShiftAmt) == C && - "Compare known true or false was not folded"); + if ((Pred == ICmpInst::ICMP_EQ || Pred == ICmpInst::ICMP_NE) && + C.lshr(*ShiftAmt).shl(*ShiftAmt) == C) { APInt ShiftedC = C.lshr(*ShiftAmt); return new ICmpInst(Pred, X, ConstantInt::get(ShType, ShiftedC)); } |
