diff options
Diffstat (limited to 'lib/Transforms/InstCombine/InstCombineAndOrXor.cpp')
| -rw-r--r-- | lib/Transforms/InstCombine/InstCombineAndOrXor.cpp | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp b/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp index 3f4a857..5876f40 100644 --- a/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp +++ b/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp @@ -472,6 +472,25 @@ Value *InstCombiner::FoldAndOfICmps(ICmpInst *LHS, ICmpInst *RHS) { Value *NewOr = Builder->CreateOr(Val, Val2); return Builder->CreateICmp(LHSCC, NewOr, LHSCst); } + + // (icmp ne (A & C1), 0) & (icmp ne (A & C2), 0) --> + // (icmp eq (A & (C1|C2)), (C1|C2)) + if (LHSCC == ICmpInst::ICMP_NE && LHSCst->isZero()) { + Instruction *I1 = dyn_cast<Instruction>(Val); + Instruction *I2 = dyn_cast<Instruction>(Val2); + if (I1 && I1->getOpcode() == Instruction::And && + I2 && I2->getOpcode() == Instruction::And && + I1->getOperand(0) == I1->getOperand(0)) { + ConstantInt *CI1 = dyn_cast<ConstantInt>(I1->getOperand(1)); + ConstantInt *CI2 = dyn_cast<ConstantInt>(I2->getOperand(1)); + if (CI1 && !CI1->isZero() && CI2 && !CI2->isZero() && + CI1->getValue().operator&(CI2->getValue()) == 0) { + Constant *ConstOr = ConstantExpr::getOr(CI1, CI2); + Value *NewAnd = Builder->CreateAnd(I1->getOperand(0), ConstOr); + return Builder->CreateICmp(ICmpInst::ICMP_EQ, NewAnd, ConstOr); + } + } + } } // From here on, we only handle: |
