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 && CI2) {
+ 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: