bool visitICmpInst(ICmpInst& inst) {
// errs() << "got icmp instruction! " << inst << '\n';
bool changed = false;
if (inst.getPredicate() == CmpInst::ICMP_EQ) {
assert(inst.getNumOperands() == 2);
if (inst.getOperand(1) == processing) {
inst.swapOperands();
changed = true;
any_changes = true;
}
assert(dyn_cast<Instruction>(inst.getOperand(0)) == processing);
Value* other = inst.getOperand(1);
if (isa<ConstantPointerNull>(other)) {
if (VERBOSITY("opt") >= 2) {
errs() << inst << '\n';
errs() << "replacing with false!\n";
}
Value* new_value = ConstantInt::getFalse(other->getContext());
inst.replaceAllUsesWith(new_value);
inst.eraseFromParent();
changed = true;
any_changes = true;
}
}
return changed;
}
