std::vector<Instruction*> DefUseManager::GetAnnotations(uint32_t id) const {
std::vector<Instruction*> annos;
const Instruction* def = GetDef(id);
if (!def) return annos;
ForEachUser(def, [&annos](Instruction* user) {
if (IsAnnotationInst(user->opcode())) {
annos.push_back(user);
}
});
return annos;
}
bool AggressiveDCEPass::IsTargetDead(Instruction* inst) {
const uint32_t tId = inst->GetSingleWordInOperand(0);
Instruction* tInst = get_def_use_mgr()->GetDef(tId);
if (IsAnnotationInst(tInst->opcode())) {
// This must be a decoration group. We go through annotations in a specific
// order. So if this is not used by any group or group member decorates, it
// is dead.
assert(tInst->opcode() == SpvOpDecorationGroup);
bool dead = true;
get_def_use_mgr()->ForEachUser(tInst, [&dead](Instruction* user) {
if (user->opcode() == SpvOpGroupDecorate ||
user->opcode() == SpvOpGroupMemberDecorate)
dead = false;
});
return dead;
}
return IsDead(tInst);
}
