SSATmp* TraceBuilder::cseLookup(IRInstruction* inst,
const folly::Optional<IdomVector>& idoms) {
auto tmp = cseHashTable(inst)->lookup(inst);
if (tmp && idoms) {
// During a reoptimize pass, we need to make sure that any values
// we want to reuse for CSE are only reused in blocks dominated by
// the block that defines it.
if (!dominates(tmp->inst()->block(), inst->block(), *idoms)) {
return nullptr;
}
}
return tmp;
}
void TraceBuilder::cseKill(SSATmp* src) {
if (src->inst()->canCSE()) {
cseHashTable(src->inst())->erase(src);
}
}
void FrameState::cseKill(SSATmp* src) {
if (src->inst()->canCSE()) {
cseHashTable(src->inst())->erase(src);
}
}
void TraceBuilder::cseInsert(IRInstruction* inst) {
cseHashTable(inst)->insert(inst->dst());
}
void FrameState::cseInsert(const IRInstruction* inst) {
cseHashTable(inst)->insert(inst->dst());
}