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mem2reg is generally correct

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ZhuangYumin
2024-10-18 12:50:28 +00:00
parent c4ca99d7b1
commit 0f016c8eb0
1 changed files with 62 additions and 47 deletions
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109
src/opt/mem2reg.cpp
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@ -92,92 +92,95 @@ void BuildDomForFunction(const std::shared_ptr<FunctionDefItem> &func, const CFG
}
}
size_t InNodeReplace(CFGNodeType *cur_node, std::string origin_var_name, size_t &cur_version,
std::stack<std::string> &name_stk) {
size_t versions_pushed = 0;
std::unordered_map<std::string, size_t> InNodeReplace(
CFGNodeType *cur_node, std::unordered_map<std::string, size_t> &var_to_version,
std::unordered_map<std::string, std::stack<std::string>> &var_to_name_stk) {
std::unordered_map<std::string, size_t> var_to_versions_pushed;
BlockItem *cur_block = cur_node->corresponding_block;
std::vector<std::shared_ptr<ActionItem>> new_actions;
std::unordered_set<std::string> is_an_alias_generated_by_load;
if (cur_block->phi_map.find(origin_var_name) != cur_block->phi_map.end()) {
name_stk.push(cur_block->phi_map[origin_var_name]->result_full);
versions_pushed++;
std::unordered_map<std::string, std::string> is_an_alias_generated_by_load;
for (auto [origin_var_name, _] : var_to_version) {
if (cur_block->phi_map.find(origin_var_name) != cur_block->phi_map.end()) {
var_to_name_stk[origin_var_name].push(cur_block->phi_map[origin_var_name]->result_full);
var_to_versions_pushed[origin_var_name]++;
}
}
for (auto act : cur_block->actions) {
if (std::dynamic_pointer_cast<JMPActionItem>(act))
throw std::runtime_error("JMPActionItem should not appear in actions");
if (auto alloca_act = std::dynamic_pointer_cast<AllocaAction>(act)) {
if (alloca_act->name_full == origin_var_name) {
if (var_to_version.find(alloca_act->name_full) != var_to_version.end()) {
// do nothing, just erase it
} else {
new_actions.push_back(alloca_act);
}
} else if (auto bin_act = std::dynamic_pointer_cast<BinaryOperationAction>(act)) {
if (is_an_alias_generated_by_load.find(bin_act->operand1_full) != is_an_alias_generated_by_load.end()) {
bin_act->operand1_full = name_stk.top();
bin_act->operand1_full = is_an_alias_generated_by_load[bin_act->operand1_full];
}
if (is_an_alias_generated_by_load.find(bin_act->operand2_full) != is_an_alias_generated_by_load.end()) {
bin_act->operand2_full = name_stk.top();
bin_act->operand2_full = is_an_alias_generated_by_load[bin_act->operand2_full];
}
new_actions.push_back(bin_act);
} else if (auto load_act = std::dynamic_pointer_cast<LoadAction>(act)) {
if (load_act->ptr_full == origin_var_name) {
if (var_to_version.find(load_act->ptr_full) != var_to_version.end()) {
// remove it
is_an_alias_generated_by_load.insert(load_act->result_full);
is_an_alias_generated_by_load[load_act->result_full] = var_to_name_stk[load_act->ptr_full].top();
} else {
new_actions.push_back(load_act);
}
} else if (auto store_act = std::dynamic_pointer_cast<StoreAction>(act)) {
if (is_an_alias_generated_by_load.find(store_act->value_full) != is_an_alias_generated_by_load.end()) {
store_act->value_full = name_stk.top();
store_act->value_full = is_an_alias_generated_by_load[store_act->value_full];
}
if (store_act->ptr_full == origin_var_name) {
if (var_to_version.find(store_act->ptr_full) != var_to_version.end()) {
// remove it
name_stk.push(store_act->value_full);
versions_pushed++;
var_to_name_stk[store_act->ptr_full].push(store_act->value_full);
var_to_versions_pushed[store_act->ptr_full]++;
} else {
new_actions.push_back(store_act);
}
} else if (auto get_act = std::dynamic_pointer_cast<GetElementPtrAction>(act)) {
new_actions.push_back(get_act);
if (is_an_alias_generated_by_load.find(get_act->ptr_full) != is_an_alias_generated_by_load.end()) {
get_act->ptr_full = name_stk.top();
get_act->ptr_full = is_an_alias_generated_by_load[get_act->ptr_full];
}
for (auto &idx : get_act->indices) {
if (is_an_alias_generated_by_load.find(idx) != is_an_alias_generated_by_load.end()) {
idx = name_stk.top();
idx = is_an_alias_generated_by_load[idx];
}
}
} else if (auto icmp_act = std::dynamic_pointer_cast<ICMPAction>(act)) {
if (is_an_alias_generated_by_load.find(icmp_act->operand1_full) != is_an_alias_generated_by_load.end()) {
icmp_act->operand1_full = name_stk.top();
icmp_act->operand1_full = is_an_alias_generated_by_load[icmp_act->operand1_full];
}
if (is_an_alias_generated_by_load.find(icmp_act->operand2_full) != is_an_alias_generated_by_load.end()) {
icmp_act->operand2_full = name_stk.top();
icmp_act->operand2_full = is_an_alias_generated_by_load[icmp_act->operand2_full];
}
new_actions.push_back(icmp_act);
} else if (auto phi_act = std::dynamic_pointer_cast<PhiItem>(act)) {
new_actions.push_back(phi_act);
for (auto &val : phi_act->values) {
if (is_an_alias_generated_by_load.find(val.first) != is_an_alias_generated_by_load.end()) {
val.first = name_stk.top();
val.first = is_an_alias_generated_by_load[val.first];
}
}
} else if (auto call_act = std::dynamic_pointer_cast<CallItem>(act)) {
for (size_t i = 0; i < call_act->args_val_full.size(); i++) {
if (is_an_alias_generated_by_load.find(call_act->args_val_full[i]) != is_an_alias_generated_by_load.end()) {
call_act->args_val_full[i] = name_stk.top();
call_act->args_val_full[i] = is_an_alias_generated_by_load[call_act->args_val_full[i]];
}
}
new_actions.push_back(call_act);
} else if (auto select_act = std::dynamic_pointer_cast<SelectItem>(act)) {
if (is_an_alias_generated_by_load.find(select_act->cond_full) != is_an_alias_generated_by_load.end()) {
select_act->cond_full = name_stk.top();
select_act->cond_full = is_an_alias_generated_by_load[select_act->cond_full];
}
if (is_an_alias_generated_by_load.find(select_act->true_val_full) != is_an_alias_generated_by_load.end()) {
select_act->true_val_full = name_stk.top();
select_act->true_val_full = is_an_alias_generated_by_load[select_act->true_val_full];
}
if (is_an_alias_generated_by_load.find(select_act->false_val_full) != is_an_alias_generated_by_load.end()) {
select_act->false_val_full = name_stk.top();
select_act->false_val_full = is_an_alias_generated_by_load[select_act->false_val_full];
}
new_actions.push_back(select_act);
} else {
@ -186,36 +189,41 @@ size_t InNodeReplace(CFGNodeType *cur_node, std::string origin_var_name, size_t
}
if (auto br_act = std::dynamic_pointer_cast<BRAction>(cur_block->exit_action)) {
if (is_an_alias_generated_by_load.find(br_act->cond) != is_an_alias_generated_by_load.end()) {
br_act->cond = name_stk.top();
br_act->cond = is_an_alias_generated_by_load[br_act->cond];
}
} else if (auto ret_act = std::dynamic_pointer_cast<RETAction>(cur_block->exit_action)) {
if (is_an_alias_generated_by_load.find(ret_act->value) != is_an_alias_generated_by_load.end()) {
ret_act->value = name_stk.top();
ret_act->value = is_an_alias_generated_by_load[ret_act->value];
}
}
cur_block->actions = new_actions;
return versions_pushed;
return var_to_versions_pushed;
}
void DFSReplace(CFGNodeType *cur_node, std::string origin_var_name, size_t &cur_version,
std::stack<std::string> &name_stk) {
void DFSReplace(CFGNodeType *cur_node, std::unordered_map<std::string, size_t> &var_to_version,
std::unordered_map<std::string, std::stack<std::string>> &var_to_name_stk) {
// std::cerr << "DFSReplace: " << cur_node->corresponding_block->label_full << std::endl;
size_t versions_pushed = 0;
std::unordered_map<std::string, size_t> var_to_version_pushed;
// step 1: process current node
versions_pushed = InNodeReplace(cur_node, origin_var_name, cur_version, name_stk);
var_to_version_pushed = InNodeReplace(cur_node, var_to_version, var_to_name_stk);
// step 2: process the phi commands in the successors in cfg
for (auto succ : cur_node->successors) {
if (succ->corresponding_block->phi_map.find(origin_var_name) != succ->corresponding_block->phi_map.end()) {
auto phi = succ->corresponding_block->phi_map[origin_var_name];
phi->values.push_back(std::make_pair(name_stk.top(), cur_node->corresponding_block->label_full));
for (auto [origin_var_name, _] : var_to_version) {
for (auto succ : cur_node->successors) {
if (succ->corresponding_block->phi_map.find(origin_var_name) != succ->corresponding_block->phi_map.end()) {
auto phi = succ->corresponding_block->phi_map[origin_var_name];
phi->values.push_back(
std::make_pair(var_to_name_stk[origin_var_name].top(), cur_node->corresponding_block->label_full));
}
}
}
// step 3: process the successors in dom tree
for (auto succ : cur_node->successors_in_dom_tree) {
DFSReplace(succ, origin_var_name, cur_version, name_stk);
DFSReplace(succ, var_to_version, var_to_name_stk);
}
// step 4: restore the stack
for (size_t i = 0; i < versions_pushed; i++) {
name_stk.pop();
for (auto [var, version_pushed] : var_to_version_pushed) {
for (size_t i = 0; i < version_pushed; i++) {
var_to_name_stk[var].pop();
}
}
}
void ConductMem2RegForFunction(const std::shared_ptr<FunctionDefItem> &func, const CFGType &cfg) {
@ -232,23 +240,27 @@ void ConductMem2RegForFunction(const std::shared_ptr<FunctionDefItem> &func, con
}
}
}
std::unordered_map<std::string, std::vector<CFGNodeType *>> var_to_def_sites;
std::unordered_map<std::string, std::unordered_set<CFGNodeType *>> var_to_def_sites;
for (auto node : cfg.nodes) {
for (auto act : node->corresponding_block->actions) {
if (auto store_act = std::dynamic_pointer_cast<StoreAction>(act)) {
if (var_to_version.find(store_act->ptr_full) != var_to_version.end()) {
var_to_def_sites[store_act->ptr_full].push_back(node.get());
break;
var_to_def_sites[store_act->ptr_full].insert(node.get());
// break;
}
}
}
}
for (const auto &var : all_local_vars) {
// std::cerr << "now consider var: " << var << std::endl;
size_t &cur_version = var_to_version[var];
std::queue<CFGNodeType *> Q;
// std::cerr << "\tdef sites:";
for (auto def_site : var_to_def_sites[var]) {
Q.push(def_site);
// std::cerr << ' ' << def_site->corresponding_block->label_full;
}
// std::cerr << std::endl;
while (Q.size() > 0) {
CFGNodeType *cur_node = Q.front();
Q.pop();
@ -262,13 +274,16 @@ void ConductMem2RegForFunction(const std::shared_ptr<FunctionDefItem> &func, con
}
}
}
std::unordered_map<std::string, std::stack<std::string>> var_to_name_stk;
for (const auto &var : all_local_vars) {
size_t &cur_version = var_to_version[var];
std::stack<std::string> name_stk;
name_stk.push("0");
// std::cerr << "processing " << var << std::endl;
DFSReplace(cfg.entry, var, cur_version, name_stk);
var_to_name_stk[var] = std::stack<std::string>();
if (std::holds_alternative<LLVMIRPTRType>(var_to_type[var])) {
var_to_name_stk[var].push("null");
} else {
var_to_name_stk[var].push("0");
}
}
DFSReplace(cfg.entry, var_to_version, var_to_name_stk);
}
std::shared_ptr<ModuleItem> Mem2Reg(std::shared_ptr<ModuleItem> src) {
// auto res = std::make_shared<ModuleItem>(*src);