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optimize for compile time

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This commit is contained in:
ZhuangYumin
2024-10-22 15:00:40 +00:00
parent 101c181c75
commit ba2ee1c5f6
7 changed files with 409 additions and 364 deletions
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370
include/opt/gen.h
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@ -121,368 +121,16 @@ void GenerateOptASM(std::ostream &os, std::shared_ptr<ModuleItem> prog);
extern std::string cur_block_label_for_phi;
inline std::string AllocateTmpReg(std::vector<std::string> &available_tmp_regs) {
if (available_tmp_regs.size() == 0) throw std::runtime_error("No available tmp register");
std::string res;
res = available_tmp_regs.back();
available_tmp_regs.pop_back();
return res;
}
std::string AllocateTmpReg(std::vector<std::string> &available_tmp_regs);
inline std::string ExtractRegName(const std::string &raw) {
if (raw[0] != '$') throw std::runtime_error("Not a register");
size_t reg_id = std::stoull(raw.substr(5));
return "x" + std::to_string(reg_id);
}
std::string ExtractRegName(const std::string &raw);
inline void FetchValueToReg(std::string original_val, std::string &out_reg, FuncLayout &layout,
std::vector<std::string> &code_lines, std::vector<std::string> &available_tmp_regs) {
if (original_val[0] == '$') {
// already assigned to a register, such as `$reg.10`
out_reg = ExtractRegName(original_val);
} else if (original_val[0] == '#') {
// spilled variable, we need find it in the layout
size_t offset = layout.QueryOffeset(original_val);
out_reg = AllocateTmpReg(available_tmp_regs);
if (offset < 2048) {
code_lines.push_back("lw " + out_reg + ", -" + std::to_string(offset) + "(s0)");
} else {
code_lines.push_back("li " + out_reg + ", -" + std::to_string(offset));
code_lines.push_back("add " + out_reg + ", s0, " + out_reg);
code_lines.push_back("lw " + out_reg + ", 0(" + out_reg + ")");
}
} else if (original_val[0] == '@') {
// global variable address keeper
out_reg = AllocateTmpReg(available_tmp_regs);
std::string label_in_asm = original_val.substr(1, original_val.size() - 1);
code_lines.push_back("la " + out_reg + ", " + label_in_asm);
} else if (original_val[0] == '-' || std::isdigit(original_val[0])) {
// immediate value
out_reg = AllocateTmpReg(available_tmp_regs);
StoreImmToReg(std::stoi(original_val), out_reg, code_lines);
} else if (original_val == "null") {
out_reg = "x0";
} else {
throw std::runtime_error("Unknown value type");
}
}
void FetchValueToReg(std::string original_val, std::string &out_reg, FuncLayout &layout,
std::vector<std::string> &code_lines, std::vector<std::string> &available_tmp_regs);
inline void WriteToSpilledVar(std::string val, std::string reg, FuncLayout &layout,
std::vector<std::string> &code_lines, std::vector<std::string> &available_tmp_regs) {
if (val[0] != '#') throw std::runtime_error("Not a spilled variable");
size_t offset = layout.QueryOffeset(val);
if (offset < 2048) {
code_lines.push_back("sw " + reg + ", -" + std::to_string(offset) + "(s0)");
} else {
std::string tmp_reg = AllocateTmpReg(available_tmp_regs);
code_lines.push_back("li " + tmp_reg + ", -" + std::to_string(offset));
code_lines.push_back("add " + tmp_reg + ", s0, " + tmp_reg);
code_lines.push_back("sw " + reg + ", 0(" + tmp_reg + ")");
}
}
inline size_t CalcSize(const LLVMType &tp) {
if (std::holds_alternative<LLVMIRIntType>(tp)) {
auto &int_tp = std::get<LLVMIRIntType>(tp);
return (int_tp.bits + 7) / 8;
} else if (std::holds_alternative<LLVMIRPTRType>(tp)) {
return 4;
} else if (std::holds_alternative<LLVMVOIDType>(tp)) {
throw std::runtime_error("Cannot calculate size of void type");
return 0;
} else if (std::holds_alternative<LLVMIRCLASSTYPE>(tp)) {
throw std::runtime_error("Cannot calculate size of class type");
} else
throw std::runtime_error("Unknown type");
}
inline void GenerateASM(std::shared_ptr<ActionItem> act, std::vector<std::string> &code_lines, FuncLayout &layout,
const std::unordered_map<std::string, IRClassInfo> &low_level_class_info) {
std::vector<std::string> available_tmp_regs = held_tmp_regs;
if (auto br_act = std::dynamic_pointer_cast<BRAction>(act)) {
std::string cond_reg;
FetchValueToReg(br_act->cond, cond_reg, layout, code_lines, available_tmp_regs);
code_lines.push_back("bnez " + cond_reg + ", .entrylabel." + br_act->true_label_full);
code_lines.push_back("j .entrylabel." + br_act->false_label_full);
} else if (auto jmp_act = std::dynamic_pointer_cast<UNConditionJMPAction>(act)) {
code_lines.push_back("j .entrylabel." + jmp_act->label_full);
} else if (auto ret_act = std::dynamic_pointer_cast<RETAction>(act)) {
code_lines.push_back("lw ra, -4(s0)");
code_lines.push_back("lw sp, -12(s0)");
code_lines.push_back("lw s0, -8(s0)");
code_lines.push_back("ret");
} else if (auto binary_act = std::dynamic_pointer_cast<BinaryOperationAction>(act)) {
// size_t sz = CalcSize(binary_act->type);
// IRVar2RISCVReg(binary_act->operand1_full, sz, "t0", layout, code_lines);
// IRVar2RISCVReg(binary_act->operand2_full, sz, "t1", layout, code_lines);
std::string operand1_reg, operand2_reg;
FetchValueToReg(binary_act->operand1_full, operand1_reg, layout, code_lines, available_tmp_regs);
FetchValueToReg(binary_act->operand2_full, operand2_reg, layout, code_lines, available_tmp_regs);
std::string res_reg;
bool need_extra_store = false;
if (binary_act->result_full[0] == '$') {
res_reg = ExtractRegName(binary_act->result_full);
} else if (binary_act->result_full[0] == '#') {
need_extra_store = true;
res_reg = AllocateTmpReg(available_tmp_regs);
} else {
throw std::runtime_error("Unknown result type");
}
if (binary_act->op == "add") {
code_lines.push_back("add " + res_reg + ", " + operand1_reg + ", " + operand2_reg);
} else if (binary_act->op == "sub") {
code_lines.push_back("sub " + res_reg + ", " + operand1_reg + ", " + operand2_reg);
} else if (binary_act->op == "mul") {
code_lines.push_back("mul " + res_reg + ", " + operand1_reg + ", " + operand2_reg);
} else if (binary_act->op == "sdiv") {
code_lines.push_back("div " + res_reg + ", " + operand1_reg + ", " + operand2_reg);
} else if (binary_act->op == "srem") {
code_lines.push_back("rem " + res_reg + ", " + operand1_reg + ", " + operand2_reg);
} else if (binary_act->op == "and") {
code_lines.push_back("and " + res_reg + ", " + operand1_reg + ", " + operand2_reg);
} else if (binary_act->op == "or") {
code_lines.push_back("or " + res_reg + ", " + operand1_reg + ", " + operand2_reg);
} else if (binary_act->op == "xor") {
code_lines.push_back("xor " + res_reg + ", " + operand1_reg + ", " + operand2_reg);
} else if (binary_act->op == "shl") {
code_lines.push_back("sll " + res_reg + ", " + operand1_reg + ", " + operand2_reg);
} else if (binary_act->op == "ashr") {
code_lines.push_back("sra " + res_reg + ", " + operand1_reg + ", " + operand2_reg);
} else {
throw std::runtime_error("Unknown binary operation");
}
if (need_extra_store) {
WriteToSpilledVar(binary_act->result_full, res_reg, layout, code_lines, available_tmp_regs);
}
} else if (auto alloca_act = std::dynamic_pointer_cast<AllocaAction>(act)) {
std::string res_reg;
bool need_extra_store = false;
if (alloca_act->name_full[0] == '#') {
need_extra_store = true;
res_reg = AllocateTmpReg(available_tmp_regs);
} else if (alloca_act->name_full[0] == '$') {
res_reg = ExtractRegName(alloca_act->name_full);
} else {
throw std::runtime_error("Unknown result type");
}
size_t sz = CalcSize(alloca_act->type) * alloca_act->num;
sz = (sz + 15) / 16 * 16;
code_lines.push_back("addi sp, sp, -" + std::to_string(sz));
if (!need_extra_store) {
code_lines.push_back("mv " + res_reg + ", sp");
} else {
WriteToSpilledVar(alloca_act->name_full, "sp", layout, code_lines, available_tmp_regs);
}
} else if (auto load_act = std::dynamic_pointer_cast<LoadAction>(act)) {
std::string res_reg;
bool need_extra_store = false;
if (load_act->result_full[0] == '#') {
need_extra_store = true;
res_reg = AllocateTmpReg(available_tmp_regs);
} else if (load_act->result_full[0] == '$') {
res_reg = ExtractRegName(load_act->result_full);
} else {
throw std::runtime_error("Unknown result type");
}
std::string ptr_reg;
FetchValueToReg(load_act->ptr_full, ptr_reg, layout, code_lines, available_tmp_regs);
if (CalcSize(load_act->ty) == 4) {
code_lines.push_back("lw " + res_reg + ", 0(" + ptr_reg + ")");
} else if (CalcSize(load_act->ty) == 1) {
code_lines.push_back("lb " + res_reg + ", 0(" + ptr_reg + ")");
} else {
throw std::runtime_error("Unknown bytes");
}
if (need_extra_store) {
WriteToSpilledVar(load_act->result_full, res_reg, layout, code_lines, available_tmp_regs);
}
} else if (auto store_act = std::dynamic_pointer_cast<StoreAction>(act)) {
std::string val_reg;
std::string ptr_reg;
FetchValueToReg(store_act->value_full, val_reg, layout, code_lines, available_tmp_regs);
FetchValueToReg(store_act->ptr_full, ptr_reg, layout, code_lines, available_tmp_regs);
if (CalcSize(store_act->ty) == 4) {
code_lines.push_back("sw " + val_reg + ", 0(" + ptr_reg + ")");
} else if (CalcSize(store_act->ty) == 1) {
code_lines.push_back("sb " + val_reg + ", 0(" + ptr_reg + ")");
} else {
throw std::runtime_error("Unknown bytes");
}
} else if (auto get_element_act = std::dynamic_pointer_cast<GetElementPtrAction>(act)) {
if (get_element_act->indices.size() == 1) {
// array access
std::string res_reg;
bool need_extra_store = false;
if (get_element_act->result_full[0] == '#') {
need_extra_store = true;
res_reg = AllocateTmpReg(available_tmp_regs);
} else if (get_element_act->result_full[0] == '$') {
res_reg = ExtractRegName(get_element_act->result_full);
} else {
throw std::runtime_error("Unknown result type");
}
std::string ptr_reg;
std::string idx_reg;
FetchValueToReg(get_element_act->ptr_full, ptr_reg, layout, code_lines, available_tmp_regs);
FetchValueToReg(get_element_act->indices[0], idx_reg, layout, code_lines, available_tmp_regs);
std::string tmp_reg = AllocateTmpReg(available_tmp_regs);
size_t element_sz = CalcSize(get_element_act->ty);
code_lines.push_back("slli " + tmp_reg + ", " + idx_reg + ", " + std::to_string(std::countr_zero(element_sz)));
code_lines.push_back("add " + res_reg + ", " + ptr_reg + ", " + tmp_reg);
if (need_extra_store) {
WriteToSpilledVar(get_element_act->result_full, res_reg, layout, code_lines, available_tmp_regs);
}
} else if (get_element_act->indices.size() == 2) {
// // struct access
if (get_element_act->indices[0] != "0") {
throw std::runtime_error("struct access with non-zero offset is not supported");
}
size_t element_idx = std::stoull(get_element_act->indices[1]);
auto class_ty = std::get<LLVMIRCLASSTYPE>(get_element_act->ty);
const IRClassInfo &class_info = low_level_class_info.at(class_ty.class_name_full);
size_t offset = class_info.member_var_pos_after_align[element_idx];
std::string res_reg;
bool need_extra_store = false;
if (get_element_act->result_full[0] == '#') {
need_extra_store = true;
res_reg = AllocateTmpReg(available_tmp_regs);
} else if (get_element_act->result_full[0] == '$') {
res_reg = ExtractRegName(get_element_act->result_full);
} else {
throw std::runtime_error("Unknown result type");
}
std::string base_ptr_reg;
FetchValueToReg(get_element_act->ptr_full, base_ptr_reg, layout, code_lines, available_tmp_regs);
if (offset < 2048) {
code_lines.push_back("addi " + res_reg + ", " + base_ptr_reg + ", " + std::to_string(offset));
} else {
std::string tmp_reg = AllocateTmpReg(available_tmp_regs);
code_lines.push_back("li " + tmp_reg + ", " + std::to_string(offset));
code_lines.push_back("add " + res_reg + ", " + base_ptr_reg + ", " + tmp_reg);
}
if (need_extra_store) {
WriteToSpilledVar(get_element_act->result_full, res_reg, layout, code_lines, available_tmp_regs);
}
} else {
throw std::runtime_error("Unknown getelementptr indices size");
}
} else if (auto icmp_act = std::dynamic_pointer_cast<ICMPAction>(act)) {
std::string operand1_reg, operand2_reg;
FetchValueToReg(icmp_act->operand1_full, operand1_reg, layout, code_lines, available_tmp_regs);
FetchValueToReg(icmp_act->operand2_full, operand2_reg, layout, code_lines, available_tmp_regs);
std::string res_reg;
bool need_extra_store = false;
if (icmp_act->result_full[0] == '#') {
need_extra_store = true;
res_reg = AllocateTmpReg(available_tmp_regs);
} else if (icmp_act->result_full[0] == '$') {
res_reg = ExtractRegName(icmp_act->result_full);
} else {
throw std::runtime_error("Unknown result type");
}
std::string tmp_reg = AllocateTmpReg(available_tmp_regs);
if (icmp_act->op == "eq") {
// code_lines.push_back("xor t2, t0, t1");
// code_lines.push_back("seqz t2, t2");
code_lines.push_back("xor " + tmp_reg + ", " + operand1_reg + ", " + operand2_reg);
code_lines.push_back("seqz " + res_reg + ", " + tmp_reg);
} else if (icmp_act->op == "ne") {
// code_lines.push_back("xor t2, t0, t1");
// code_lines.push_back("snez t2, t2");
code_lines.push_back("xor " + tmp_reg + ", " + operand1_reg + ", " + operand2_reg);
code_lines.push_back("snez " + res_reg + ", " + tmp_reg);
} else if (icmp_act->op == "slt") {
// code_lines.push_back("slt t2, t0, t1");
code_lines.push_back("slt " + res_reg + ", " + operand1_reg + ", " + operand2_reg);
} else if (icmp_act->op == "sle") {
// code_lines.push_back("slt t2, t1, t0");
// code_lines.push_back("xori t2, t2, 1");
code_lines.push_back("slt " + res_reg + ", " + operand2_reg + ", " + operand1_reg);
code_lines.push_back("xori " + res_reg + ", " + res_reg + ", 1");
} else if (icmp_act->op == "sgt") {
// code_lines.push_back("slt t2, t1, t0");
code_lines.push_back("slt " + res_reg + ", " + operand2_reg + ", " + operand1_reg);
} else if (icmp_act->op == "sge") {
// code_lines.push_back("slt t2, t0, t1");
// code_lines.push_back("xori t2, t2, 1");
code_lines.push_back("slt " + res_reg + ", " + operand1_reg + ", " + operand2_reg);
code_lines.push_back("xori " + res_reg + ", " + res_reg + ", 1");
} else {
throw std::runtime_error("Unknown icmp operation");
}
if (need_extra_store) {
WriteToSpilledVar(icmp_act->result_full, res_reg, layout, code_lines, available_tmp_regs);
}
} else if (auto call_act = std::dynamic_pointer_cast<CallItem>(act)) {
// no need to to further process, as callling convention is handled in reg alloc
code_lines.push_back("call " + call_act->func_name_raw);
if (call_act->move_sp_up) {
size_t delta = 4 * call_act->move_sp_up;
code_lines.push_back("addi sp, sp, " + std::to_string(delta));
}
} else if (auto phi_act = std::dynamic_pointer_cast<PhiItem>(act)) {
throw std::runtime_error("Phi should not be in the layout");
} else if (auto select_act = std::dynamic_pointer_cast<SelectItem>(act)) {
std::string res_reg;
bool need_extra_store = false;
if (select_act->result_full[0] == '#') {
need_extra_store = true;
res_reg = AllocateTmpReg(available_tmp_regs);
} else if (select_act->result_full[0] == '$') {
res_reg = ExtractRegName(select_act->result_full);
} else {
throw std::runtime_error("Unknown result type");
}
std::string operand1_reg, operand2_reg, cond_reg;
FetchValueToReg(select_act->cond_full, cond_reg, layout, code_lines, available_tmp_regs);
FetchValueToReg(select_act->true_val_full, operand1_reg, layout, code_lines, available_tmp_regs);
FetchValueToReg(select_act->false_val_full, operand2_reg, layout, code_lines, available_tmp_regs);
std::string tmp1_reg = AllocateTmpReg(available_tmp_regs);
std::string tmp2_reg = AllocateTmpReg(available_tmp_regs);
code_lines.push_back("slli " + tmp1_reg + ", " + cond_reg + ", 31");
code_lines.push_back("srai " + tmp1_reg + ", " + tmp1_reg + ", 31");
code_lines.push_back("xor " + tmp2_reg + ", " + operand1_reg + ", " + operand2_reg);
code_lines.push_back("and " + tmp2_reg + ", " + tmp2_reg + ", " + tmp1_reg);
code_lines.push_back("xor " + res_reg + ", " + tmp2_reg + ", " + operand2_reg);
if (need_extra_store) {
WriteToSpilledVar(select_act->result_full, res_reg, layout, code_lines, available_tmp_regs);
}
} else if (auto load_spilled_args_act = std::dynamic_pointer_cast<opt::LoadSpilledArgs>(act)) {
std::string res_reg;
bool need_extra_store = false;
if (load_spilled_args_act->var_full[0] == '$') {
res_reg = ExtractRegName(load_spilled_args_act->var_full);
} else if (load_spilled_args_act->var_full[0] == '#') {
need_extra_store = true;
res_reg = AllocateTmpReg(available_tmp_regs);
} else {
throw std::runtime_error("Unknown result type");
}
size_t offset = 4 * (load_spilled_args_act->arg_id - 8);
code_lines.push_back("lw " + res_reg + ", " + std::to_string(offset) + "(s0)");
if (need_extra_store) {
WriteToSpilledVar(load_spilled_args_act->var_full, res_reg, layout, code_lines, available_tmp_regs);
}
} else if (auto store_spilled_args_act = std::dynamic_pointer_cast<opt::StoreSpilledArgs>(act)) {
if (store_spilled_args_act->move_sp_down) {
size_t delta = 4 * store_spilled_args_act->move_sp_down;
code_lines.push_back("addi sp, sp, -" + std::to_string(delta));
}
std::string val_reg;
FetchValueToReg(store_spilled_args_act->var_full, val_reg, layout, code_lines, available_tmp_regs);
size_t offset = 4 * (store_spilled_args_act->arg_id - 8);
code_lines.push_back("sw " + val_reg + ", " + std::to_string(offset) + "(sp)");
} else if (auto move_act = std::dynamic_pointer_cast<opt::MoveInstruct>(act)) {
std::string src_reg;
FetchValueToReg(move_act->src_full, src_reg, layout, code_lines, available_tmp_regs);
if (move_act->dest_full[0] == '$') {
std::string dest_reg = ExtractRegName(move_act->dest_full);
code_lines.push_back("mv " + dest_reg + ", " + src_reg);
} else if (move_act->dest_full[0] == '#') {
WriteToSpilledVar(move_act->dest_full, src_reg, layout, code_lines, available_tmp_regs);
} else {
throw std::runtime_error("Unknown dest type");
}
} else {
throw std::runtime_error("Unknown action type");
}
}
void WriteToSpilledVar(std::string val, std::string reg, FuncLayout &layout, std::vector<std::string> &code_lines,
std::vector<std::string> &available_tmp_regs);
size_t CalcSize(const LLVMType &tp);
void GenerateASM(std::shared_ptr<ActionItem> act, std::vector<std::string> &code_lines, FuncLayout &layout,
const std::unordered_map<std::string, IRClassInfo> &low_level_class_info);
} // namespace OptBackend