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// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <string>
#include <tuple>
#include "shader_recompiler/backend/bindings.h"
#include "shader_recompiler/backend/glasm/emit_context.h"
#include "shader_recompiler/backend/glasm/emit_glasm.h"
#include "shader_recompiler/backend/glasm/emit_glasm_instructions.h"
#include "shader_recompiler/frontend/ir/program.h"
#include "shader_recompiler/profile.h"
namespace Shader::Backend::GLASM {
namespace {
template <class Func>
struct FuncTraits {};
template <class ReturnType_, class... Args>
struct FuncTraits<ReturnType_ (*)(Args...)> {
using ReturnType = ReturnType_;
static constexpr size_t NUM_ARGS = sizeof...(Args);
template <size_t I>
using ArgType = std::tuple_element_t<I, std::tuple<Args...>>;
};
template <typename T>
struct Identity {
Identity(const T& data_) : data{data_} {}
const T& Extract() {
return data;
}
T data;
};
template <bool scalar>
struct RegWrapper {
RegWrapper(EmitContext& ctx, Value value)
: reg_alloc{ctx.reg_alloc}, allocated{value.type != Type::Register} {
reg = allocated ? reg_alloc.AllocReg() : Register{value};
switch (value.type) {
case Type::Register:
break;
case Type::U32:
ctx.Add("MOV.U {}.x,{};", reg, value.imm_u32);
break;
case Type::S32:
ctx.Add("MOV.S {}.x,{};", reg, value.imm_s32);
break;
case Type::F32:
ctx.Add("MOV.F {}.x,{};", reg, value.imm_f32);
break;
}
}
~RegWrapper() {
if (allocated) {
reg_alloc.FreeReg(reg);
}
}
auto Extract() {
return std::conditional_t<scalar, ScalarRegister, Register>{Value{reg}};
}
RegAlloc& reg_alloc;
Register reg{};
bool allocated{};
};
template <typename ArgType>
auto Arg(EmitContext& ctx, const IR::Value& arg) {
if constexpr (std::is_same_v<ArgType, Register>) {
return RegWrapper<false>{ctx, ctx.reg_alloc.Consume(arg)};
} else if constexpr (std::is_same_v<ArgType, ScalarRegister>) {
return RegWrapper<true>{ctx, ctx.reg_alloc.Consume(arg)};
} else if constexpr (std::is_base_of_v<Value, ArgType>) {
return Identity{ArgType{ctx.reg_alloc.Consume(arg)}};
} else if constexpr (std::is_same_v<ArgType, const IR::Value&>) {
return Identity{arg};
} else if constexpr (std::is_same_v<ArgType, u32>) {
return Identity{arg.U32()};
} else if constexpr (std::is_same_v<ArgType, IR::Block*>) {
return Identity{arg.Label()};
} else if constexpr (std::is_same_v<ArgType, IR::Attribute>) {
return Identity{arg.Attribute()};
} else if constexpr (std::is_same_v<ArgType, IR::Patch>) {
return Identity{arg.Patch()};
} else if constexpr (std::is_same_v<ArgType, IR::Reg>) {
return Identity{arg.Reg()};
}
}
template <auto func, bool is_first_arg_inst, typename... Args>
void InvokeCall(EmitContext& ctx, IR::Inst* inst, Args&&... args) {
if constexpr (is_first_arg_inst) {
func(ctx, *inst, std::forward<Args>(args.Extract())...);
} else {
func(ctx, std::forward<Args>(args.Extract())...);
}
}
template <auto func, bool is_first_arg_inst, size_t... I>
void Invoke(EmitContext& ctx, IR::Inst* inst, std::index_sequence<I...>) {
using Traits = FuncTraits<decltype(func)>;
if constexpr (is_first_arg_inst) {
func(ctx, *inst,
Arg<typename Traits::template ArgType<I + 2>>(ctx, inst->Arg(I)).Extract()...);
} else {
func(ctx, Arg<typename Traits::template ArgType<I + 1>>(ctx, inst->Arg(I)).Extract()...);
}
}
template <auto func>
void Invoke(EmitContext& ctx, IR::Inst* inst) {
using Traits = FuncTraits<decltype(func)>;
static_assert(Traits::NUM_ARGS >= 1, "Insufficient arguments");
if constexpr (Traits::NUM_ARGS == 1) {
Invoke<func, false>(ctx, inst, std::make_index_sequence<0>{});
} else {
using FirstArgType = typename Traits::template ArgType<1>;
static constexpr bool is_first_arg_inst = std::is_same_v<FirstArgType, IR::Inst&>;
using Indices = std::make_index_sequence<Traits::NUM_ARGS - (is_first_arg_inst ? 2 : 1)>;
Invoke<func, is_first_arg_inst>(ctx, inst, Indices{});
}
}
void EmitInst(EmitContext& ctx, IR::Inst* inst) {
switch (inst->GetOpcode()) {
#define OPCODE(name, result_type, ...) \
case IR::Opcode::name: \
return Invoke<&Emit##name>(ctx, inst);
#include "shader_recompiler/frontend/ir/opcodes.inc"
#undef OPCODE
}
throw LogicError("Invalid opcode {}", inst->GetOpcode());
}
} // Anonymous namespace
std::string EmitGLASM(const Profile&, IR::Program& program, Bindings&) {
EmitContext ctx{program};
for (IR::Block* const block : program.blocks) {
for (IR::Inst& inst : block->Instructions()) {
EmitInst(ctx, &inst);
}
}
std::string header = "!!NVcp5.0\n"
"OPTION NV_internal;";
switch (program.stage) {
case Stage::Compute:
header += fmt::format("GROUP_SIZE {} {} {};", program.workgroup_size[0],
program.workgroup_size[1], program.workgroup_size[2]);
break;
default:
break;
}
header += "TEMP ";
for (size_t index = 0; index < ctx.reg_alloc.NumUsedRegisters(); ++index) {
header += fmt::format("R{},", index);
}
header += "RC;";
if (!program.info.storage_buffers_descriptors.empty()) {
header += "LONG TEMP LC;";
}
ctx.code.insert(0, header);
ctx.code += "END";
return ctx.code;
}
} // namespace Shader::Backend::GLASM
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