// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <bitset>
#include <fmt/format.h>
#include "common/bit_cast.h"
#include "common/bit_field.h"
#include "common/common_types.h"
#include "shader_recompiler/exception.h"
namespace Shader::IR {
class Inst;
class Value;
} // namespace Shader::IR
namespace Shader::Backend::GLASM {
class EmitContext;
enum class Type : u32 {
Register,
U32,
S32,
F32,
};
struct Id {
union {
u32 raw;
BitField<0, 30, u32> index;
BitField<30, 1, u32> is_spill;
BitField<31, 1, u32> is_condition_code;
};
bool operator==(Id rhs) const noexcept {
return raw == rhs.raw;
}
bool operator!=(Id rhs) const noexcept {
return !operator==(rhs);
}
};
static_assert(sizeof(Id) == sizeof(u32));
struct Value {
Type type;
union {
Id id;
u32 imm_u32;
s32 imm_s32;
f32 imm_f32;
};
bool operator==(const Value& rhs) const noexcept {
if (type != rhs.type) {
return false;
}
switch (type) {
case Type::Register:
return id == rhs.id;
case Type::U32:
return imm_u32 == rhs.imm_u32;
case Type::S32:
return imm_s32 == rhs.imm_s32;
case Type::F32:
return Common::BitCast<u32>(imm_f32) == Common::BitCast<u32>(rhs.imm_f32);
}
return false;
}
bool operator!=(const Value& rhs) const noexcept {
return !operator==(rhs);
}
};
struct Register : Value {};
struct ScalarRegister : Value {};
struct ScalarU32 : Value {};
struct ScalarS32 : Value {};
struct ScalarF32 : Value {};
class RegAlloc {
public:
RegAlloc(EmitContext& ctx_) : ctx{ctx_} {}
Register Define(IR::Inst& inst);
Value Consume(const IR::Value& value);
Register AllocReg();
void FreeReg(Register reg);
[[nodiscard]] size_t NumUsedRegisters() const noexcept {
return num_used_registers;
}
private:
static constexpr size_t NUM_REGS = 4096;
static constexpr size_t NUM_ELEMENTS = 4;
Value Consume(IR::Inst& inst);
Id Alloc();
void Free(Id id);
EmitContext& ctx;
size_t num_used_registers{};
std::bitset<NUM_REGS> register_use{};
};
template <bool scalar, typename FormatContext>
auto FormatTo(FormatContext& ctx, Id id) {
if (id.is_condition_code != 0) {
throw NotImplementedException("Condition code emission");
}
if (id.is_spill != 0) {
throw NotImplementedException("Spill emission");
}
if constexpr (scalar) {
return fmt::format_to(ctx.out(), "R{}.x", id.index.Value());
} else {
return fmt::format_to(ctx.out(), "R{}", id.index.Value());
}
}
} // namespace Shader::Backend::GLASM
template <>
struct fmt::formatter<Shader::Backend::GLASM::Id> {
constexpr auto parse(format_parse_context& ctx) {
return ctx.begin();
}
template <typename FormatContext>
auto format(Shader::Backend::GLASM::Id id, FormatContext& ctx) {
return Shader::Backend::GLASM::FormatTo<true>(ctx, id);
}
};
template <>
struct fmt::formatter<Shader::Backend::GLASM::Register> {
constexpr auto parse(format_parse_context& ctx) {
return ctx.begin();
}
template <typename FormatContext>
auto format(const Shader::Backend::GLASM::Register& value, FormatContext& ctx) {
if (value.type != Shader::Backend::GLASM::Type::Register) {
throw Shader::InvalidArgument("Register value type is not register");
}
return Shader::Backend::GLASM::FormatTo<false>(ctx, value.id);
}
};
template <>
struct fmt::formatter<Shader::Backend::GLASM::ScalarRegister> {
constexpr auto parse(format_parse_context& ctx) {
return ctx.begin();
}
template <typename FormatContext>
auto format(const Shader::Backend::GLASM::ScalarRegister& value, FormatContext& ctx) {
if (value.type != Shader::Backend::GLASM::Type::Register) {
throw Shader::InvalidArgument("Register value type is not register");
}
return Shader::Backend::GLASM::FormatTo<true>(ctx, value.id);
}
};
template <>
struct fmt::formatter<Shader::Backend::GLASM::ScalarU32> {
constexpr auto parse(format_parse_context& ctx) {
return ctx.begin();
}
template <typename FormatContext>
auto format(const Shader::Backend::GLASM::ScalarU32& value, FormatContext& ctx) {
switch (value.type) {
case Shader::Backend::GLASM::Type::Register:
return Shader::Backend::GLASM::FormatTo<true>(ctx, value.id);
case Shader::Backend::GLASM::Type::U32:
return fmt::format_to(ctx.out(), "{}", value.imm_u32);
case Shader::Backend::GLASM::Type::S32:
return fmt::format_to(ctx.out(), "{}", static_cast<u32>(value.imm_s32));
case Shader::Backend::GLASM::Type::F32:
return fmt::format_to(ctx.out(), "{}", Common::BitCast<u32>(value.imm_f32));
}
throw Shader::InvalidArgument("Invalid value type {}", value.type);
}
};
template <>
struct fmt::formatter<Shader::Backend::GLASM::ScalarS32> {
constexpr auto parse(format_parse_context& ctx) {
return ctx.begin();
}
template <typename FormatContext>
auto format(const Shader::Backend::GLASM::ScalarS32& value, FormatContext& ctx) {
switch (value.type) {
case Shader::Backend::GLASM::Type::Register:
return Shader::Backend::GLASM::FormatTo<true>(ctx, value.id);
case Shader::Backend::GLASM::Type::U32:
return fmt::format_to(ctx.out(), "{}", static_cast<s32>(value.imm_u32));
case Shader::Backend::GLASM::Type::S32:
return fmt::format_to(ctx.out(), "{}", value.imm_s32);
case Shader::Backend::GLASM::Type::F32:
return fmt::format_to(ctx.out(), "{}", Common::BitCast<s32>(value.imm_f32));
}
throw Shader::InvalidArgument("Invalid value type {}", value.type);
}
};
template <>
struct fmt::formatter<Shader::Backend::GLASM::ScalarF32> {
constexpr auto parse(format_parse_context& ctx) {
return ctx.begin();
}
template <typename FormatContext>
auto format(const Shader::Backend::GLASM::ScalarF32& value, FormatContext& ctx) {
switch (value.type) {
case Shader::Backend::GLASM::Type::Register:
return Shader::Backend::GLASM::FormatTo<true>(ctx, value.id);
case Shader::Backend::GLASM::Type::U32:
return fmt::format_to(ctx.out(), "{}", Common::BitCast<u32>(value.imm_u32));
case Shader::Backend::GLASM::Type::S32:
return fmt::format_to(ctx.out(), "{}", Common::BitCast<s32>(value.imm_s32));
case Shader::Backend::GLASM::Type::F32:
return fmt::format_to(ctx.out(), "{}", value.imm_f32);
}
throw Shader::InvalidArgument("Invalid value type {}", value.type);
}
};
