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// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <bitset>
#include "common/bit_field.h"
#include "common/common_types.h"
namespace Shader::IR {
class Inst;
class Value;
} // namespace Shader::IR
namespace Shader::Backend::GLSL {
enum class Type : u32 {
U32,
S32,
F32,
U64,
F64,
Void,
};
struct Id {
union {
u32 raw;
BitField<0, 29, u32> index;
BitField<29, 1, u32> is_long;
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));
class RegAlloc {
public:
std::string Define(IR::Inst& inst, Type type = Type::Void);
std::string Consume(const IR::Value& value);
/// Returns true if the instruction is expected to be aliased to another
static bool IsAliased(const IR::Inst& inst);
/// Returns the underlying value out of an alias sequence
static IR::Inst& AliasInst(IR::Inst& inst);
private:
static constexpr size_t NUM_REGS = 4096;
static constexpr size_t NUM_ELEMENTS = 4;
std::string Consume(IR::Inst& inst);
std::string GetType(Type type, u32 index);
Id Alloc();
void Free(Id id);
size_t num_used_registers{};
std::bitset<NUM_REGS> register_use{};
std::bitset<NUM_REGS> register_defined{};
};
} // namespace Shader::Backend::GLSL
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