glsl: Rework variable allocator to allow for variable reuse

1 files changed, 0 insertions, 191 deletions

diff --git a/src/shader_recompiler/backend/glsl/reg_alloc.cpp b/src/shader_recompiler/backend/glsl/reg_alloc.cpp
deleted file mode 100644
index b1de022d4..000000000
--- a/src/shader_recompiler/backend/glsl/reg_alloc.cpp
+++ /dev/null
@@ -1,191 +0,0 @@
-// Copyright 2021 yuzu Emulator Project
-// Licensed under GPLv2 or any later version
-// Refer to the license.txt file included.
-
-#include <string>
-#include <string_view>
-
-#include <fmt/format.h>
-
-#include "shader_recompiler/backend/glsl/reg_alloc.h"
-#include "shader_recompiler/exception.h"
-#include "shader_recompiler/frontend/ir/value.h"
-
-namespace Shader::Backend::GLSL {
-namespace {
-std::string Representation(Id id) {
-    if (id.is_condition_code != 0) {
-        throw NotImplementedException("Condition code");
-    }
-    if (id.is_spill != 0) {
-        throw NotImplementedException("Spilling");
-    }
-    const u32 index{static_cast<u32>(id.index)};
-    return fmt::format("R{}", index);
-}
-
-std::string FormatFloat(std::string_view value, IR::Type type) {
-    // TODO: Confirm FP64 nan/inf
-    if (type == IR::Type::F32) {
-        if (value == "nan") {
-            return "uintBitsToFloat(0x7fc00000)";
-        }
-        if (value == "inf") {
-            return "uintBitsToFloat(0x7f800000)";
-        }
-        if (value == "-inf") {
-            return "uintBitsToFloat(0xff800000)";
-        }
-    }
-    if (value.find_first_of('e') != std::string_view::npos) {
-        // scientific notation
-        const auto cast{type == IR::Type::F32 ? "float" : "double"};
-        return fmt::format("{}({})", cast, value);
-    }
-    const bool needs_dot{value.find_first_of('.') == std::string_view::npos};
-    const bool needs_suffix{!value.ends_with('f')};
-    const auto suffix{type == IR::Type::F32 ? "f" : "lf"};
-    return fmt::format("{}{}{}", value, needs_dot ? "." : "", needs_suffix ? suffix : "");
-}
-
-std::string MakeImm(const IR::Value& value) {
-    switch (value.Type()) {
-    case IR::Type::U1:
-        return fmt::format("{}", value.U1() ? "true" : "false");
-    case IR::Type::U32:
-        return fmt::format("{}u", value.U32());
-    case IR::Type::F32:
-        return FormatFloat(fmt::format("{}", value.F32()), IR::Type::F32);
-    case IR::Type::U64:
-        return fmt::format("{}ul", value.U64());
-    case IR::Type::F64:
-        return FormatFloat(fmt::format("{}", value.F64()), IR::Type::F64);
-    case IR::Type::Void:
-        return "";
-    default:
-        throw NotImplementedException("Immediate type {}", value.Type());
-    }
-}
-} // Anonymous namespace
-
-std::string RegAlloc::Define(IR::Inst& inst) {
-    const Id id{Alloc()};
-    inst.SetDefinition<Id>(id);
-    return Representation(id);
-}
-
-std::string RegAlloc::Define(IR::Inst& inst, Type type) {
-    const Id id{Alloc()};
-    std::string type_str = "";
-    if (!register_defined[id.index]) {
-        register_defined[id.index] = true;
-        // type_str = GetGlslType(type);
-        reg_types.push_back(GetGlslType(type));
-        ++num_used_registers;
-    }
-    inst.SetDefinition<Id>(id);
-    return type_str + Representation(id);
-}
-
-std::string RegAlloc::Define(IR::Inst& inst, IR::Type type) {
-    return Define(inst, RegType(type));
-}
-
-std::string RegAlloc::Consume(const IR::Value& value) {
-    return value.IsImmediate() ? MakeImm(value) : Consume(*value.InstRecursive());
-}
-
-std::string RegAlloc::Consume(IR::Inst& inst) {
-    inst.DestructiveRemoveUsage();
-    // TODO: reuse variables of same type if possible
-    // if (!inst.HasUses()) {
-    //     Free(id);
-    // }
-    return Representation(inst.Definition<Id>());
-}
-
-Type RegAlloc::RegType(IR::Type type) {
-    switch (type) {
-    case IR::Type::U1:
-        return Type::U1;
-    case IR::Type::U32:
-        return Type::U32;
-    case IR::Type::F32:
-        return Type::F32;
-    case IR::Type::U64:
-        return Type::U64;
-    case IR::Type::F64:
-        return Type::F64;
-    default:
-        throw NotImplementedException("IR type {}", type);
-    }
-}
-
-std::string RegAlloc::GetGlslType(Type type) {
-    switch (type) {
-    case Type::U1:
-        return "bool ";
-    case Type::F16x2:
-        return "f16vec2 ";
-    case Type::U32:
-        return "uint ";
-    case Type::S32:
-        return "int ";
-    case Type::F32:
-        return "float ";
-    case Type::S64:
-        return "int64_t ";
-    case Type::U64:
-        return "uint64_t ";
-    case Type::F64:
-        return "double ";
-    case Type::U32x2:
-        return "uvec2 ";
-    case Type::F32x2:
-        return "vec2 ";
-    case Type::U32x3:
-        return "uvec3 ";
-    case Type::F32x3:
-        return "vec3 ";
-    case Type::U32x4:
-        return "uvec4 ";
-    case Type::F32x4:
-        return "vec4 ";
-    case Type::Void:
-        return "";
-    default:
-        throw NotImplementedException("Type {}", type);
-    }
-}
-
-std::string RegAlloc::GetGlslType(IR::Type type) {
-    return GetGlslType(RegType(type));
-}
-
-Id RegAlloc::Alloc() {
-    if (num_used_registers < NUM_REGS) {
-        for (size_t reg = 0; reg < NUM_REGS; ++reg) {
-            if (register_use[reg]) {
-                continue;
-            }
-            register_use[reg] = true;
-            Id ret{};
-            ret.is_valid.Assign(1);
-            ret.is_long.Assign(0);
-            ret.is_spill.Assign(0);
-            ret.is_condition_code.Assign(0);
-            ret.index.Assign(static_cast<u32>(reg));
-            return ret;
-        }
-    }
-    throw NotImplementedException("Register spilling");
-}
-
-void RegAlloc::Free(Id id) {
-    if (id.is_spill != 0) {
-        throw NotImplementedException("Free spill");
-    }
-    register_use[id.index] = false;
-}
-
-} // namespace Shader::Backend::GLSL