247 lines
7.9 KiB
C++
247 lines
7.9 KiB
C++
// Copyright 2021 yuzu Emulator Project
|
|
// Licensed under GPLv2 or any later version
|
|
// Refer to the license.txt file included.
|
|
|
|
#include <algorithm>
|
|
#include <tuple>
|
|
#include <type_traits>
|
|
|
|
#include "common/bit_cast.h"
|
|
#include "common/bit_util.h"
|
|
#include "shader_recompiler/exception.h"
|
|
#include "shader_recompiler/frontend/ir/microinstruction.h"
|
|
#include "shader_recompiler/ir_opt/passes.h"
|
|
|
|
namespace Shader::Optimization {
|
|
namespace {
|
|
// Metaprogramming stuff to get arguments information out of a lambda
|
|
template <typename Func>
|
|
struct LambdaTraits : LambdaTraits<decltype(&std::remove_reference_t<Func>::operator())> {};
|
|
|
|
template <typename ReturnType, typename LambdaType, typename... Args>
|
|
struct LambdaTraits<ReturnType (LambdaType::*)(Args...) const> {
|
|
template <size_t I>
|
|
using ArgType = std::tuple_element_t<I, std::tuple<Args...>>;
|
|
|
|
static constexpr size_t NUM_ARGS{sizeof...(Args)};
|
|
};
|
|
|
|
template <typename T>
|
|
[[nodiscard]] T Arg(const IR::Value& value) {
|
|
if constexpr (std::is_same_v<T, bool>) {
|
|
return value.U1();
|
|
} else if constexpr (std::is_same_v<T, u32>) {
|
|
return value.U32();
|
|
} else if constexpr (std::is_same_v<T, s32>) {
|
|
return static_cast<s32>(value.U32());
|
|
} else if constexpr (std::is_same_v<T, f32>) {
|
|
return value.F32();
|
|
} else if constexpr (std::is_same_v<T, u64>) {
|
|
return value.U64();
|
|
}
|
|
}
|
|
|
|
template <typename T, typename ImmFn>
|
|
bool FoldCommutative(IR::Inst& inst, ImmFn&& imm_fn) {
|
|
const IR::Value lhs{inst.Arg(0)};
|
|
const IR::Value rhs{inst.Arg(1)};
|
|
|
|
const bool is_lhs_immediate{lhs.IsImmediate()};
|
|
const bool is_rhs_immediate{rhs.IsImmediate()};
|
|
|
|
if (is_lhs_immediate && is_rhs_immediate) {
|
|
const auto result{imm_fn(Arg<T>(lhs), Arg<T>(rhs))};
|
|
inst.ReplaceUsesWith(IR::Value{result});
|
|
return false;
|
|
}
|
|
if (is_lhs_immediate && !is_rhs_immediate) {
|
|
IR::Inst* const rhs_inst{rhs.InstRecursive()};
|
|
if (rhs_inst->Opcode() == inst.Opcode() && rhs_inst->Arg(1).IsImmediate()) {
|
|
const auto combined{imm_fn(Arg<T>(lhs), Arg<T>(rhs_inst->Arg(1)))};
|
|
inst.SetArg(0, rhs_inst->Arg(0));
|
|
inst.SetArg(1, IR::Value{combined});
|
|
} else {
|
|
// Normalize
|
|
inst.SetArg(0, rhs);
|
|
inst.SetArg(1, lhs);
|
|
}
|
|
}
|
|
if (!is_lhs_immediate && is_rhs_immediate) {
|
|
const IR::Inst* const lhs_inst{lhs.InstRecursive()};
|
|
if (lhs_inst->Opcode() == inst.Opcode() && lhs_inst->Arg(1).IsImmediate()) {
|
|
const auto combined{imm_fn(Arg<T>(rhs), Arg<T>(lhs_inst->Arg(1)))};
|
|
inst.SetArg(0, lhs_inst->Arg(0));
|
|
inst.SetArg(1, IR::Value{combined});
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void FoldGetRegister(IR::Inst& inst) {
|
|
if (inst.Arg(0).Reg() == IR::Reg::RZ) {
|
|
inst.ReplaceUsesWith(IR::Value{u32{0}});
|
|
}
|
|
}
|
|
|
|
void FoldGetPred(IR::Inst& inst) {
|
|
if (inst.Arg(0).Pred() == IR::Pred::PT) {
|
|
inst.ReplaceUsesWith(IR::Value{true});
|
|
}
|
|
}
|
|
|
|
template <typename T>
|
|
void FoldAdd(IR::Inst& inst) {
|
|
if (inst.HasAssociatedPseudoOperation()) {
|
|
return;
|
|
}
|
|
if (!FoldCommutative<T>(inst, [](T a, T b) { return a + b; })) {
|
|
return;
|
|
}
|
|
const IR::Value rhs{inst.Arg(1)};
|
|
if (rhs.IsImmediate() && Arg<T>(rhs) == 0) {
|
|
inst.ReplaceUsesWith(inst.Arg(0));
|
|
}
|
|
}
|
|
|
|
template <typename T>
|
|
void FoldSelect(IR::Inst& inst) {
|
|
const IR::Value cond{inst.Arg(0)};
|
|
if (cond.IsImmediate()) {
|
|
inst.ReplaceUsesWith(cond.U1() ? inst.Arg(1) : inst.Arg(2));
|
|
}
|
|
}
|
|
|
|
void FoldLogicalAnd(IR::Inst& inst) {
|
|
if (!FoldCommutative<bool>(inst, [](bool a, bool b) { return a && b; })) {
|
|
return;
|
|
}
|
|
const IR::Value rhs{inst.Arg(1)};
|
|
if (rhs.IsImmediate()) {
|
|
if (rhs.U1()) {
|
|
inst.ReplaceUsesWith(inst.Arg(0));
|
|
} else {
|
|
inst.ReplaceUsesWith(IR::Value{false});
|
|
}
|
|
}
|
|
}
|
|
|
|
void FoldLogicalOr(IR::Inst& inst) {
|
|
if (!FoldCommutative<bool>(inst, [](bool a, bool b) { return a || b; })) {
|
|
return;
|
|
}
|
|
const IR::Value rhs{inst.Arg(1)};
|
|
if (rhs.IsImmediate()) {
|
|
if (rhs.U1()) {
|
|
inst.ReplaceUsesWith(IR::Value{true});
|
|
} else {
|
|
inst.ReplaceUsesWith(inst.Arg(0));
|
|
}
|
|
}
|
|
}
|
|
|
|
void FoldLogicalNot(IR::Inst& inst) {
|
|
const IR::U1 value{inst.Arg(0)};
|
|
if (value.IsImmediate()) {
|
|
inst.ReplaceUsesWith(IR::Value{!value.U1()});
|
|
return;
|
|
}
|
|
IR::Inst* const arg{value.InstRecursive()};
|
|
if (arg->Opcode() == IR::Opcode::LogicalNot) {
|
|
inst.ReplaceUsesWith(arg->Arg(0));
|
|
}
|
|
}
|
|
|
|
template <typename Dest, typename Source>
|
|
void FoldBitCast(IR::Inst& inst, IR::Opcode reverse) {
|
|
const IR::Value value{inst.Arg(0)};
|
|
if (value.IsImmediate()) {
|
|
inst.ReplaceUsesWith(IR::Value{Common::BitCast<Dest>(Arg<Source>(value))});
|
|
return;
|
|
}
|
|
IR::Inst* const arg_inst{value.InstRecursive()};
|
|
if (value.InstRecursive()->Opcode() == reverse) {
|
|
inst.ReplaceUsesWith(arg_inst->Arg(0));
|
|
}
|
|
}
|
|
|
|
template <typename Func, size_t... I>
|
|
IR::Value EvalImmediates(const IR::Inst& inst, Func&& func, std::index_sequence<I...>) {
|
|
using Traits = LambdaTraits<decltype(func)>;
|
|
return IR::Value{func(Arg<Traits::ArgType<I>>(inst.Arg(I))...)};
|
|
}
|
|
|
|
template <typename Func>
|
|
void FoldWhenAllImmediates(IR::Inst& inst, Func&& func) {
|
|
if (!inst.AreAllArgsImmediates() || inst.HasAssociatedPseudoOperation()) {
|
|
return;
|
|
}
|
|
using Indices = std::make_index_sequence<LambdaTraits<decltype(func)>::NUM_ARGS>;
|
|
inst.ReplaceUsesWith(EvalImmediates(inst, func, Indices{}));
|
|
}
|
|
|
|
void FoldBranchConditional(IR::Inst& inst) {
|
|
const IR::U1 cond{inst.Arg(0)};
|
|
if (cond.IsImmediate()) {
|
|
// TODO: Convert to Branch
|
|
return;
|
|
}
|
|
const IR::Inst* cond_inst{cond.InstRecursive()};
|
|
if (cond_inst->Opcode() == IR::Opcode::LogicalNot) {
|
|
const IR::Value true_label{inst.Arg(1)};
|
|
const IR::Value false_label{inst.Arg(2)};
|
|
// Remove negation on the conditional (take the parameter out of LogicalNot) and swap
|
|
// the branches
|
|
inst.SetArg(0, cond_inst->Arg(0));
|
|
inst.SetArg(1, false_label);
|
|
inst.SetArg(2, true_label);
|
|
}
|
|
}
|
|
|
|
void ConstantPropagation(IR::Inst& inst) {
|
|
switch (inst.Opcode()) {
|
|
case IR::Opcode::GetRegister:
|
|
return FoldGetRegister(inst);
|
|
case IR::Opcode::GetPred:
|
|
return FoldGetPred(inst);
|
|
case IR::Opcode::IAdd32:
|
|
return FoldAdd<u32>(inst);
|
|
case IR::Opcode::BitCastF32U32:
|
|
return FoldBitCast<f32, u32>(inst, IR::Opcode::BitCastU32F32);
|
|
case IR::Opcode::BitCastU32F32:
|
|
return FoldBitCast<u32, f32>(inst, IR::Opcode::BitCastF32U32);
|
|
case IR::Opcode::IAdd64:
|
|
return FoldAdd<u64>(inst);
|
|
case IR::Opcode::Select32:
|
|
return FoldSelect<u32>(inst);
|
|
case IR::Opcode::LogicalAnd:
|
|
return FoldLogicalAnd(inst);
|
|
case IR::Opcode::LogicalOr:
|
|
return FoldLogicalOr(inst);
|
|
case IR::Opcode::LogicalNot:
|
|
return FoldLogicalNot(inst);
|
|
case IR::Opcode::SLessThan:
|
|
return FoldWhenAllImmediates(inst, [](s32 a, s32 b) { return a < b; });
|
|
case IR::Opcode::ULessThan:
|
|
return FoldWhenAllImmediates(inst, [](u32 a, u32 b) { return a < b; });
|
|
case IR::Opcode::BitFieldUExtract:
|
|
return FoldWhenAllImmediates(inst, [](u32 base, u32 shift, u32 count) {
|
|
if (static_cast<size_t>(shift) + static_cast<size_t>(count) > Common::BitSize<u32>()) {
|
|
throw LogicError("Undefined result in {}({}, {}, {})", IR::Opcode::BitFieldUExtract,
|
|
base, shift, count);
|
|
}
|
|
return (base >> shift) & ((1U << count) - 1);
|
|
});
|
|
case IR::Opcode::BranchConditional:
|
|
return FoldBranchConditional(inst);
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
} // Anonymous namespace
|
|
|
|
void ConstantPropagationPass(IR::Block& block) {
|
|
std::ranges::for_each(block, ConstantPropagation);
|
|
}
|
|
|
|
} // namespace Shader::Optimization
|