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