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// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "shader_recompiler/frontend/ir/basic_block.h"
#include "shader_recompiler/frontend/ir/ir_emitter.h"
#include "shader_recompiler/frontend/ir/value.h"
#include "shader_recompiler/ir_opt/passes.h"
namespace Shader::Optimization {
namespace {
void AddingByteSwapsWorkaround(IR::Block& block, IR::Inst& inst) {
/*
* Workaround for an NVIDIA bug seen in Super Mario RPG
*
* We are looking for this pattern:
* %lhs_bfe = BitFieldUExtract %factor_a, #0, #16
* %lhs_mul = IMul32 %lhs_bfe, %factor_b // potentially optional?
* %lhs_shl = ShiftLeftLogical32 %lhs_mul, #16
* %rhs_bfe = BitFieldUExtract %factor_a, #16, #16
* %result = IAdd32 %lhs_shl, %rhs_bfe
*
* And replacing the IAdd32 with a BitwiseOr32
* %result = BitwiseOr32 %lhs_shl, %rhs_bfe
*
*/
IR::Inst* const lhs_shl{inst.Arg(0).TryInstRecursive()};
IR::Inst* const rhs_bfe{inst.Arg(1).TryInstRecursive()};
if (!lhs_shl || !rhs_bfe) {
return;
}
if (lhs_shl->GetOpcode() != IR::Opcode::ShiftLeftLogical32 ||
lhs_shl->Arg(1) != IR::Value{16U}) {
return;
}
if (rhs_bfe->GetOpcode() != IR::Opcode::BitFieldUExtract || rhs_bfe->Arg(1) != IR::Value{16U} ||
rhs_bfe->Arg(2) != IR::Value{16U}) {
return;
}
IR::Inst* const lhs_mul{lhs_shl->Arg(0).TryInstRecursive()};
if (!lhs_mul) {
return;
}
const bool lhs_mul_optional{lhs_mul->GetOpcode() == IR::Opcode::BitFieldUExtract};
if (lhs_mul->GetOpcode() != IR::Opcode::IMul32 &&
lhs_mul->GetOpcode() != IR::Opcode::BitFieldUExtract) {
return;
}
IR::Inst* const lhs_bfe{lhs_mul_optional ? lhs_mul : lhs_mul->Arg(0).TryInstRecursive()};
if (!lhs_bfe) {
return;
}
if (lhs_bfe->GetOpcode() != IR::Opcode::BitFieldUExtract) {
return;
}
if (lhs_bfe->Arg(1) != IR::Value{0U} || lhs_bfe->Arg(2) != IR::Value{16U}) {
return;
}
IR::IREmitter ir{block, IR::Block::InstructionList::s_iterator_to(inst)};
inst.ReplaceUsesWith(ir.BitwiseOr(IR::U32{inst.Arg(0)}, IR::U32{inst.Arg(1)}));
}
} // Anonymous namespace
void VendorWorkaroundPass(IR::Program& program) {
for (IR::Block* const block : program.post_order_blocks) {
for (IR::Inst& inst : block->Instructions()) {
switch (inst.GetOpcode()) {
case IR::Opcode::IAdd32:
AddingByteSwapsWorkaround(*block, inst);
break;
default:
break;
}
}
}
}
} // namespace Shader::Optimization
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