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// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "common/bit_field.h"
#include "common/common_types.h"
#include "shader_recompiler/frontend/maxwell/translate/impl/impl.h"
#include "shader_recompiler/frontend/maxwell/translate/impl/load_constant.h"
namespace Shader::Maxwell {
using namespace LDC;
namespace {
std::pair<IR::U32, IR::U32> Slot(IR::IREmitter& ir, Mode mode, const IR::U32& imm_index,
const IR::U32& reg, const IR::U32& imm_offset) {
switch (mode) {
case Mode::Default:
return {imm_index, ir.IAdd(reg, imm_offset)};
case Mode::IS: {
// Segmented addressing mode
// Ra+imm_offset points into a flat mapping of const buffer
// address space
const IR::U32 address{ir.IAdd(reg, imm_offset)};
const IR::U32 index{ir.BitFieldExtract(address, ir.Imm32(16), ir.Imm32(16))};
const IR::U32 offset{ir.BitFieldExtract(address, ir.Imm32(0), ir.Imm32(16))};
return {ir.IAdd(index, imm_index), offset};
}
default:
break;
}
throw NotImplementedException("Mode {}", mode);
}
} // Anonymous namespace
void TranslatorVisitor::LDC(u64 insn) {
const Encoding ldc{insn};
const IR::U32 imm_index{ir.Imm32(static_cast<u32>(ldc.index))};
const IR::U32 reg{X(ldc.src_reg)};
const IR::U32 imm{ir.Imm32(static_cast<s32>(ldc.offset))};
const auto [index, offset]{Slot(ir, ldc.mode, imm_index, reg, imm)};
switch (ldc.size) {
case Size::U8:
X(ldc.dest_reg, IR::U32{ir.GetCbuf(index, offset, 8, false)});
break;
case Size::S8:
X(ldc.dest_reg, IR::U32{ir.GetCbuf(index, offset, 8, true)});
break;
case Size::U16:
X(ldc.dest_reg, IR::U32{ir.GetCbuf(index, offset, 16, false)});
break;
case Size::S16:
X(ldc.dest_reg, IR::U32{ir.GetCbuf(index, offset, 16, true)});
break;
case Size::B32:
X(ldc.dest_reg, IR::U32{ir.GetCbuf(index, offset, 32, false)});
break;
case Size::B64: {
if (!IR::IsAligned(ldc.dest_reg, 2)) {
throw NotImplementedException("Unaligned destination register");
}
const IR::Value vector{ir.GetCbuf(index, offset, 64, false)};
for (int i = 0; i < 2; ++i) {
X(ldc.dest_reg + i, IR::U32{ir.CompositeExtract(vector, static_cast<size_t>(i))});
}
break;
}
default:
throw NotImplementedException("Invalid size {}", ldc.size.Value());
}
}
} // namespace Shader::Maxwell
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