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// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/bit_field.h"
#include "common/common_types.h"
#include "shader_recompiler/frontend/maxwell/translate/impl/impl.h"
namespace Shader::Maxwell {
namespace {
enum class IntegerWidth : u64 {
Byte,
Short,
Word,
};
[[nodiscard]] IR::U32 WidthSize(IR::IREmitter& ir, IntegerWidth width) {
switch (width) {
case IntegerWidth::Byte:
return ir.Imm32(8);
case IntegerWidth::Short:
return ir.Imm32(16);
case IntegerWidth::Word:
return ir.Imm32(32);
default:
throw NotImplementedException("Invalid width {}", width);
}
}
[[nodiscard]] IR::U32 ConvertInteger(IR::IREmitter& ir, const IR::U32& src,
IntegerWidth dst_width) {
const IR::U32 zero{ir.Imm32(0)};
const IR::U32 count{WidthSize(ir, dst_width)};
return ir.BitFieldExtract(src, zero, count, false);
}
[[nodiscard]] IR::U32 SaturateInteger(IR::IREmitter& ir, const IR::U32& src, IntegerWidth dst_width,
bool dst_signed, bool src_signed) {
IR::U32 min{};
IR::U32 max{};
const IR::U32 zero{ir.Imm32(0)};
switch (dst_width) {
case IntegerWidth::Byte:
min = dst_signed && src_signed ? ir.Imm32(0xffffff80) : zero;
max = dst_signed ? ir.Imm32(0x7f) : ir.Imm32(0xff);
break;
case IntegerWidth::Short:
min = dst_signed && src_signed ? ir.Imm32(0xffff8000) : zero;
max = dst_signed ? ir.Imm32(0x7fff) : ir.Imm32(0xffff);
break;
case IntegerWidth::Word:
min = dst_signed && src_signed ? ir.Imm32(0x80000000) : zero;
max = dst_signed ? ir.Imm32(0x7fffffff) : ir.Imm32(0xffffffff);
break;
default:
throw NotImplementedException("Invalid width {}", dst_width);
}
const IR::U32 value{!dst_signed && src_signed ? ir.SMax(zero, src) : src};
return dst_signed && src_signed ? ir.SClamp(value, min, max) : ir.UClamp(value, min, max);
}
void I2I(TranslatorVisitor& v, u64 insn, const IR::U32& src_a) {
union {
u64 insn;
BitField<0, 8, IR::Reg> dest_reg;
BitField<8, 2, IntegerWidth> dst_fmt;
BitField<12, 1, u64> dst_fmt_sign;
BitField<10, 2, IntegerWidth> src_fmt;
BitField<13, 1, u64> src_fmt_sign;
BitField<41, 3, u64> selector;
BitField<45, 1, u64> neg;
BitField<47, 1, u64> cc;
BitField<49, 1, u64> abs;
BitField<50, 1, u64> sat;
} const i2i{insn};
if (i2i.src_fmt == IntegerWidth::Short && (i2i.selector == 1 || i2i.selector == 3)) {
throw NotImplementedException("16-bit source format incompatible with selector {}",
i2i.selector);
}
if (i2i.src_fmt == IntegerWidth::Word && i2i.selector != 0) {
throw NotImplementedException("32-bit source format incompatible with selector {}",
i2i.selector);
}
const s32 selector{static_cast<s32>(i2i.selector)};
const IR::U32 offset{v.ir.Imm32(selector * 8)};
const IR::U32 count{WidthSize(v.ir, i2i.src_fmt)};
const bool src_signed{i2i.src_fmt_sign != 0};
const bool dst_signed{i2i.dst_fmt_sign != 0};
const bool sat{i2i.sat != 0};
IR::U32 src_values{v.ir.BitFieldExtract(src_a, offset, count, src_signed)};
if (i2i.abs != 0) {
src_values = v.ir.IAbs(src_values);
}
if (i2i.neg != 0) {
src_values = v.ir.INeg(src_values);
}
const IR::U32 result{
sat ? SaturateInteger(v.ir, src_values, i2i.dst_fmt, dst_signed, src_signed)
: ConvertInteger(v.ir, src_values, i2i.dst_fmt)};
v.X(i2i.dest_reg, result);
if (i2i.cc != 0) {
v.SetZFlag(v.ir.GetZeroFromOp(result));
v.SetSFlag(v.ir.GetSignFromOp(result));
v.ResetCFlag();
v.ResetOFlag();
}
}
} // Anonymous namespace
void TranslatorVisitor::I2I_reg(u64 insn) {
I2I(*this, insn, GetReg20(insn));
}
void TranslatorVisitor::I2I_cbuf(u64 insn) {
I2I(*this, insn, GetCbuf(insn));
}
void TranslatorVisitor::I2I_imm(u64 insn) {
I2I(*this, insn, GetImm20(insn));
}
} // namespace Shader::Maxwell
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