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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 SelectMode : u64 {
Default,
CLO,
CHI,
CSFU,
CBCC,
};
enum class Half : u64 {
H0, // Least-significant bits (15:0)
H1, // Most-significant bits (31:16)
};
IR::U32 ExtractHalf(TranslatorVisitor& v, const IR::U32& src, Half half, bool is_signed) {
const IR::U32 offset{v.ir.Imm32(half == Half::H1 ? 16 : 0)};
return v.ir.BitFieldExtract(src, offset, v.ir.Imm32(16), is_signed);
}
void XMAD(TranslatorVisitor& v, u64 insn, const IR::U32& src_b, const IR::U32& src_c,
SelectMode select_mode, Half half_b, bool psl, bool mrg, bool x) {
union {
u64 raw;
BitField<0, 8, IR::Reg> dest_reg;
BitField<8, 8, IR::Reg> src_reg_a;
BitField<47, 1, u64> cc;
BitField<48, 1, u64> is_a_signed;
BitField<49, 1, u64> is_b_signed;
BitField<53, 1, Half> half_a;
} const xmad{insn};
if (x) {
throw NotImplementedException("XMAD X");
}
const IR::U32 op_a{ExtractHalf(v, v.X(xmad.src_reg_a), xmad.half_a, xmad.is_a_signed != 0)};
const IR::U32 op_b{ExtractHalf(v, src_b, half_b, xmad.is_b_signed != 0)};
IR::U32 product{v.ir.IMul(op_a, op_b)};
if (psl) {
// .PSL shifts the product 16 bits
product = v.ir.ShiftLeftLogical(product, v.ir.Imm32(16));
}
const IR::U32 op_c{[&]() -> IR::U32 {
switch (select_mode) {
case SelectMode::Default:
return src_c;
case SelectMode::CLO:
return ExtractHalf(v, src_c, Half::H0, false);
case SelectMode::CHI:
return ExtractHalf(v, src_c, Half::H1, false);
case SelectMode::CBCC:
return v.ir.IAdd(v.ir.ShiftLeftLogical(src_b, v.ir.Imm32(16)), src_c);
case SelectMode::CSFU:
throw NotImplementedException("XMAD CSFU");
}
throw NotImplementedException("Invalid XMAD select mode {}", select_mode);
}()};
IR::U32 result{v.ir.IAdd(product, op_c)};
if (mrg) {
// .MRG inserts src_b [15:0] into result's [31:16].
const IR::U32 lsb_b{ExtractHalf(v, src_b, Half::H0, false)};
result = v.ir.BitFieldInsert(result, lsb_b, v.ir.Imm32(16), v.ir.Imm32(16));
}
if (xmad.cc) {
throw NotImplementedException("XMAD CC");
}
// Store result
v.X(xmad.dest_reg, result);
}
} // Anonymous namespace
void TranslatorVisitor::XMAD_reg(u64 insn) {
union {
u64 raw;
BitField<35, 1, Half> half_b;
BitField<36, 1, u64> psl;
BitField<37, 1, u64> mrg;
BitField<38, 1, u64> x;
BitField<50, 3, SelectMode> select_mode;
} const xmad{insn};
XMAD(*this, insn, GetReg20(insn), GetReg39(insn), xmad.select_mode, xmad.half_b, xmad.psl != 0,
xmad.mrg != 0, xmad.x != 0);
}
void TranslatorVisitor::XMAD_rc(u64 insn) {
union {
u64 raw;
BitField<50, 2, SelectMode> select_mode;
BitField<52, 1, Half> half_b;
BitField<54, 1, u64> x;
} const xmad{insn};
XMAD(*this, insn, GetReg39(insn), GetCbuf(insn), xmad.select_mode, xmad.half_b, false, false,
xmad.x != 0);
}
void TranslatorVisitor::XMAD_cr(u64 insn) {
union {
u64 raw;
BitField<50, 2, SelectMode> select_mode;
BitField<52, 1, Half> half_b;
BitField<54, 1, u64> x;
BitField<55, 1, u64> psl;
BitField<56, 1, u64> mrg;
} const xmad{insn};
XMAD(*this, insn, GetCbuf(insn), GetReg39(insn), xmad.select_mode, xmad.half_b, xmad.psl != 0,
xmad.mrg != 0, xmad.x != 0);
}
void TranslatorVisitor::XMAD_imm(u64 insn) {
union {
u64 raw;
BitField<20, 16, u64> src_b;
BitField<36, 1, u64> psl;
BitField<37, 1, u64> mrg;
BitField<38, 1, u64> x;
BitField<50, 3, SelectMode> select_mode;
} const xmad{insn};
XMAD(*this, insn, ir.Imm32(static_cast<u32>(xmad.src_b)), GetReg39(insn), xmad.select_mode,
Half::H0, xmad.psl != 0, xmad.mrg != 0, xmad.x != 0);
}
} // namespace Shader::Maxwell
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