// 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/exception.h"
#include "shader_recompiler/frontend/maxwell/translate/impl/impl.h"
namespace Shader::Maxwell {
namespace {
enum class Operation : u64 {
Cos = 0,
Sin = 1,
Ex2 = 2, // Base 2 exponent
Lg2 = 3, // Base 2 logarithm
Rcp = 4, // Reciprocal
Rsq = 5, // Reciprocal square root
Rcp64H = 6, // 64-bit reciprocal
Rsq64H = 7, // 64-bit reciprocal square root
Sqrt = 8,
};
} // Anonymous namespace
void TranslatorVisitor::MUFU(u64 insn) {
// MUFU is used to implement a bunch of special functions. See Operation.
union {
u64 raw;
BitField<0, 8, IR::Reg> dest_reg;
BitField<8, 8, IR::Reg> src_reg;
BitField<20, 4, Operation> operation;
BitField<46, 1, u64> abs;
BitField<48, 1, u64> neg;
BitField<50, 1, u64> sat;
} const mufu{insn};
const IR::F32 op_a{ir.FPAbsNeg(F(mufu.src_reg), mufu.abs != 0, mufu.neg != 0)};
IR::F32 value{[&]() -> IR::F32 {
switch (mufu.operation) {
case Operation::Cos:
return ir.FPCos(op_a);
case Operation::Sin:
return ir.FPSin(op_a);
case Operation::Ex2:
return ir.FPExp2(op_a);
case Operation::Lg2:
return ir.FPLog2(op_a);
case Operation::Rcp:
return ir.FPRecip(op_a);
case Operation::Rsq:
return ir.FPRecipSqrt(op_a);
case Operation::Rcp64H:
throw NotImplementedException("MUFU.RCP64H");
case Operation::Rsq64H:
throw NotImplementedException("MUFU.RSQ64H");
case Operation::Sqrt:
return ir.FPSqrt(op_a);
default:
throw NotImplementedException("Invalid MUFU operation {}", mufu.operation.Value());
}
}()};
if (mufu.sat) {
value = ir.FPSaturate(value);
}
F(mufu.dest_reg, value);
}
} // namespace Shader::Maxwell
