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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 ComparisonOp : u64 {
False,
LessThan,
Equal,
LessThanEqual,
GreaterThan,
NotEqual,
GreaterThanEqual,
True,
};
[[nodiscard]] IR::U1 CompareToZero(TranslatorVisitor& v, const IR::U32& operand,
ComparisonOp compare_op, bool is_signed) {
const IR::U32 zero{v.ir.Imm32(0)};
switch (compare_op) {
case ComparisonOp::False:
return v.ir.Imm1(false);
case ComparisonOp::LessThan:
return v.ir.ILessThan(operand, zero, is_signed);
case ComparisonOp::Equal:
return v.ir.IEqual(operand, zero);
case ComparisonOp::LessThanEqual:
return v.ir.ILessThanEqual(operand, zero, is_signed);
case ComparisonOp::GreaterThan:
return v.ir.IGreaterThan(operand, zero, is_signed);
case ComparisonOp::NotEqual:
return v.ir.INotEqual(operand, zero);
case ComparisonOp::GreaterThanEqual:
return v.ir.IGreaterThanEqual(operand, zero, is_signed);
case ComparisonOp::True:
return v.ir.Imm1(true);
default:
throw NotImplementedException("ICMP.CMP");
}
}
void ICMP(TranslatorVisitor& v, u64 insn, const IR::U32& src_a, const IR::U32& operand) {
union {
u64 insn;
BitField<0, 8, IR::Reg> dest_reg;
BitField<8, 8, IR::Reg> src_reg;
BitField<48, 1, u64> is_signed;
BitField<49, 3, ComparisonOp> compare_op;
} const icmp{insn};
const IR::U32 zero{v.ir.Imm32(0)};
const bool is_signed{icmp.is_signed != 0};
const IR::U1 cmp_result{CompareToZero(v, operand, icmp.compare_op, is_signed)};
const IR::U32 src_reg{v.X(icmp.src_reg)};
const IR::U32 result{v.ir.Select(cmp_result, src_reg, src_a)};
v.X(icmp.dest_reg, result);
}
} // Anonymous namespace
void TranslatorVisitor::ICMP_reg(u64 insn) {
ICMP(*this, insn, GetReg20(insn), GetReg39(insn));
}
void TranslatorVisitor::ICMP_rc(u64 insn) {
ICMP(*this, insn, GetReg39(insn), GetCbuf(insn));
}
void TranslatorVisitor::ICMP_cr(u64 insn) {
ICMP(*this, insn, GetCbuf(insn), GetReg39(insn));
}
void TranslatorVisitor::ICMP_imm(u64 insn) {
ICMP(*this, insn, GetImm20(insn), GetReg39(insn));
}
} // namespace Shader::Maxwell
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