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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"
namespace Shader::Maxwell {
namespace {
void ISCADD(TranslatorVisitor& v, u64 insn, IR::U32 op_b, bool cc, bool neg_a, bool neg_b,
u64 scale_imm) {
union {
u64 raw;
BitField<0, 8, IR::Reg> dest_reg;
BitField<8, 8, IR::Reg> op_a;
} const iscadd{insn};
const bool po{neg_a && neg_b};
IR::U32 op_a{v.X(iscadd.op_a)};
if (po) {
// When PO is present, add one
op_b = v.ir.IAdd(op_b, v.ir.Imm32(1));
} else {
// When PO is not present, the bits are interpreted as negation
if (neg_a) {
op_a = v.ir.INeg(op_a);
}
if (neg_b) {
op_b = v.ir.INeg(op_b);
}
}
// With the operands already processed, scale A
const IR::U32 scale{v.ir.Imm32(static_cast<u32>(scale_imm))};
const IR::U32 scaled_a{v.ir.ShiftLeftLogical(op_a, scale)};
const IR::U32 result{v.ir.IAdd(scaled_a, op_b)};
v.X(iscadd.dest_reg, result);
if (cc) {
v.SetZFlag(v.ir.GetZeroFromOp(result));
v.SetSFlag(v.ir.GetSignFromOp(result));
const IR::U1 carry{v.ir.GetCarryFromOp(result)};
const IR::U1 overflow{v.ir.GetOverflowFromOp(result)};
v.SetCFlag(po ? v.ir.LogicalOr(carry, v.ir.GetCarryFromOp(op_b)) : carry);
v.SetOFlag(po ? v.ir.LogicalOr(overflow, v.ir.GetOverflowFromOp(op_b)) : overflow);
}
}
void ISCADD(TranslatorVisitor& v, u64 insn, IR::U32 op_b) {
union {
u64 raw;
BitField<47, 1, u64> cc;
BitField<48, 1, u64> neg_b;
BitField<49, 1, u64> neg_a;
BitField<39, 5, u64> scale;
} const iscadd{insn};
ISCADD(v, insn, op_b, iscadd.cc != 0, iscadd.neg_a != 0, iscadd.neg_b != 0, iscadd.scale);
}
} // Anonymous namespace
void TranslatorVisitor::ISCADD_reg(u64 insn) {
ISCADD(*this, insn, GetReg20(insn));
}
void TranslatorVisitor::ISCADD_cbuf(u64 insn) {
ISCADD(*this, insn, GetCbuf(insn));
}
void TranslatorVisitor::ISCADD_imm(u64 insn) {
ISCADD(*this, insn, GetImm20(insn));
}
void TranslatorVisitor::ISCADD32I(u64 insn) {
union {
u64 raw;
BitField<52, 1, u64> cc;
BitField<53, 5, u64> scale;
} const iscadd{insn};
return ISCADD(*this, insn, GetImm32(insn), iscadd.cc != 0, false, false, iscadd.scale);
}
} // namespace Shader::Maxwell
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