Bochs/bochs/cpu/arith64.cc
2014-10-21 19:11:21 +00:00

623 lines
16 KiB
C++

/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001-2014 The Bochs Project
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA B 02110-1301 USA
/////////////////////////////////////////////////////////////////////////
#define NEED_CPU_REG_SHORTCUTS 1
#include "bochs.h"
#include "cpu.h"
#define LOG_THIS BX_CPU_THIS_PTR
#if BX_SUPPORT_X86_64
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADD_EqGqM(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, sum_64;
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
/* pointer, segment address pair */
op1_64 = read_RMW_virtual_qword_64(i->seg(), get_laddr64(i->seg(), eaddr));
op2_64 = BX_READ_64BIT_REG(i->src());
sum_64 = op1_64 + op2_64;
write_RMW_virtual_qword(sum_64);
SET_FLAGS_OSZAPC_ADD_64(op1_64, op2_64, sum_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADD_GqEqR(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, sum_64;
op1_64 = BX_READ_64BIT_REG(i->dst());
op2_64 = BX_READ_64BIT_REG(i->src());
sum_64 = op1_64 + op2_64;
BX_WRITE_64BIT_REG(i->dst(), sum_64);
SET_FLAGS_OSZAPC_ADD_64(op1_64, op2_64, sum_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADD_GqEqM(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, sum_64;
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
op1_64 = BX_READ_64BIT_REG(i->dst());
op2_64 = read_linear_qword(i->seg(), get_laddr64(i->seg(), eaddr));
sum_64 = op1_64 + op2_64;
BX_WRITE_64BIT_REG(i->dst(), sum_64);
SET_FLAGS_OSZAPC_ADD_64(op1_64, op2_64, sum_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADC_EqGqM(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, sum_64;
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
/* pointer, segment address pair */
op1_64 = read_RMW_virtual_qword_64(i->seg(), get_laddr64(i->seg(), eaddr));
op2_64 = BX_READ_64BIT_REG(i->src());
sum_64 = op1_64 + op2_64 + getB_CF();
write_RMW_virtual_qword(sum_64);
SET_FLAGS_OSZAPC_ADD_64(op1_64, op2_64, sum_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADC_GqEqR(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, sum_64;
op1_64 = BX_READ_64BIT_REG(i->dst());
op2_64 = BX_READ_64BIT_REG(i->src());
sum_64 = op1_64 + op2_64 + getB_CF();
BX_WRITE_64BIT_REG(i->dst(), sum_64);
SET_FLAGS_OSZAPC_ADD_64(op1_64, op2_64, sum_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADC_GqEqM(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, sum_64;
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
op1_64 = BX_READ_64BIT_REG(i->dst());
op2_64 = read_linear_qword(i->seg(), get_laddr64(i->seg(), eaddr));
sum_64 = op1_64 + op2_64 + getB_CF();
BX_WRITE_64BIT_REG(i->dst(), sum_64);
SET_FLAGS_OSZAPC_ADD_64(op1_64, op2_64, sum_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SBB_EqGqM(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, diff_64;
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
/* pointer, segment address pair */
op1_64 = read_RMW_virtual_qword_64(i->seg(), get_laddr64(i->seg(), eaddr));
op2_64 = BX_READ_64BIT_REG(i->src());
diff_64 = op1_64 - (op2_64 + getB_CF());
write_RMW_virtual_qword(diff_64);
SET_FLAGS_OSZAPC_SUB_64(op1_64, op2_64, diff_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SBB_GqEqR(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, diff_64;
op1_64 = BX_READ_64BIT_REG(i->dst());
op2_64 = BX_READ_64BIT_REG(i->src());
diff_64 = op1_64 - (op2_64 + getB_CF());
BX_WRITE_64BIT_REG(i->dst(), diff_64);
SET_FLAGS_OSZAPC_SUB_64(op1_64, op2_64, diff_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SBB_GqEqM(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, diff_64;
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
op1_64 = BX_READ_64BIT_REG(i->dst());
op2_64 = read_linear_qword(i->seg(), get_laddr64(i->seg(), eaddr));
diff_64 = op1_64 - (op2_64 + getB_CF());
BX_WRITE_64BIT_REG(i->dst(), diff_64);
SET_FLAGS_OSZAPC_SUB_64(op1_64, op2_64, diff_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SBB_EqIdM(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, diff_64;
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
/* pointer, segment address pair */
op1_64 = read_RMW_virtual_qword_64(i->seg(), get_laddr64(i->seg(), eaddr));
op2_64 = (Bit32s) i->Id();
diff_64 = op1_64 - (op2_64 + getB_CF());
write_RMW_virtual_qword(diff_64);
SET_FLAGS_OSZAPC_SUB_64(op1_64, op2_64, diff_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SBB_EqIdR(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, diff_64;
op1_64 = BX_READ_64BIT_REG(i->dst());
op2_64 = (Bit32s) i->Id();
diff_64 = op1_64 - (op2_64 + getB_CF());
BX_WRITE_64BIT_REG(i->dst(), diff_64);
SET_FLAGS_OSZAPC_SUB_64(op1_64, op2_64, diff_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SUB_EqGqM(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, diff_64;
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
/* pointer, segment address pair */
op1_64 = read_RMW_virtual_qword_64(i->seg(), get_laddr64(i->seg(), eaddr));
op2_64 = BX_READ_64BIT_REG(i->src());
diff_64 = op1_64 - op2_64;
write_RMW_virtual_qword(diff_64);
SET_FLAGS_OSZAPC_SUB_64(op1_64, op2_64, diff_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SUB_GqEqR(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, diff_64;
op1_64 = BX_READ_64BIT_REG(i->dst());
op2_64 = BX_READ_64BIT_REG(i->src());
diff_64 = op1_64 - op2_64;
BX_WRITE_64BIT_REG(i->dst(), diff_64);
SET_FLAGS_OSZAPC_SUB_64(op1_64, op2_64, diff_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SUB_GqEqM(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, diff_64;
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
op1_64 = BX_READ_64BIT_REG(i->dst());
op2_64 = read_linear_qword(i->seg(), get_laddr64(i->seg(), eaddr));
diff_64 = op1_64 - op2_64;
BX_WRITE_64BIT_REG(i->dst(), diff_64);
SET_FLAGS_OSZAPC_SUB_64(op1_64, op2_64, diff_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CMP_EqGqM(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, diff_64;
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
op1_64 = read_linear_qword(i->seg(), get_laddr64(i->seg(), eaddr));
op2_64 = BX_READ_64BIT_REG(i->src());
diff_64 = op1_64 - op2_64;
SET_FLAGS_OSZAPC_SUB_64(op1_64, op2_64, diff_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CMP_GqEqR(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, diff_64;
op1_64 = BX_READ_64BIT_REG(i->dst());
op2_64 = BX_READ_64BIT_REG(i->src());
diff_64 = op1_64 - op2_64;
SET_FLAGS_OSZAPC_SUB_64(op1_64, op2_64, diff_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CMP_GqEqM(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, diff_64;
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
op1_64 = BX_READ_64BIT_REG(i->dst());
op2_64 = read_linear_qword(i->seg(), get_laddr64(i->seg(), eaddr));
diff_64 = op1_64 - op2_64;
SET_FLAGS_OSZAPC_SUB_64(op1_64, op2_64, diff_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CDQE(bxInstruction_c *i)
{
/* CWDE: no flags are affected */
RAX = (Bit32s) EAX;
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CQO(bxInstruction_c *i)
{
/* CQO: no flags are affected */
if (RAX & BX_CONST64(0x8000000000000000))
RDX = BX_CONST64(0xffffffffffffffff);
else
RDX = 0;
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::XADD_EqGqM(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, sum_64;
/* XADD dst(r/m), src(r)
* temp <-- src + dst | sum = op2 + op1
* src <-- dst | op2 = op1
* dst <-- tmp | op1 = sum
*/
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
/* pointer, segment address pair */
op1_64 = read_RMW_virtual_qword_64(i->seg(), get_laddr64(i->seg(), eaddr));
op2_64 = BX_READ_64BIT_REG(i->src());
sum_64 = op1_64 + op2_64;
write_RMW_virtual_qword(sum_64);
/* and write destination into source */
BX_WRITE_64BIT_REG(i->src(), op1_64);
SET_FLAGS_OSZAPC_ADD_64(op1_64, op2_64, sum_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::XADD_EqGqR(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, sum_64;
/* XADD dst(r/m), src(r)
* temp <-- src + dst | sum = op2 + op1
* src <-- dst | op2 = op1
* dst <-- tmp | op1 = sum
*/
op1_64 = BX_READ_64BIT_REG(i->dst());
op2_64 = BX_READ_64BIT_REG(i->src());
sum_64 = op1_64 + op2_64;
// and write destination into source
// Note: if both op1 & op2 are registers, the last one written
// should be the sum, as op1 & op2 may be the same register.
// For example: XADD AL, AL
BX_WRITE_64BIT_REG(i->src(), op1_64);
BX_WRITE_64BIT_REG(i->dst(), sum_64);
SET_FLAGS_OSZAPC_ADD_64(op1_64, op2_64, sum_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADD_EqIdM(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, sum_64;
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
/* pointer, segment address pair */
op1_64 = read_RMW_virtual_qword_64(i->seg(), get_laddr64(i->seg(), eaddr));
op2_64 = (Bit32s) i->Id();
sum_64 = op1_64 + op2_64;
write_RMW_virtual_qword(sum_64);
SET_FLAGS_OSZAPC_ADD_64(op1_64, op2_64, sum_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADD_EqIdR(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, sum_64;
op1_64 = BX_READ_64BIT_REG(i->dst());
op2_64 = (Bit32s) i->Id();
sum_64 = op1_64 + op2_64;
BX_WRITE_64BIT_REG(i->dst(), sum_64);
SET_FLAGS_OSZAPC_ADD_64(op1_64, op2_64, sum_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADC_EqIdM(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, sum_64;
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
/* pointer, segment address pair */
op1_64 = read_RMW_virtual_qword_64(i->seg(), get_laddr64(i->seg(), eaddr));
op2_64 = (Bit32s) i->Id();
sum_64 = op1_64 + op2_64 + getB_CF();
write_RMW_virtual_qword(sum_64);
SET_FLAGS_OSZAPC_ADD_64(op1_64, op2_64, sum_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADC_EqIdR(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, sum_64;
op1_64 = BX_READ_64BIT_REG(i->dst());
op2_64 = (Bit32s) i->Id();
sum_64 = op1_64 + op2_64 + getB_CF();
BX_WRITE_64BIT_REG(i->dst(), sum_64);
SET_FLAGS_OSZAPC_ADD_64(op1_64, op2_64, sum_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SUB_EqIdM(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, diff_64;
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
/* pointer, segment address pair */
op1_64 = read_RMW_virtual_qword_64(i->seg(), get_laddr64(i->seg(), eaddr));
op2_64 = (Bit32s) i->Id();
diff_64 = op1_64 - op2_64;
write_RMW_virtual_qword(diff_64);
SET_FLAGS_OSZAPC_SUB_64(op1_64, op2_64, diff_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SUB_EqIdR(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, diff_64;
op1_64 = BX_READ_64BIT_REG(i->dst());
op2_64 = (Bit32s) i->Id();
diff_64 = op1_64 - op2_64;
BX_WRITE_64BIT_REG(i->dst(), diff_64);
SET_FLAGS_OSZAPC_SUB_64(op1_64, op2_64, diff_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CMP_EqIdM(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, diff_64;
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
op1_64 = read_linear_qword(i->seg(), get_laddr64(i->seg(), eaddr));
op2_64 = (Bit32s) i->Id();
diff_64 = op1_64 - op2_64;
SET_FLAGS_OSZAPC_SUB_64(op1_64, op2_64, diff_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CMP_EqIdR(bxInstruction_c *i)
{
Bit64u op1_64, op2_64, diff_64;
op1_64 = BX_READ_64BIT_REG(i->dst());
op2_64 = (Bit32s) i->Id();
diff_64 = op1_64 - op2_64;
SET_FLAGS_OSZAPC_SUB_64(op1_64, op2_64, diff_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::NEG_EqM(bxInstruction_c *i)
{
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
Bit64u op1_64 = read_RMW_virtual_qword_64(i->seg(), get_laddr64(i->seg(), eaddr));
op1_64 = - (Bit64s)(op1_64);
write_RMW_virtual_qword(op1_64);
SET_FLAGS_OSZAPC_SUB_64(0, -op1_64, op1_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::NEG_EqR(bxInstruction_c *i)
{
Bit64u op1_64 = BX_READ_64BIT_REG(i->dst());
op1_64 = - (Bit64s)(op1_64);
BX_WRITE_64BIT_REG(i->dst(), op1_64);
SET_FLAGS_OSZAPC_SUB_64(0, -op1_64, op1_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::INC_EqM(bxInstruction_c *i)
{
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
Bit64u op1_64 = read_RMW_virtual_qword_64(i->seg(), get_laddr64(i->seg(), eaddr));
op1_64++;
write_RMW_virtual_qword(op1_64);
SET_FLAGS_OSZAP_ADD_64(op1_64 - 1, 0, op1_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::INC_EqR(bxInstruction_c *i)
{
Bit64u rrx = ++BX_READ_64BIT_REG(i->dst());
SET_FLAGS_OSZAP_ADD_64(rrx - 1, 0, rrx);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::DEC_EqM(bxInstruction_c *i)
{
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
Bit64u op1_64 = read_RMW_virtual_qword_64(i->seg(), get_laddr64(i->seg(), eaddr));
op1_64--;
write_RMW_virtual_qword(op1_64);
SET_FLAGS_OSZAP_SUB_64(op1_64 + 1, 0, op1_64);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::DEC_EqR(bxInstruction_c *i)
{
Bit64u rrx = --BX_READ_64BIT_REG(i->dst());
SET_FLAGS_OSZAP_SUB_64(rrx + 1, 0, rrx);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CMPXCHG_EqGqM(bxInstruction_c *i)
{
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
Bit64u op1_64 = read_RMW_virtual_qword_64(i->seg(), get_laddr64(i->seg(), eaddr));
Bit64u diff_64 = RAX - op1_64;
SET_FLAGS_OSZAPC_SUB_64(RAX, op1_64, diff_64);
if (diff_64 == 0) { // if accumulator == dest
// dest <-- src
write_RMW_virtual_qword(BX_READ_64BIT_REG(i->src()));
}
else {
// accumulator <-- dest
write_RMW_virtual_qword(op1_64);
RAX = op1_64;
}
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CMPXCHG_EqGqR(bxInstruction_c *i)
{
Bit64u op1_64 = BX_READ_64BIT_REG(i->dst());
Bit64u diff_64 = RAX - op1_64;
SET_FLAGS_OSZAPC_SUB_64(RAX, op1_64, diff_64);
if (diff_64 == 0) { // if accumulator == dest
// dest <-- src
BX_WRITE_64BIT_REG(i->dst(), BX_READ_64BIT_REG(i->src()));
}
else {
// accumulator <-- dest
RAX = op1_64;
}
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CMPXCHG16B(bxInstruction_c *i)
{
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
Bit64u op1_64_lo, op1_64_hi, diff;
// check write permission for following write
read_RMW_linear_dqword_aligned_64(i->seg(), get_laddr64(i->seg(), eaddr), &op1_64_hi, &op1_64_lo);
diff = RAX - op1_64_lo;
diff |= RDX - op1_64_hi;
if (diff == 0) { // if accumulator == dest
write_RMW_linear_dqword(RCX, RBX);
assert_ZF();
}
else {
clear_ZF();
write_RMW_linear_dqword(op1_64_hi, op1_64_lo);
// accumulator <-- dest
RAX = op1_64_lo;
RDX = op1_64_hi;
}
BX_NEXT_INSTR(i);
}
#endif /* if BX_SUPPORT_X86_64 */