void BX_CPP_AttrRegparmN(1) BX_CPU_C::CMPXCHG_EwGwM(bxInstruction_c *i)
{
#if BX_CPU_LEVEL >= 4
Bit16u op1_16, op2_16, diff_16;
BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
op1_16 = read_RMW_virtual_word(i->seg(), RMAddr(i));
diff_16 = AX - op1_16;
SET_FLAGS_OSZAPC_SUB_16(AX, op1_16, diff_16);
if (diff_16 == 0) { // if accumulator == dest
// dest <-- src
op2_16 = BX_READ_16BIT_REG(i->nnn());
write_RMW_virtual_word(op2_16);
}
else {
// accumulator <-- dest
AX = op1_16;
}
#else
BX_INFO(("CMPXCHG_EwGw: not supported for cpu-level <= 3"));
UndefinedOpcode(i);
#endif
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::XADD_EwGwM(bxInstruction_c *i)
{
#if BX_CPU_LEVEL >= 4
Bit16u op1_16, op2_16, sum_16;
/* XADD dst(r/m), src(r)
* temp <-- src + dst | sum = op2 + op1
* src <-- dst | op2 = op1
* dst <-- tmp | op1 = sum
*/
BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
op1_16 = read_RMW_virtual_word(i->seg(), RMAddr(i));
op2_16 = BX_READ_16BIT_REG(i->nnn());
sum_16 = op1_16 + op2_16;
write_RMW_virtual_word(sum_16);
/* and write destination into source */
BX_WRITE_16BIT_REG(i->nnn(), op1_16);
SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
#else
BX_INFO(("XADD_EwGw: not supported on < 80486"));
UndefinedOpcode(i);
#endif
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::XCHG_EwGwM(bxInstruction_c *i)
{
Bit16u op1_16, op2_16;
BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
op1_16 = read_RMW_virtual_word(i->seg(), RMAddr(i));
op2_16 = BX_READ_16BIT_REG(i->nnn());
write_RMW_virtual_word(op2_16);
BX_WRITE_16BIT_REG(i->nnn(), op1_16);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::DEC_EwM(bxInstruction_c *i)
{
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
Bit32u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
op1_16--;
write_RMW_virtual_word(op1_16);
SET_FLAGS_OSZAP_SUB_16(op1_16 + 1, 0, op1_16);
BX_NEXT_INSTR(i);
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::DEC_EwM(bxInstruction_c *i)
{
Bit16u op1_16;
BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
op1_16 = read_RMW_virtual_word(i->seg(), RMAddr(i));
op1_16--;
write_RMW_virtual_word(op1_16);
SET_FLAGS_OSZAPC_DEC_16(op1_16);
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::NEG_EwM(bxInstruction_c *i)
{
Bit16u op1_16;
BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
op1_16 = read_RMW_virtual_word(i->seg(), RMAddr(i));
op1_16 = - (Bit16s)(op1_16);
write_RMW_virtual_word(op1_16);
SET_FLAGS_OSZAPC_RESULT_16(op1_16, BX_LF_INSTR_NEG16);
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::SUB_EwIwM(bxInstruction_c *i)
{
Bit16u op1_16, op2_16 = i->Iw(), diff_16;
BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
op1_16 = read_RMW_virtual_word(i->seg(), RMAddr(i));
diff_16 = op1_16 - op2_16;
write_RMW_virtual_word(diff_16);
SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::ADC_EwIwM(bxInstruction_c *i)
{
bx_bool temp_CF = getB_CF();
Bit16u op1_16, op2_16 = i->Iw(), sum_16;
BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
op1_16 = read_RMW_virtual_word(i->seg(), RMAddr(i));
sum_16 = op1_16 + op2_16 + temp_CF;
write_RMW_virtual_word(sum_16);
SET_FLAGS_OSZAPC_16(op1_16, op2_16, sum_16, BX_LF_INSTR_ADD_ADC16(temp_CF));
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::ADD_EwGwM(bxInstruction_c *i)
{
Bit16u op1_16, op2_16, sum_16;
BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
op1_16 = read_RMW_virtual_word(i->seg(), RMAddr(i));
op2_16 = BX_READ_16BIT_REG(i->nnn());
sum_16 = op1_16 + op2_16;
write_RMW_virtual_word(sum_16);
SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADC_EwGwM(bxInstruction_c *i)
{
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
Bit32u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
Bit32u op2_16 = BX_READ_16BIT_REG(i->nnn());
Bit32u sum_16 = op1_16 + op2_16 + getB_CF();
write_RMW_virtual_word(sum_16);
SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SUB_EwIwM(bxInstruction_c *i)
{
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
Bit32u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
Bit32u op2_16 = i->Iw();
Bit32u diff_16 = op1_16 - op2_16;
write_RMW_virtual_word(diff_16);
SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
BX_NEXT_INSTR(i);
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::SBB_EwGwM(bxInstruction_c *i)
{
Bit16u op1_16, op2_16, diff_16;
bx_bool temp_CF = getB_CF();
BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
op1_16 = read_RMW_virtual_word(i->seg(), RMAddr(i));
op2_16 = BX_READ_16BIT_REG(i->nnn());
diff_16 = op1_16 - (op2_16 + temp_CF);
write_RMW_virtual_word(diff_16);
SET_FLAGS_OSZAPC_16(op1_16, op2_16, diff_16, BX_LF_INSTR_SUB_SBB16(temp_CF));
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CMPXCHG_EwGwM(bxInstruction_c *i)
{
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
Bit16u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
Bit16u diff_16 = AX - op1_16;
SET_FLAGS_OSZAPC_SUB_16(AX, op1_16, diff_16);
if (diff_16 == 0) { // if accumulator == dest
// dest <-- src
write_RMW_virtual_word(BX_READ_16BIT_REG(i->nnn()));
}
else {
// accumulator <-- dest
AX = op1_16;
}
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::XADD_EwGwM(bxInstruction_c *i)
{
/* 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));
Bit32u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
Bit32u op2_16 = BX_READ_16BIT_REG(i->nnn());
Bit32u sum_16 = op1_16 + op2_16;
write_RMW_virtual_word(sum_16);
/* and write destination into source */
BX_WRITE_16BIT_REG(i->nnn(), op1_16);
SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
BX_NEXT_INSTR(i);
}