static int opCMPXCHG_b_a16(uint32_t fetchdat)
{
	uint8_t temp, temp2 = AL;
	if (!is486)
	{
		cpu_state.pc = cpu_state.oldpc;
		x86illegal();
		return 1;
	}
	fetch_ea_16(fetchdat);
	SEG_CHECK_WRITE(cpu_state.ea_seg);
	temp = geteab();                        if (cpu_state.abrt) return 1;
	if (AL == temp) seteab(getr8(cpu_reg));
	else            AL = temp;
	if (cpu_state.abrt) return 1;
	setsub8(temp2, temp);
	CLOCK_CYCLES((cpu_mod == 3) ? 6 : 10);
	return 0;
}
static int opCMPXCHG_b_a32(uint32_t fetchdat)
{
	uint8_t temp, temp2 = AL;
	if (!is486)
	{
		cpu_state.pc = cpu_state.oldpc;
		x86illegal();
		return 1;
	}
	fetch_ea_32(fetchdat);
	SEG_CHECK_WRITE(cpu_state.ea_seg);
	temp = geteab();                        if (cpu_state.abrt) return 1;
	if (AL == temp) seteab(getr8(cpu_reg));
	else            AL = temp;
	if (cpu_state.abrt) return 1;
	setsub8(temp2, temp);
	CLOCK_CYCLES((cpu_mod == 3) ? 6 : 10);
	return 0;
}

static int opCMPXCHG_w_a16(uint32_t fetchdat)
{
	uint16_t temp, temp2 = AX;
	if (!is486)
	{
		cpu_state.pc = cpu_state.oldpc;
		x86illegal();
		return 1;
	}
	fetch_ea_16(fetchdat);
	SEG_CHECK_WRITE(cpu_state.ea_seg);
	temp = geteaw();                        if (cpu_state.abrt) return 1;
	if (AX == temp) seteaw(cpu_state.regs[cpu_reg].w);
	else            AX = temp;
	if (cpu_state.abrt) return 1;
	setsub16(temp2, temp);
	CLOCK_CYCLES((cpu_mod == 3) ? 6 : 10);
	return 0;
}
static int opCMPXCHG_w_a32(uint32_t fetchdat)
{
	uint16_t temp, temp2 = AX;
	if (!is486)
	{
		cpu_state.pc = cpu_state.oldpc;
		x86illegal();
		return 1;
	}
	fetch_ea_32(fetchdat);
	SEG_CHECK_WRITE(cpu_state.ea_seg);
	temp = geteaw();                        if (cpu_state.abrt) return 1;
	if (AX == temp) seteaw(cpu_state.regs[cpu_reg].w);
	else            AX = temp;
	if (cpu_state.abrt) return 1;
	setsub16(temp2, temp);
	CLOCK_CYCLES((cpu_mod == 3) ? 6 : 10);
	return 0;
}

static int opCMPXCHG_l_a16(uint32_t fetchdat)
{
	uint32_t temp, temp2 = EAX;
	if (!is486)
	{
		cpu_state.pc = cpu_state.oldpc;
		x86illegal();
		return 1;
	}
	fetch_ea_16(fetchdat);
	SEG_CHECK_WRITE(cpu_state.ea_seg);
	temp = geteal();                        if (cpu_state.abrt) return 1;
	if (EAX == temp) seteal(cpu_state.regs[cpu_reg].l);
	else             EAX = temp;
	if (cpu_state.abrt) return 1;
	setsub32(temp2, temp);
	CLOCK_CYCLES((cpu_mod == 3) ? 6 : 10);
	return 0;
}
static int opCMPXCHG_l_a32(uint32_t fetchdat)
{
	uint32_t temp, temp2 = EAX;
	if (!is486)
	{
		cpu_state.pc = cpu_state.oldpc;
		x86illegal();
		return 1;
	}
	fetch_ea_32(fetchdat);
	SEG_CHECK_WRITE(cpu_state.ea_seg);
	temp = geteal();                        if (cpu_state.abrt) return 1;
	if (EAX == temp) seteal(cpu_state.regs[cpu_reg].l);
	else             EAX = temp;
	if (cpu_state.abrt) return 1;
	setsub32(temp2, temp);
	CLOCK_CYCLES((cpu_mod == 3) ? 6 : 10);
	return 0;
}

static int opCMPXCHG8B_a16(uint32_t fetchdat)
{
	uint32_t temp, temp_hi, temp2 = EAX, temp2_hi = EDX;
	if (!is486)
	{
		cpu_state.pc = cpu_state.oldpc;
		x86illegal();
		return 0;
	}
	fetch_ea_16(fetchdat);
	SEG_CHECK_WRITE(cpu_state.ea_seg);
	temp = geteal();
	temp_hi = readmeml(easeg, cpu_state.eaaddr + 4); if (cpu_state.abrt) return 0;
	if (EAX == temp && EDX == temp_hi)
	{
		seteal(EBX);
		writememl(easeg, cpu_state.eaaddr+4, ECX);
	}
	else
	{
		EAX = temp;
		EDX = temp_hi;
	}
	if (cpu_state.abrt) return 0;
	flags_rebuild();
	if (temp == temp2 && temp_hi == temp2_hi)
		cpu_state.flags |= Z_FLAG;
	else
		cpu_state.flags &= ~Z_FLAG;
	cycles -= (cpu_mod == 3) ? 6 : 10;
	return 0;
}
static int opCMPXCHG8B_a32(uint32_t fetchdat)
{
	uint32_t temp, temp_hi, temp2 = EAX, temp2_hi = EDX;
	if (!is486)
	{
		cpu_state.pc = cpu_state.oldpc;
		x86illegal();
		return 0;
	}
	fetch_ea_32(fetchdat);
	SEG_CHECK_WRITE(cpu_state.ea_seg);
	temp = geteal();
	temp_hi = readmeml(easeg, cpu_state.eaaddr + 4); if (cpu_state.abrt) return 0;
	if (EAX == temp && EDX == temp_hi)
	{
		seteal(EBX);
		writememl(easeg, cpu_state.eaaddr+4, ECX);
	}
	else
	{
		EAX = temp;
		EDX = temp_hi;
	}
	if (cpu_state.abrt) return 0;
	flags_rebuild();
	if (temp == temp2 && temp_hi == temp2_hi)
		cpu_state.flags |= Z_FLAG;
	else
		cpu_state.flags &= ~Z_FLAG;
	cycles -= (cpu_mod == 3) ? 6 : 10;
	return 0;
}

static int opXADD_b_a16(uint32_t fetchdat)
{
	uint8_t temp;
	if (!is486)
	{
		cpu_state.pc = cpu_state.oldpc;
		x86illegal();
		return 1;
	}
	fetch_ea_16(fetchdat);
	SEG_CHECK_WRITE(cpu_state.ea_seg);
	temp = geteab();                        if (cpu_state.abrt) return 1;
	seteab(temp + getr8(cpu_reg));              if (cpu_state.abrt) return 1;
	setadd8(temp, getr8(cpu_reg));
	setr8(cpu_reg, temp);
	CLOCK_CYCLES((cpu_mod == 3) ? 3 : 4);
	return 0;
}
static int opXADD_b_a32(uint32_t fetchdat)
{
	uint8_t temp;
	if (!is486)
	{
		cpu_state.pc = cpu_state.oldpc;
		x86illegal();
		return 1;
	}
	fetch_ea_32(fetchdat);
	SEG_CHECK_WRITE(cpu_state.ea_seg);
	temp = geteab();                        if (cpu_state.abrt) return 1;
	seteab(temp + getr8(cpu_reg));              if (cpu_state.abrt) return 1;
	setadd8(temp, getr8(cpu_reg));
	setr8(cpu_reg, temp);
	CLOCK_CYCLES((cpu_mod == 3) ? 3 : 4);
	return 0;
}

static int opXADD_w_a16(uint32_t fetchdat)
{
	uint16_t temp;
	if (!is486)
	{
		cpu_state.pc = cpu_state.oldpc;
		x86illegal();
		return 1;
	}
	fetch_ea_16(fetchdat);
	SEG_CHECK_WRITE(cpu_state.ea_seg);
	temp = geteaw();                        if (cpu_state.abrt) return 1;
	seteaw(temp + cpu_state.regs[cpu_reg].w);   if (cpu_state.abrt) return 1;
	setadd16(temp, cpu_state.regs[cpu_reg].w);
	cpu_state.regs[cpu_reg].w = temp;
	CLOCK_CYCLES((cpu_mod == 3) ? 3 : 4);
	return 0;
}
static int opXADD_w_a32(uint32_t fetchdat)
{
	uint16_t temp;
	if (!is486)
	{
		cpu_state.pc = cpu_state.oldpc;
		x86illegal();
		return 1;
	}
	fetch_ea_32(fetchdat);
	SEG_CHECK_WRITE(cpu_state.ea_seg);
	temp = geteaw();                        if (cpu_state.abrt) return 1;
	seteaw(temp + cpu_state.regs[cpu_reg].w);   if (cpu_state.abrt) return 1;
	setadd16(temp, cpu_state.regs[cpu_reg].w);
	cpu_state.regs[cpu_reg].w = temp;
	CLOCK_CYCLES((cpu_mod == 3) ? 3 : 4);
	return 0;
}

static int opXADD_l_a16(uint32_t fetchdat)
{
	uint32_t temp;
	if (!is486)
	{
		cpu_state.pc = cpu_state.oldpc;
		x86illegal();
		return 1;
	}
	fetch_ea_16(fetchdat);
	SEG_CHECK_WRITE(cpu_state.ea_seg);
	temp = geteal();                        if (cpu_state.abrt) return 1;
	seteal(temp + cpu_state.regs[cpu_reg].l);   if (cpu_state.abrt) return 1;
	setadd32(temp, cpu_state.regs[cpu_reg].l);
	cpu_state.regs[cpu_reg].l = temp;
	CLOCK_CYCLES((cpu_mod == 3) ? 3 : 4);
	return 0;
}
static int opXADD_l_a32(uint32_t fetchdat)
{
	uint32_t temp;
	if (!is486)
	{
		cpu_state.pc = cpu_state.oldpc;
		x86illegal();
		return 1;
	}
	fetch_ea_32(fetchdat);
	SEG_CHECK_WRITE(cpu_state.ea_seg);
	temp = geteal();                        if (cpu_state.abrt) return 1;
	seteal(temp + cpu_state.regs[cpu_reg].l);   if (cpu_state.abrt) return 1;
	setadd32(temp, cpu_state.regs[cpu_reg].l);
	cpu_state.regs[cpu_reg].l = temp;
	CLOCK_CYCLES((cpu_mod == 3) ? 3 : 4);
	return 0;
}
