static void I486OP(cmpxchg_rm8_r8)(i386_state *cpustate) // Opcode 0x0f b0
{
UINT8 modrm = FETCH(cpustate);
if( modrm >= 0xc0 ) {
UINT8 dst = LOAD_RM8(modrm);
UINT8 src = LOAD_REG8(modrm);
if( REG8(AL) == dst ) {
STORE_RM8(modrm, src);
cpustate->ZF = 1;
CYCLES(cpustate,CYCLES_CMPXCHG_REG_REG_T);
} else {
REG8(AL) = dst;
cpustate->ZF = 0;
CYCLES(cpustate,CYCLES_CMPXCHG_REG_REG_F);
}
} else {
UINT32 ea = GetEA(cpustate,modrm);
UINT8 dst = READ8(cpustate,ea);
UINT8 src = LOAD_REG8(modrm);
if( REG8(AL) == dst ) {
WRITE8(cpustate,modrm, src);
cpustate->ZF = 1;
CYCLES(cpustate,CYCLES_CMPXCHG_REG_MEM_T);
} else {
REG8(AL) = dst;
cpustate->ZF = 0;
CYCLES(cpustate,CYCLES_CMPXCHG_REG_MEM_F);
}
}
}
void i386_device::i486_cmpxchg_rm8_r8() // Opcode 0x0f b0
{
UINT8 modrm = FETCH();
if( modrm >= 0xc0 ) {
UINT8 dst = LOAD_RM8(modrm);
UINT8 src = LOAD_REG8(modrm);
if( REG8(AL) == dst ) {
STORE_RM8(modrm, src);
m_ZF = 1;
CYCLES(CYCLES_CMPXCHG_REG_REG_T);
} else {
REG8(AL) = dst;
m_ZF = 0;
CYCLES(CYCLES_CMPXCHG_REG_REG_F);
}
} else {
// TODO: Check write if needed
UINT32 ea = GetEA(modrm,0);
UINT8 dst = READ8(ea);
UINT8 src = LOAD_REG8(modrm);
if( REG8(AL) == dst ) {
WRITE8(ea, src);
m_ZF = 1;
CYCLES(CYCLES_CMPXCHG_REG_MEM_T);
} else {
REG8(AL) = dst;
m_ZF = 0;
CYCLES(CYCLES_CMPXCHG_REG_MEM_F);
}
}
}
static void I486OP(xadd_rm8_r8)(i386_state *cpustate) // Opcode 0x0f c0
{
UINT8 modrm = FETCH(cpustate);
if( modrm >= 0xc0 ) {
UINT8 dst = LOAD_RM8(modrm);
UINT8 src = LOAD_REG8(modrm);
STORE_RM16(modrm, dst + src);
STORE_REG16(modrm, dst);
CYCLES(cpustate,CYCLES_XADD_REG_REG);
} else {
UINT32 ea = GetEA(cpustate,modrm);
UINT8 dst = READ8(cpustate,ea);
UINT8 src = LOAD_REG8(modrm);
WRITE8(cpustate,ea, dst + src);
STORE_REG8(modrm, dst);
CYCLES(cpustate,CYCLES_XADD_REG_MEM);
}
}
void i386_device::i486_xadd_rm8_r8() // Opcode 0x0f c0
{
UINT8 modrm = FETCH();
if( modrm >= 0xc0 ) {
UINT8 dst = LOAD_RM8(modrm);
UINT8 src = LOAD_REG8(modrm);
STORE_REG8(modrm, dst);
STORE_RM8(modrm, dst + src);
CYCLES(CYCLES_XADD_REG_REG);
} else {
UINT32 ea = GetEA(modrm,1);
UINT8 dst = READ8(ea);
UINT8 src = LOAD_REG8(modrm);
WRITE8(ea, dst + src);
STORE_REG8(modrm, dst);
CYCLES(CYCLES_XADD_REG_MEM);
}
}
