static void I486OP(cmpxchg_rm16_r16)(i386_state *cpustate) // Opcode 0x0f b1 { UINT8 modrm = FETCH(cpustate); if( modrm >= 0xc0 ) { UINT16 dst = LOAD_RM16(modrm); UINT16 src = LOAD_REG16(modrm); if( REG16(AX) == dst ) { STORE_RM16(modrm, src); cpustate->ZF = 1; CYCLES(cpustate,CYCLES_CMPXCHG_REG_REG_T); } else { REG16(AX) = dst; cpustate->ZF = 0; CYCLES(cpustate,CYCLES_CMPXCHG_REG_REG_F); } } else { UINT32 ea = GetEA(cpustate,modrm); UINT16 dst = READ16(cpustate,ea); UINT16 src = LOAD_REG16(modrm); if( REG16(AX) == dst ) { WRITE16(cpustate,modrm, src); cpustate->ZF = 1; CYCLES(cpustate,CYCLES_CMPXCHG_REG_MEM_T); } else { REG16(AX) = dst; cpustate->ZF = 0; CYCLES(cpustate,CYCLES_CMPXCHG_REG_MEM_F); } } }
void i386_device::i486_cmpxchg_rm16_r16() // Opcode 0x0f b1 { UINT8 modrm = FETCH(); if( modrm >= 0xc0 ) { UINT16 dst = LOAD_RM16(modrm); UINT16 src = LOAD_REG16(modrm); if( REG16(AX) == dst ) { STORE_RM16(modrm, src); m_ZF = 1; CYCLES(CYCLES_CMPXCHG_REG_REG_T); } else { REG16(AX) = dst; m_ZF = 0; CYCLES(CYCLES_CMPXCHG_REG_REG_F); } } else { UINT32 ea = GetEA(modrm,0); UINT16 dst = READ16(ea); UINT16 src = LOAD_REG16(modrm); if( REG16(AX) == dst ) { WRITE16(ea, src); m_ZF = 1; CYCLES(CYCLES_CMPXCHG_REG_MEM_T); } else { REG16(AX) = dst; m_ZF = 0; CYCLES(CYCLES_CMPXCHG_REG_MEM_F); } } }
static void I486OP(xadd_rm16_r16)(i386_state *cpustate) // Opcode 0x0f c1 { UINT8 modrm = FETCH(cpustate); if( modrm >= 0xc0 ) { UINT16 dst = LOAD_RM16(modrm); UINT16 src = LOAD_REG16(modrm); STORE_RM16(modrm, dst + src); STORE_REG16(modrm, dst); CYCLES(cpustate,CYCLES_XADD_REG_REG); } else { UINT32 ea = GetEA(cpustate,modrm); UINT16 dst = READ16(cpustate,ea); UINT16 src = LOAD_REG16(modrm); WRITE16(cpustate,ea, dst + src); STORE_REG16(modrm, dst); CYCLES(cpustate,CYCLES_XADD_REG_MEM); } }
void i386_device::i486_xadd_rm16_r16() // Opcode 0x0f c1 { UINT8 modrm = FETCH(); if( modrm >= 0xc0 ) { UINT16 dst = LOAD_RM16(modrm); UINT16 src = LOAD_REG16(modrm); STORE_REG16(modrm, dst); STORE_RM16(modrm, dst + src); CYCLES(CYCLES_XADD_REG_REG); } else { UINT32 ea = GetEA(modrm,1); UINT16 dst = READ16(ea); UINT16 src = LOAD_REG16(modrm); WRITE16(ea, dst + src); STORE_REG16(modrm, dst); CYCLES(CYCLES_XADD_REG_MEM); } }