static int
opAAA(uint32_t fetchdat)
{
    flags_rebuild();
    if ((cpu_state.flags & A_FLAG) || ((AL & 0xF) > 9)) {
        /* On 286, it's indeed AX - behavior difference from 808x. */
        AX += 6;
        AH++;
        cpu_state.flags |= (A_FLAG | C_FLAG);
    } else
        cpu_state.flags &= ~(A_FLAG | C_FLAG);
    AL &= 0xF;
    CLOCK_CYCLES(is486 ? 3 : 4);
    PREFETCH_RUN(is486 ? 3 : 4, 1, -1, 0, 0, 0, 0, 0);
    return 0;
}

static int
opAAD(uint32_t fetchdat)
{
    int base = getbytef();

    if (!cpu_isintel)
        base = 10;
    AL = (AH * base) + AL;
    AH = 0;
    setznp16(AX);
    CLOCK_CYCLES((is486) ? 14 : 19);
    PREFETCH_RUN(is486 ? 14 : 19, 2, -1, 0, 0, 0, 0, 0);
    return 0;
}

static int
opAAM(uint32_t fetchdat)
{
    int base = getbytef();

    if (!base || !cpu_isintel)
        base = 10;
    AH = AL / base;
    AL %= base;
    setznp16(AX);
    CLOCK_CYCLES((is486) ? 15 : 17);
    PREFETCH_RUN(is486 ? 15 : 17, 2, -1, 0, 0, 0, 0, 0);
    return 0;
}

static int
opAAS(uint32_t fetchdat)
{
    flags_rebuild();
    if ((cpu_state.flags & A_FLAG) || ((AL & 0xF) > 9)) {
        /* On 286, it's indeed AX - behavior difference from 808x. */
        AX -= 6;
        AH--;
        cpu_state.flags |= (A_FLAG | C_FLAG);
    } else
        cpu_state.flags &= ~(A_FLAG | C_FLAG);
    AL &= 0xF;
    CLOCK_CYCLES(is486 ? 3 : 4);
    PREFETCH_RUN(is486 ? 3 : 4, 1, -1, 0, 0, 0, 0, 0);
    return 0;
}

static int
opDAA(uint32_t fetchdat)
{
    uint16_t tempw;
    uint16_t old_AL;
    uint16_t old_CF;

    flags_rebuild();
    old_AL = AL;
    old_CF = cpu_state.flags & C_FLAG;
    cpu_state.flags &= ~C_FLAG;

    if (((AL & 0xf) > 9) || (cpu_state.flags & A_FLAG)) {
        int tempi = ((uint16_t) AL) + 6;
        AL += 6;
        if (old_CF || (tempi & 0x100))
            cpu_state.flags |= C_FLAG;
        cpu_state.flags |= A_FLAG;
    } else
        cpu_state.flags &= ~A_FLAG;

    if ((old_AL > 0x99) || old_CF) {
        AL += 0x60;
        cpu_state.flags |= C_FLAG;
    } else
        cpu_state.flags &= ~C_FLAG;

    tempw = cpu_state.flags & (C_FLAG | A_FLAG);
    setznp8(AL);
    flags_rebuild();
    cpu_state.flags = (cpu_state.flags & ~(C_FLAG | A_FLAG)) | tempw;
    CLOCK_CYCLES(4);
    PREFETCH_RUN(4, 1, -1, 0, 0, 0, 0, 0);

    return 0;
}

static int
opDAS(uint32_t fetchdat)
{
    uint16_t tempw;
    uint16_t old_AL;
    uint16_t old_CF;

    flags_rebuild();
    old_AL = AL;
    old_CF = cpu_state.flags & C_FLAG;
    cpu_state.flags &= ~C_FLAG;

    if (((AL & 0xf) > 9) || (cpu_state.flags & A_FLAG)) {
        int tempi = ((uint16_t) AL) - 6;
        AL -= 6;
        if (old_CF || (tempi & 0x100))
            cpu_state.flags |= C_FLAG;
        cpu_state.flags |= A_FLAG;
    } else
        cpu_state.flags &= ~A_FLAG;

    if ((old_AL > 0x99) || old_CF) {
        AL -= 0x60;
        cpu_state.flags |= C_FLAG;
    }

    tempw = cpu_state.flags & (C_FLAG | A_FLAG);
    setznp8(AL);
    flags_rebuild();
    cpu_state.flags = (cpu_state.flags & ~(C_FLAG | A_FLAG)) | tempw;
    CLOCK_CYCLES(4);
    PREFETCH_RUN(4, 1, -1, 0, 0, 0, 0, 0);

    return 0;
}