enum svp64_reg_category {
    SVP64_REG_CATEGORY_UNKNOWN,
    SVP64_REG_CATEGORY_GPR,
    SVP64_REG_CATEGORY_FPR,
    SVP64_REG_CATEGORY_CR_3BIT,
    SVP64_REG_CATEGORY_CR_5BIT,
};

enum svp64_reg_category
svp64_reg_category(unsigned char type)
{
    size_t i;
    static struct {
        unsigned char type;
        unsigned char category;
    } const table[] = {
        {BF  , SVP64_REG_CATEGORY_CR_3BIT},
        {BFA , SVP64_REG_CATEGORY_CR_3BIT},
        {BA  , SVP64_REG_CATEGORY_CR_5BIT},
        {BB  , SVP64_REG_CATEGORY_CR_5BIT},
        {BC  , SVP64_REG_CATEGORY_CR_5BIT},
        {BI  , SVP64_REG_CATEGORY_CR_5BIT},
        {BT  , SVP64_REG_CATEGORY_CR_5BIT},
        {RA  , SVP64_REG_CATEGORY_GPR},
        {RB  , SVP64_REG_CATEGORY_GPR},
        {RC  , SVP64_REG_CATEGORY_GPR},
        {RS  , SVP64_REG_CATEGORY_GPR},
        {RT  , SVP64_REG_CATEGORY_GPR},
        {FRA , SVP64_REG_CATEGORY_FPR},
        {FRB , SVP64_REG_CATEGORY_FPR},
        {FRC , SVP64_REG_CATEGORY_FPR},
        {FRS , SVP64_REG_CATEGORY_FPR},
        {FRT , SVP64_REG_CATEGORY_FPR},
    };

    for (i = 0; i < sizeof (table) / sizeof (table[0]); ++i) {
        if (table[i].type == type)
            return (enum svp64_reg_category)table[i].category;
    }

    return SVP64_REG_CATEGORY_UNKNOWN;
}