Function clz32

cmp_compressonatorlib/astc/astc_encode_kernel.cpp:8027–8042

32-bit count-leading-zeroes function: use the Assembly instruction whenever possible. */

/* 32-bit count-leading-zeroes function: use the Assembly instruction whenever possible. */
uint32_t clz32(uint32_t inp)
{
    /* slow default version */
    uint32_t summa = 24;
    if (inp >= (uint32_t)(0x10000))
    {
        inp >>= 16;
        summa -= 16;
    }
    if (inp >= (uint32_t)(0x100))
    {
        inp >>= 8;
        summa -= 8;
    }
    return summa + clz_table[inp];
}

/* convert from FP16 to FP32. */
CGU_UINT sf16_to_sf32(CGU_SHORT inp)