/*
 * Copyright (c) Hisilicon Technologies Co., Ltd. 2014-2020. All rights reserved.
 * Description: bits.c
 * Author: SmartMedia_BSP
 * Create: 2014-06-04
 */

#include <stddef.h>

int bits_count(uint32 nn)
{
    int count = 0;
    while (nn) {
        if (nn & 1) {
            count++;
        }
        nn >>= 1;
    }
    return count;
}

int ffs(int nn)
{
    int pos = 1;
    unsigned int mask = 0xFFFF;
    unsigned int shift = 16; /* 16:number */

    if (!nn) {
        return 0;
    }
    while (shift) {
        if (!((unsigned int)nn & mask)) {
            nn = (unsigned int)nn >> shift;
            pos += shift;
        }
        shift >>= 1;
        mask >>= shift;
    }
    return pos;
}

int ffs64(uint64 nn)
{
    int pos = 1;
    uint32 mask = 0xFFFFFFFF;
    uint32 shift = 32; /* 32:number */

    if (!nn) {
        return 0;
    }
    while (shift) {
        if (!(nn & mask)) {
            nn >>= shift;
            pos += shift;
        }
        shift >>= 1;
        mask >>= shift;
    }
    return pos;
}