math.h 645 Bytes
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#ifndef __MATH_H__
#define __MATH_H__

static inline int max(int a, int b)
{
    if(a > b)
        return a;

    return b;
}

static inline int fls(int x)
{
    int r = 32;

    if (!x)
        return 0;
    if (!(x & 0xffff0000u)) {
        x <<= 16;
        r -= 16;
    }
    if (!(x & 0xff000000u)) {
        x <<= 8;
        r -= 8;
    }
    if (!(x & 0xf0000000u)) {
        x <<= 4;
        r -= 4;
    }
    if (!(x & 0xc0000000u)) {
        x <<= 2;
        r -= 2;
    }
    if (!(x & 0x80000000u)) {
        x <<= 1;
        r -= 1;
    }
    return r;
}

#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))

#endif /* __MATH_H__ */