Function findHighestSetBit

src/include/clblas_stddef.h:83–94

* Return zero based sequential number of the highest set bit the * number. If the number is 0, then the function returns -1. */

 * number. If the number is 0, then the function returns -1.
 */
static __inline int
findHighestSetBit(size_t a)
{
    int n = (sizeof(size_t) * 8 - 1);
    size_t s = (size_t)1 << n;

    for (; (s != 0) && !(s & a); s >>= 1) {
        n--;
    }

    return (s == 0) ? -1 : n;
}

static __inline size_t
roundDownPow2(size_t a)