flsll.c File Reference

#include <strings.h>

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Functions
int	flsll (long long mask)
	Finds the last (most significant) bit set in the given mask. More...

Function Documentation

flsll()

int flsll

(

long long

mask

)

Finds the last (most significant) bit set in the given mask.

Finds the last (most significant) bit set in the given (long long) mask and return the index of that bit.

Bits are numbered starting at 1, the least significant bit.

Parameters

mask	The bit mask

Returns

The index of the bit if mask is not zero, 0 otherwise.

Definition at line 62 of file flsll.c.

{
    if(mask == 0)
    {
        {
            return (0);
        }
    }

    return ((int)sizeof(mask) << 3) - __builtin_clzll((unsigned long long)mask);
}