strings.h File Reference

#include <stddef.h>
#include <stdint.h>

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

Function Documentation

fls()

int fls

(

int

mask

)

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

Finds the last (most significant) bit set in the given (int) 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 68 of file fls.c.

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

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

flsl()

int flsl

(

long

mask

)

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

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

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

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

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);
}