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Steve Lhomme
VLC
Commits
3c6a0755
Commit
3c6a0755
authored
Feb 07, 2010
by
Rémi Denis-Courmont
Browse files
clz: count leading zeroes
parent
44c71045
Changes
1
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include/vlc_common.h
View file @
3c6a0755
...
...
@@ -621,6 +621,29 @@ static inline uint8_t clip_uint8_vlc( int32_t a )
else
return
a
;
}
/* Count leading zeroes */
LIBVLC_USED
static
inline
unsigned
clz
(
unsigned
x
)
{
#ifdef __GNUC_
return
__builtin_clz
(
x
);
#else
unsigned
i
=
sizeof
(
x
)
*
8
;
while
(
x
)
{
x
=
x
>>
1
;
i
--
;
}
return
i
;
#endif
}
#define clz8( x ) (clz(x) - ((sizeof(unsigned) - sizeof (uint8_t)) * 8))
#define clz16( x ) (clz(x) - ((sizeof(unsigned) - sizeof (uint16_t)) * 8))
/* XXX: this assumes that int is 32-bits or more */
#define clz32( x ) (clz(x) - ((sizeof(unsigned) - sizeof (uint32_t)) * 8))
/* Free and set set the variable to NULL */
#define FREENULL(a) do { free( a ); a = NULL; } while(0)
...
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