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Add new clz function which works with input 0.

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Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
This commit is contained in:
Miroslav Lichvar
2012-08-28 11:58:40 +02:00
committed by Erik de Castro Lopo
parent d69e807e10
commit 7b37472a2f
1 changed files with 8 additions and 1 deletions
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9
src/libFLAC/include/private/bitmath.h
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@@ -64,7 +64,6 @@ static inline unsigned int FLAC__clz_soft_uint32(unsigned int word)
}; };
return (word) > 0xffffff ? byte_to_unary_table[(word) >> 24] : return (word) > 0xffffff ? byte_to_unary_table[(word) >> 24] :
!(word) ? 32 :
(word) > 0xffff ? byte_to_unary_table[(word) >> 16] + 8 : (word) > 0xffff ? byte_to_unary_table[(word) >> 16] + 8 :
(word) > 0xff ? byte_to_unary_table[(word) >> 8] + 16 : (word) > 0xff ? byte_to_unary_table[(word) >> 8] + 16 :
byte_to_unary_table[(word)] + 24; byte_to_unary_table[(word)] + 24;
@@ -88,6 +87,14 @@ static inline unsigned int FLAC__clz_uint32(FLAC__uint32 v)
#endif #endif
} }
/* This one works with input 0 */
static inline unsigned int FLAC__clz2_uint32(FLAC__uint32 v)
{
if (!v)
return 32;
return FLAC__clz_uint32(v);
}
/* An example of what FLAC__bitmath_ilog2() computes: /* An example of what FLAC__bitmath_ilog2() computes:
* *
* ilog2( 0) = undefined * ilog2( 0) = undefined