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Code Issues Releases Activity

avutil/intmath: enable builtin intrinsics for icl and msvc.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Matthew Oliver 2014-10-27 01:43:15 +11:00 committed by Michael Niedermayer
parent c0002ddb01
commit 2060f4cbba
1 changed files with 36 additions and 4 deletions
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40
libavutil/intmath.h
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@ -35,21 +35,29 @@
* @{
*/
#if HAVE_FAST_CLZ && AV_GCC_VERSION_AT_LEAST(3,4)
#if HAVE_FAST_CLZ
#if AV_GCC_VERSION_AT_LEAST(3,4)
#ifndef ff_log2
# define ff_log2(x) (31 - __builtin_clz((x)|1))
# ifndef ff_log2_16bit
# define ff_log2_16bit av_log2
# endif
#endif /* ff_log2 */
#elif defined( __INTEL_COMPILER )
#ifndef ff_log2
# define ff_log2(x) (_bit_scan_reverse(x|1))
# ifndef ff_log2_16bit
# define ff_log2_16bit av_log2
# endif
#endif /* ff_log2 */
#endif
#endif /* AV_GCC_VERSION_AT_LEAST(3,4) */
extern const uint8_t ff_log2_tab[256];
#ifndef ff_log2
#define ff_log2 ff_log2_c
#if !defined( _MSC_VER )
static av_always_inline av_const int ff_log2_c(unsigned int v)
{
int n = 0;
@ -65,6 +73,15 @@ static av_always_inline av_const int ff_log2_c(unsigned int v)
return n;
}
#else
static av_always_inline av_const int ff_log2_c(unsigned int v)
{
unsigned long n;
_BitScanReverse(&n, v|1);
return n;
}
#define ff_log2_16bit av_log2
#endif
#endif
#ifndef ff_log2_16bit
@ -94,14 +111,21 @@ static av_always_inline av_const int ff_log2_16bit_c(unsigned int v)
* @{
*/
#if HAVE_FAST_CLZ && AV_GCC_VERSION_AT_LEAST(3,4)
#if HAVE_FAST_CLZ
#if AV_GCC_VERSION_AT_LEAST(3,4)
#ifndef ff_ctz
#define ff_ctz(v) __builtin_ctz(v)
#endif
#elif defined( __INTEL_COMPILER )
#ifndef ff_ctz
#define ff_ctz(v) _bit_scan_forward(v)
#endif
#endif
#endif
#ifndef ff_ctz
#define ff_ctz ff_ctz_c
#if !defined( _MSC_VER )
static av_always_inline av_const int ff_ctz_c(int v)
{
int c;
@ -130,6 +154,14 @@ static av_always_inline av_const int ff_ctz_c(int v)
return c;
}
#else
static av_always_inline av_const int ff_ctz_c( int v )
{
unsigned long c;
_BitScanForward(&c, v);
return c;
}
#endif
#endif
/**