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Code Issues Releases Activity

avutil/intmath: check for ICC before GCC

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Intel compiler also defines __GNUC__, so the Intel specific intrinsics were not
really being used.

Reviewed-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2015-07-18 16:52:42 -03:00
parent 9a829a2b6a
commit 78347549a4
1 changed files with 14 additions and 14 deletions
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28
libavutil/intmath.h
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@ -39,22 +39,22 @@
*/
#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 )
#if 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
#elif 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 */
#endif /* AV_GCC_VERSION_AT_LEAST(3,4) */
#endif
extern const uint8_t ff_log2_tab[256];
@ -115,14 +115,14 @@ static av_always_inline av_const int ff_log2_16bit_c(unsigned int v)
*/
#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 )
#if defined( __INTEL_COMPILER )
#ifndef ff_ctz
#define ff_ctz(v) _bit_scan_forward(v)
#endif
#elif AV_GCC_VERSION_AT_LEAST(3,4)
#ifndef ff_ctz
#define ff_ctz(v) __builtin_ctz(v)
#endif
#endif
#endif