Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> --- libavutil/avassert.h | 9 +++++++++ libavutil/utils.c | 13 +++++++++++++ 2 files changed, 22 insertions(+)
diff --git a/libavutil/avassert.h b/libavutil/avassert.h index f473637..46f3fea 100644 --- a/libavutil/avassert.h +++ b/libavutil/avassert.h @@ -59,8 +59,17 @@ */ #if defined(ASSERT_LEVEL) && ASSERT_LEVEL > 1 #define av_assert2(cond) av_assert0(cond) +#define av_assert2_fpu() av_assert0_fpu() #else #define av_assert2(cond) ((void)0) +#define av_assert2_fpu() ((void)0) #endif +/** + * Assert that floating point opperations can be executed. + * + * This will av_assert0() that the cpu is not in MMX state on X86 + */ +void av_assert0_fpu(void); + #endif /* AVUTIL_AVASSERT_H */ diff --git a/libavutil/utils.c b/libavutil/utils.c index f409f32..36e4dd5 100644 --- a/libavutil/utils.c +++ b/libavutil/utils.c @@ -125,3 +125,16 @@ AVRational av_get_time_base_q(void) { return (AVRational){1, AV_TIME_BASE}; } + +void av_assert0_fpu(void) { +#if HAVE_MMX_INLINE + uint16_t state[14]; + __asm volatile ( + "fstenv %0 \n\t" + : "+m" (state) + : + : "memory" + ); + av_assert0((state[4] & 3) == 3); +#endif +} -- 2.10.1 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel