From: Ronald S. Bultje <rsbul...@gmail.com>
Signed-off-by: Diego Biurrun <di...@biurrun.de>
---
configure | 3 +++
libavutil/internal.h | 7 +++++--
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/configure b/configure
index 3c82eaa..7ef1025 100755
--- a/configure
+++ b/configure
@@ -1118,6 +1118,7 @@ HAVE_LIST="
MapViewOfFile
memalign
mkstemp
+ mm_empty
mmap
nanosleep
netinet_sctp_h
@@ -2746,6 +2747,8 @@ elif enabled x86; then
check_code ld intrin.h "__rdtsc()" && enable rdtsc
+ check_code ld mmintrin.h "_mm_empty()" && enable mm_empty
+
enable local_aligned_8 local_aligned_16
# check whether EBP is available on x86
diff --git a/libavutil/internal.h b/libavutil/internal.h
index 41e8a9a..e8bcca5 100644
--- a/libavutil/internal.h
+++ b/libavutil/internal.h
@@ -231,7 +231,7 @@ struct AVDictionary {
# define ONLY_IF_THREADS_ENABLED(x) NULL
#endif
-#if HAVE_MMX
+#if HAVE_MMX && HAVE_INLINE_ASM
/**
* Empty mmx state.
* this must be called between any dsp function and float/double code.
@@ -241,8 +241,11 @@ static av_always_inline void emms_c(void)
{
__asm__ volatile ("emms" ::: "memory");
}
+#elif HAVE_MMX && HAVE_MM_EMPTY
+# include <mmintrin.h>
+# define emms_c _mm_empty
#else /* HAVE_MMX */
-#define emms_c()
+# define emms_c()
#endif /* HAVE_MMX */
#endif /* AVUTIL_INTERNAL_H */
--
1.7.1
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