From: "Ronald S. Bultje" <[email protected]>
---
configure | 9 +++++++++
libavutil/internal.h | 6 +++++-
2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/configure b/configure
index 351d8a0..4fc20a2 100755
--- a/configure
+++ b/configure
@@ -1118,7 +1118,9 @@ HAVE_LIST="
MapViewOfFile
memalign
mkstemp
+ mm_empty
mmap
+ mmintrin_h
nanosleep
netinet_sctp_h
poll_h
@@ -2646,6 +2648,13 @@ check_cc <<EOF && enable inline_asm
void foo(void) { __asm__ volatile ("" ::); }
EOF
+if check_header mmintrin.h; then
+ check_cc <<EOF && enable mm_empty
+#include <mmintrin.h>
+int main (void) { _mm_empty(); return 0; }
+EOF
+fi
+
_restrict=
for restrict_keyword in restrict __restrict__ __restrict; do
check_cc <<EOF && _restrict=$restrict_keyword && break
diff --git a/libavutil/internal.h b/libavutil/internal.h
index 41e8a9a..81426af 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.
@@ -241,6 +241,10 @@ 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()
#endif /* HAVE_MMX */
--
1.7.9.5
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