[FFmpeg-cvslog] avutil/avassert: Add av_assertX_fpu()

Michael Niedermayer git at videolan.org
Sat Oct 22 15:28:11 EEST 2016


ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri Oct 21 12:50:03 2016 +0200| [f5495c970cf2a8745a2f4520d543cb215c06e545] | committer: Michael Niedermayer

avutil/avassert: Add av_assertX_fpu()

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f5495c970cf2a8745a2f4520d543cb215c06e545
---

 doc/APIchanges       |  3 +++
 libavutil/avassert.h |  9 +++++++++
 libavutil/utils.c    | 13 +++++++++++++
 libavutil/version.h  |  2 +-
 4 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/doc/APIchanges b/doc/APIchanges
index 130638b..502ab3f 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -15,6 +15,9 @@ libavutil:     2015-08-28
 
 API changes, most recent first:
 
+2016-10-22 - xxxxxxx - lavu 55.33.100 - avassert.h
+  Add av_assert0_fpu() / av_assert2_fpu()
+
 2016-xx-xx - xxxxxxx - lavc 57.61.100 / lavc 57.24.0 - avcodec.h
   Decoders now export the frame timestamp as AVFrame.pts. It was
   previously exported as AVFrame.pkt_pts, which is now deprecated.
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
+}
diff --git a/libavutil/version.h b/libavutil/version.h
index 8a41ef6..5ee6e6d 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -79,7 +79,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  55
-#define LIBAVUTIL_VERSION_MINOR  32
+#define LIBAVUTIL_VERSION_MINOR  33
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \



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