avutil/avassert: Deprecate av_assert0_fpu()

Said function has presumably been added in order to check
that we have successfully reset the floating point state
after having violated the ABI/calling convention by not
issuing emms in our MMX DSP routines.

Yet the ability to check this should not have been made public,
because there is no external need for it and because the
function does not even always achieve what its documentation
claims to do: It only works when inline assembly is available.
It should have been implemented in emms.h like emms_c()
(which is where a replacement should be put if there is still
ABI-violating MMX code when av_assert0_fpu() is removed).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

doc/APIchanges

@@ -2,6 +2,9 @@ The last version increases of all libraries were on 2025-03-28
 
 API changes, most recent first:
 
+2026-02-13 - xxxxxxxxxx - lavu 60.25.100 - avassert.h
+  Deprecate av_assert0_fpu() and av_assert2_fpu() without replacement.
+
 2026-02-xx - xxxxxxxxxx - lavf 62.9.100 - avformat.h
   Add AVFormatContext.name.
 

libavutil/avassert.h

@@ -34,6 +34,7 @@
 #include "attributes.h"
 #include "log.h"
 #include "macros.h"
+#include "version.h"
 
 /**
  * assert() equivalent, that is always enabled.
@@ -63,18 +64,25 @@
  */
 #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
 
+#if FF_API_ASSERT_FPU
+#if defined(ASSERT_LEVEL) && ASSERT_LEVEL > 1
+#define av_assert2_fpu() av_assert0_fpu()
+#else
+#define av_assert2_fpu() ((void)0)
+#endif
 /**
  * Assert that floating point operations can be executed.
  *
  * This will av_assert0() that the cpu is not in MMX state on X86
+ * @deprecated without replacement
  */
+attribute_deprecated
 void av_assert0_fpu(void);
+#endif
 
 /**
  * Asserts that are used as compiler optimization hints depending

libavutil/utils.c

@@ -99,7 +99,7 @@ AVRational av_get_time_base_q(void)
 {
     return (AVRational){1, AV_TIME_BASE};
 }
-
+#if FF_API_ASSERT_FPU
 void av_assert0_fpu(void) {
 #if HAVE_MMX_INLINE
     uint16_t state[14];
@@ -112,3 +112,4 @@ void av_assert0_fpu(void) {
     av_assert0((state[4] & 3) == 3);
 #endif
 }
+#endif

libavutil/version.h

@@ -79,7 +79,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  60
-#define LIBAVUTIL_VERSION_MINOR  24
+#define LIBAVUTIL_VERSION_MINOR  25
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
@@ -112,6 +112,7 @@
 #define FF_API_OPT_PTR                  (LIBAVUTIL_VERSION_MAJOR < 61)
 #define FF_API_CPU_FLAG_FORCE           (LIBAVUTIL_VERSION_MAJOR < 61)
 #define FF_API_DOVI_L11_INVALID_PROPS   (LIBAVUTIL_VERSION_MAJOR < 61)
+#define FF_API_ASSERT_FPU               (LIBAVUTIL_VERSION_MAJOR < 61)
 
 /**
  * @}