[FFmpeg-cvslog] avcodec/dca_core: Only call emms_c() if needed

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Thu Sep  8 15:09:26 2022 +0200| [df215e575850e41b19aeb1fd99e53372a6b3d537] | committer: Andreas Rheinhardt

avcodec/dca_core: Only call emms_c() if needed

It is not needed on x64, because the AV_COPY* and AV_ZERO*
macros never use MMX on x64.

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=df215e575850e41b19aeb1fd99e53372a6b3d537
---

 libavcodec/dca_core.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/libavcodec/dca_core.c b/libavcodec/dca_core.c
index 1655116eed..bbf36ea678 100644
--- a/libavcodec/dca_core.c
+++ b/libavcodec/dca_core.c
@@ -767,7 +767,9 @@ static void erase_adpcm_history(DCACoreDecoder *s)
         for (band = 0; band < DCA_SUBBANDS; band++)
             AV_ZERO128(s->subband_samples[ch][band] - DCA_ADPCM_COEFFS);
 
+#ifdef FF_COPY_SWAP_ZERO_USES_MMX
     emms_c();
+#endif
 }
 
 static int alloc_sample_buffer(DCACoreDecoder *s)
@@ -831,7 +833,9 @@ static int parse_frame_data(DCACoreDecoder *s, enum HeaderType header, int xch_b
         }
     }
 
+#ifdef FF_COPY_SWAP_ZERO_USES_MMX
     emms_c();
+#endif
 
     return 0;
 }
@@ -1276,7 +1280,9 @@ static void erase_x96_adpcm_history(DCACoreDecoder *s)
         for (band = 0; band < DCA_SUBBANDS_X96; band++)
             AV_ZERO128(s->x96_subband_samples[ch][band] - DCA_ADPCM_COEFFS);
 
+#ifdef FF_COPY_SWAP_ZERO_USES_MMX
     emms_c();
+#endif
 }
 
 static int alloc_x96_sample_buffer(DCACoreDecoder *s)
@@ -1506,7 +1512,9 @@ static int parse_x96_frame_data(DCACoreDecoder *s, int exss, int xch_base)
         }
     }
 
+#ifdef FF_COPY_SWAP_ZERO_USES_MMX
     emms_c();
+#endif
 
     return 0;
 }