[FFmpeg-cvslog] avutil/cpu: force mmx on selection of higher x86 SIMD features

Michael Niedermayer git at videolan.org
Tue May 20 06:24:30 CEST 2014


ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Tue May 20 05:23:52 2014 +0200| [6310eb8010b7a3b3016e297132380cbd4e3d2d10] | committer: Michael Niedermayer

avutil/cpu: force mmx on selection of higher x86 SIMD features

Fixes various runtime failures with manually set flags that represent no
existing CPU

Fixes Ticket3653

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6310eb8010b7a3b3016e297132380cbd4e3d2d10
---

 libavutil/cpu.c |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/libavutil/cpu.c b/libavutil/cpu.c
index c4517ba..454326c 100644
--- a/libavutil/cpu.c
+++ b/libavutil/cpu.c
@@ -47,6 +47,26 @@
 static int flags, checked;
 
 void av_force_cpu_flags(int arg){
+    if (   (arg & ( AV_CPU_FLAG_3DNOW    |
+                    AV_CPU_FLAG_3DNOWEXT |
+                    AV_CPU_FLAG_SSE      |
+                    AV_CPU_FLAG_SSE2     |
+                    AV_CPU_FLAG_SSE2SLOW |
+                    AV_CPU_FLAG_SSE3     |
+                    AV_CPU_FLAG_SSE3SLOW |
+                    AV_CPU_FLAG_SSSE3    |
+                    AV_CPU_FLAG_SSE4     |
+                    AV_CPU_FLAG_SSE42    |
+                    AV_CPU_FLAG_AVX      |
+                    AV_CPU_FLAG_XOP      |
+                    AV_CPU_FLAG_FMA3     |
+                    AV_CPU_FLAG_FMA4     |
+                    AV_CPU_FLAG_AVX2     ))
+        && !(arg & AV_CPU_FLAG_MMX)) {
+        av_log(NULL, AV_LOG_WARNING, "MMX implied by specified flags\n");
+        arg |= AV_CPU_FLAG_MMX;
+    }
+
     flags   = arg;
     checked = arg != -1;
 }



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