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

[Michael Niedermayer]

ffmpeg | branch: release/2.0 | Michael Niedermayer <michaelni at gmx.at> | Tue May 20 05:23:52 2014 +0200| [332777970c8b430cd29cb945855c4cc3f20946ee] | 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>
(cherry picked from commit 6310eb8010b7a3b3016e297132380cbd4e3d2d10)

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=332777970c8b430cd29cb945855c4cc3f20946ee
---

 libavutil/cpu.c |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/libavutil/cpu.c b/libavutil/cpu.c
index cdea209..55e8b4e 100644
--- a/libavutil/cpu.c
+++ b/libavutil/cpu.c
@@ -45,6 +45,24 @@
 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_FMA4     ))
+        && !(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;
 }