x86: Only use optimizations with cmov if the CPU supports the instruction

libavcodec/x86/dsputil_mmx.c

@@ -2829,7 +2829,8 @@ static void dsputil_init_3dnow(DSPContext *c, AVCodecContext *avctx,
     c->vorbis_inverse_coupling = vorbis_inverse_coupling_3dnow;
 
 #if HAVE_7REGS
-    c->add_hfyu_median_prediction = add_hfyu_median_prediction_cmov;
+    if (mm_flags & AV_CPU_FLAG_CMOV)
+        c->add_hfyu_median_prediction = add_hfyu_median_prediction_cmov;
 #endif
 }
 

libavcodec/x86/h264_intrapred_init.c

@@ -188,7 +188,8 @@ void ff_h264_pred_init_x86(H264PredContext *h, int codec_id, const int bit_depth
                 if (chroma_format_idc == 1)
                     h->pred8x8  [PLANE_PRED8x8] = ff_pred8x8_plane_mmx;
                 if (codec_id == CODEC_ID_SVQ3) {
-                    h->pred16x16[PLANE_PRED8x8] = ff_pred16x16_plane_svq3_mmx;
+                    if (mm_flags & AV_CPU_FLAG_CMOV)
+                        h->pred16x16[PLANE_PRED8x8] = ff_pred16x16_plane_svq3_mmx;
                 } else if (codec_id == CODEC_ID_RV40) {
                     h->pred16x16[PLANE_PRED8x8] = ff_pred16x16_plane_rv40_mmx;
                 } else {

libavcodec/x86/h264dsp_mmx.c

@@ -361,7 +361,8 @@ void ff_h264dsp_init_x86(H264DSPContext *c, const int bit_depth, const int chrom
         if (chroma_format_idc == 1)
             c->h264_idct_add8       = ff_h264_idct_add8_8_mmx;
         c->h264_idct_add16intra     = ff_h264_idct_add16intra_8_mmx;
-        c->h264_luma_dc_dequant_idct= ff_h264_luma_dc_dequant_idct_mmx;
+        if (mm_flags & AV_CPU_FLAG_CMOV)
+            c->h264_luma_dc_dequant_idct = ff_h264_luma_dc_dequant_idct_mmx;
 
         if (mm_flags & AV_CPU_FLAG_MMX2) {
             c->h264_idct_dc_add    = ff_h264_idct_dc_add_8_mmx2;