fmtconvert: check compile-time x86 instruction set flags

libavcodec/x86/fmtconvert_mmx.c

@@ -208,19 +208,19 @@ void ff_fmt_convert_init_x86(FmtConvertContext *c, AVCodecContext *avctx)
 #if HAVE_YASM
         c->float_interleave = float_interleave_mmx;
 
-        if(mm_flags & AV_CPU_FLAG_3DNOW){
+        if (HAVE_AMD3DNOW && mm_flags & AV_CPU_FLAG_3DNOW) {
             if(!(avctx->flags & CODEC_FLAG_BITEXACT)){
                 c->float_to_int16 = ff_float_to_int16_3dnow;
                 c->float_to_int16_interleave = float_to_int16_interleave_3dnow;
             }
         }
-        if(mm_flags & AV_CPU_FLAG_3DNOWEXT){
+        if (HAVE_AMD3DNOWEXT && mm_flags & AV_CPU_FLAG_3DNOWEXT) {
             if(!(avctx->flags & CODEC_FLAG_BITEXACT)){
                 c->float_to_int16_interleave = float_to_int16_interleave_3dn2;
             }
         }
 #endif
-        if(mm_flags & AV_CPU_FLAG_SSE){
+        if (HAVE_SSE && mm_flags & AV_CPU_FLAG_SSE) {
             c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_sse;
 #if HAVE_YASM
             c->float_to_int16 = ff_float_to_int16_sse;
@@ -228,7 +228,7 @@ void ff_fmt_convert_init_x86(FmtConvertContext *c, AVCodecContext *avctx)
             c->float_interleave = float_interleave_sse;
 #endif
         }
-        if(mm_flags & AV_CPU_FLAG_SSE2){
+        if (HAVE_SSE && mm_flags & AV_CPU_FLAG_SSE2) {
             c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_sse2;
 #if HAVE_YASM
             c->float_to_int16 = ff_float_to_int16_sse2;