x86: use more standard construct for setting ASM functions in FFT code

Signed-off-by: Diego Biurrun <diego@biurrun.de>

libavcodec/x86/fft.c

@@ -25,30 +25,31 @@ av_cold void ff_fft_init_mmx(FFTContext *s)
 {
 #if HAVE_YASM
     int has_vectors = av_get_cpu_flags();
-    if (has_vectors & AV_CPU_FLAG_AVX && HAVE_AVX && s->nbits >= 5) {
-        /* AVX for SB */
-        s->imdct_calc      = ff_imdct_calc_sse;
-        s->imdct_half      = ff_imdct_half_avx;
-        s->fft_permute     = ff_fft_permute_sse;
-        s->fft_calc        = ff_fft_calc_avx;
-        s->fft_permutation = FF_FFT_PERM_AVX;
-    } else if (has_vectors & AV_CPU_FLAG_SSE && HAVE_SSE) {
+    if (has_vectors & AV_CPU_FLAG_3DNOW && HAVE_AMD3DNOW) {
+        /* 3DNow! for K6-2/3 */
+        s->imdct_calc = ff_imdct_calc_3dn;
+        s->imdct_half = ff_imdct_half_3dn;
+        s->fft_calc   = ff_fft_calc_3dn;
+    }
+    if (has_vectors & AV_CPU_FLAG_3DNOWEXT && HAVE_AMD3DNOWEXT) {
+        /* 3DNowEx for K7 */
+        s->imdct_calc = ff_imdct_calc_3dn2;
+        s->imdct_half = ff_imdct_half_3dn2;
+        s->fft_calc   = ff_fft_calc_3dn2;
+    }
+    if (has_vectors & AV_CPU_FLAG_SSE && HAVE_SSE) {
         /* SSE for P3/P4/K8 */
         s->imdct_calc  = ff_imdct_calc_sse;
         s->imdct_half  = ff_imdct_half_sse;
         s->fft_permute = ff_fft_permute_sse;
         s->fft_calc    = ff_fft_calc_sse;
         s->fft_permutation = FF_FFT_PERM_SWAP_LSBS;
-    } else if (has_vectors & AV_CPU_FLAG_3DNOWEXT && HAVE_AMD3DNOWEXT) {
-        /* 3DNowEx for K7 */
-        s->imdct_calc = ff_imdct_calc_3dn2;
-        s->imdct_half = ff_imdct_half_3dn2;
-        s->fft_calc   = ff_fft_calc_3dn2;
-    } else if (has_vectors & AV_CPU_FLAG_3DNOW && HAVE_AMD3DNOW) {
-        /* 3DNow! for K6-2/3 */
-        s->imdct_calc = ff_imdct_calc_3dn;
-        s->imdct_half = ff_imdct_half_3dn;
-        s->fft_calc   = ff_fft_calc_3dn;
+    }
+    if (has_vectors & AV_CPU_FLAG_AVX && HAVE_AVX && s->nbits >= 5) {
+        /* AVX for SB */
+        s->imdct_half      = ff_imdct_half_avx;
+        s->fft_calc        = ff_fft_calc_avx;
+        s->fft_permutation = FF_FFT_PERM_AVX;
     }
 #endif
 }
@@ -58,12 +59,12 @@ av_cold void ff_dct_init_mmx(DCTContext *s)
 {
 #if HAVE_YASM
     int has_vectors = av_get_cpu_flags();
+    if (has_vectors & AV_CPU_FLAG_SSE && HAVE_SSE)
+        s->dct32 = ff_dct32_float_sse;
+    if (has_vectors & AV_CPU_FLAG_SSE2 && HAVE_SSE)
+        s->dct32 = ff_dct32_float_sse2;
     if (has_vectors & AV_CPU_FLAG_AVX && HAVE_AVX)
         s->dct32 = ff_dct32_float_avx;
-    else if (has_vectors & AV_CPU_FLAG_SSE2 && HAVE_SSE)
-        s->dct32 = ff_dct32_float_sse2;
-    else if (has_vectors & AV_CPU_FLAG_SSE && HAVE_SSE)
-        s->dct32 = ff_dct32_float_sse;
 #endif
 }
 #endif