swresample/x86/audio_convert: Remove obsolete MMX functions

x64 always has MMX, MMXEXT, SSE and SSE2 and this means
that some functions for MMX, MMXEXT and 3dnow are always
overridden by other functions (unless one e.g. explicitly
disables SSE2) for x64. So given that the only systems that
benefit from these functions are truely ancient 32bit x86s
they are removed.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libswresample/x86/audio_convert.asm

@@ -608,15 +608,6 @@ pack_8ch_%2_to_%1_u_int %+ SUFFIX:
 %macro NOP_N 0-6
 %endmacro
 
-INIT_MMX mmx
-CONV int32, int16, u, 2, 1, INT16_TO_INT32_N, NOP_N
-CONV int32, int16, a, 2, 1, INT16_TO_INT32_N, NOP_N
-CONV int16, int32, u, 1, 2, INT32_TO_INT16_N, NOP_N
-CONV int16, int32, a, 1, 2, INT32_TO_INT16_N, NOP_N
-
-PACK_6CH float, float, u, 2, 2, 0, NOP_N, NOP_N
-PACK_6CH float, float, a, 2, 2, 0, NOP_N, NOP_N
-
 INIT_XMM sse
 PACK_6CH float, float, u, 2, 2, 7, NOP_N, NOP_N
 PACK_6CH float, float, a, 2, 2, 7, NOP_N, NOP_N

libswresample/x86/audio_convert_init.c

@@ -26,7 +26,7 @@
 #define PROTO(pre, in, out, cap) void ff ## pre ## in## _to_ ##out## _a_ ##cap(uint8_t **dst, const uint8_t **src, int len);
 #define PROTO2(pre, out, cap) PROTO(pre, int16, out, cap) PROTO(pre, int32, out, cap) PROTO(pre, float, out, cap)
 #define PROTO3(pre, cap) PROTO2(pre, int16, cap) PROTO2(pre, int32, cap) PROTO2(pre, float, cap)
-#define PROTO4(pre) PROTO3(pre, mmx) PROTO3(pre, sse) PROTO3(pre, sse2) PROTO3(pre, ssse3) PROTO3(pre, sse4) PROTO3(pre, avx) PROTO3(pre, avx2)
+#define PROTO4(pre) PROTO3(pre, sse) PROTO3(pre, sse2) PROTO3(pre, ssse3) PROTO3(pre, sse4) PROTO3(pre, avx) PROTO3(pre, avx2)
 PROTO4(_)
 PROTO4(_pack_2ch_)
 PROTO4(_pack_6ch_)
@@ -52,15 +52,8 @@ av_cold void swri_audio_convert_init_x86(struct AudioConvert *ac,
             ac->simd_f =  ff_int32_to_int16_a_ ## cap;\
     }
 
-MULTI_CAPS_FUNC(MMX, mmx)
 MULTI_CAPS_FUNC(SSE2, sse2)
 
-    if(EXTERNAL_MMX(mm_flags)) {
-        if(channels == 6) {
-            if(   out_fmt == AV_SAMPLE_FMT_FLT  && in_fmt == AV_SAMPLE_FMT_FLTP || out_fmt == AV_SAMPLE_FMT_S32 && in_fmt == AV_SAMPLE_FMT_S32P)
-                ac->simd_f =  ff_pack_6ch_float_to_float_a_mmx;
-        }
-    }
     if(EXTERNAL_SSE(mm_flags)) {
         if(channels == 6) {
             if(   out_fmt == AV_SAMPLE_FMT_FLT  && in_fmt == AV_SAMPLE_FMT_FLTP || out_fmt == AV_SAMPLE_FMT_S32 && in_fmt == AV_SAMPLE_FMT_S32P)