x86: vc1: drop MMX loop filter implementation, which uses MMX2 instructions.

libavcodec/x86/vc1dsp_mmx.c

@@ -701,7 +701,6 @@ static void vc1_h_loop_filter16_ ## EXT(uint8_t *src, int stride, int pq) \
 }
 
 #if HAVE_YASM
-LOOP_FILTER(mmx)
 LOOP_FILTER(mmx2)
 LOOP_FILTER(sse2)
 LOOP_FILTER(ssse3)
@@ -790,7 +789,6 @@ void ff_vc1dsp_init_mmx(VC1DSPContext *dsp)
 
 #if HAVE_YASM
     if (mm_flags & AV_CPU_FLAG_MMX) {
-        ASSIGN_LF(mmx);
         dsp->put_no_rnd_vc1_chroma_pixels_tab[0]= ff_put_vc1_chroma_mc8_mmx_nornd;
     }
     return;

libavcodec/x86/vc1dsp_yasm.asm

@@ -227,13 +227,6 @@ section .text
     imul r2, 0x01010101
 %endmacro
 
-; I do not know why the sign extension is needed...
-%macro PSIGNW_SRA_MMX 2
-    psraw %2, 15
-    PSIGNW_MMX %1, %2
-%endmacro
-
-
 %macro VC1_LF_MMX 1
 INIT_MMX
 cglobal vc1_v_loop_filter_internal_%1
@@ -274,10 +267,6 @@ cglobal vc1_h_loop_filter8_%1, 3,5,0
     RET
 %endmacro
 
-%define PABSW PABSW_MMX
-%define PSIGNW PSIGNW_SRA_MMX
-VC1_LF_MMX mmx
-
 %define PABSW PABSW_MMX2
 VC1_LF_MMX mmx2