vp9/x86: rename ff_avg[48]_sse to ff_avg[48]_mmxext

pavgb is an sse integer instruction, so the mmxext flag is enough
Signed-off-by: James Almer <jamrial@gmail.com>
Reviewed-by: "Ronald S. Bultje" <rsbultje@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/x86/vp9dsp_init.c

@@ -38,8 +38,8 @@ fpel_func(put,  8, mmx);
 fpel_func(put, 16, sse);
 fpel_func(put, 32, sse);
 fpel_func(put, 64, sse);
-fpel_func(avg,  4, sse);
-fpel_func(avg,  8, sse);
+fpel_func(avg,  4, mmxext);
+fpel_func(avg,  8, mmxext);
 fpel_func(avg, 16, sse2);
 fpel_func(avg, 32, sse2);
 fpel_func(avg, 64, sse2);
@@ -225,12 +225,15 @@ av_cold void ff_vp9dsp_init_x86(VP9DSPContext *dsp)
         init_fpel(3, 0,  8, put, mmx);
     }
 
+    if (EXTERNAL_MMXEXT(cpu_flags)) {
+        init_fpel(4, 1,  4, avg, mmxext);
+        init_fpel(3, 1,  8, avg, mmxext);
+    }
+
     if (EXTERNAL_SSE(cpu_flags)) {
         init_fpel(2, 0, 16, put, sse);
         init_fpel(1, 0, 32, put, sse);
         init_fpel(0, 0, 64, put, sse);
-        init_fpel(4, 1,  4, avg, sse);
-        init_fpel(3, 1,  8, avg, sse);
     }
 
     if (EXTERNAL_SSE2(cpu_flags)) {

libavcodec/x86/vp9mc.asm

@@ -381,7 +381,7 @@ cglobal %1%2, 5, 5, 4, dst, dstride, src, sstride, h
 INIT_MMX mmx
 fpel_fn put, 4,  strideq, strideq*2, stride3q, 4
 fpel_fn put, 8,  strideq, strideq*2, stride3q, 4
-INIT_MMX sse
+INIT_MMX mmxext
 fpel_fn avg, 4,  strideq, strideq*2, stride3q, 4
 fpel_fn avg, 8,  strideq, strideq*2, stride3q, 4
 INIT_XMM sse