avcodec/huffyuvdsp : add add_int16 AVX2 func

libavcodec/x86/huffyuvdsp.asm

@@ -53,6 +53,11 @@ ADD_INT16
 INIT_XMM sse2
 ADD_INT16
 
+%if HAVE_AVX2_EXTERNAL
+INIT_YMM avx2
+ADD_INT16
+%endif
+
 ; void add_hfyu_left_pred_bgr32(uint8_t *dst, const uint8_t *src,
 ;                               intptr_t w, uint8_t *left)
 %macro LEFT_BGR32 0

libavcodec/x86/huffyuvdsp_init.c

@@ -28,6 +28,7 @@
 
 void ff_add_int16_mmx(uint16_t *dst, const uint16_t *src, unsigned mask, int w);
 void ff_add_int16_sse2(uint16_t *dst, const uint16_t *src, unsigned mask, int w);
+void ff_add_int16_avx2(uint16_t *dst, const uint16_t *src, unsigned mask, int w);
 
 void ff_add_hfyu_left_pred_bgr32_mmx(uint8_t *dst, const uint8_t *src,
                                      intptr_t w, uint8_t *left);
@@ -53,4 +54,8 @@ av_cold void ff_huffyuvdsp_init_x86(HuffYUVDSPContext *c, enum AVPixelFormat pix
         c->add_int16 = ff_add_int16_sse2;
         c->add_hfyu_left_pred_bgr32 = ff_add_hfyu_left_pred_bgr32_sse2;
     }
+
+    if (EXTERNAL_AVX2_FAST(cpu_flags)) {
+        c->add_int16 = ff_add_int16_avx2;
+    }
 }

libavcodec/x86/huffyuvdsp_template.asm

@@ -21,8 +21,8 @@
 ;******************************************************************************
 
 %macro INT16_LOOP 2 ; %1 = a/u (aligned/unaligned), %2 = add/sub
-    movd    m4, maskd
-    SPLATW  m4, m4
+    movd    xm4, maskd
+    SPLATW  m4, xm4
     add     wd, wd
     test    wq, 2*mmsize - 1
     jz %%.tomainloop