avcodec/vp8dsp: use AV_ZERO64 to clear idct coefficient rows

Signed-off-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/vp8dsp.c

@@ -68,10 +68,7 @@ static void vp7_luma_dc_wht_c(int16_t block[4][4][16], int16_t dc[16])
         b1 = (tmp[i + 0] - tmp[i + 8]) * 23170;
         c1 = tmp[i + 4] * 12540 - tmp[i + 12] * 30274;
         d1 = tmp[i + 4] * 30274 + tmp[i + 12] * 12540;
-        dc[i*4+0] = 0;
-        dc[i*4+1] = 0;
-        dc[i*4+2] = 0;
-        dc[i*4+3] = 0;
+        AV_ZERO64(dc + i*4);
         block[0][i][0] = (a1 + d1 + 0x20000) >> 18;
         block[3][i][0] = (a1 - d1 + 0x20000) >> 18;
         block[1][i][0] = (b1 + c1 + 0x20000) >> 18;
@@ -102,10 +99,7 @@ static void vp7_idct_add_c(uint8_t *dst, int16_t block[16], ptrdiff_t stride)
         b1 = (block[i*4+0] - block[i*4+2]) * 23170;
         c1 = block[i*4+1] * 12540 - block[i*4+3] * 30274;
         d1 = block[i*4+1] * 30274 + block[i*4+3] * 12540;
-        block[i*4+0] = 0;
-        block[i*4+1] = 0;
-        block[i*4+2] = 0;
-        block[i*4+3] = 0;
+        AV_ZERO64(block + i*4);
         tmp[i*4+0] = (a1 + d1) >> 14;
         tmp[i*4+3] = (a1 - d1) >> 14;
         tmp[i*4+1] = (b1 + c1) >> 14;
@@ -164,10 +158,7 @@ static void vp8_luma_dc_wht_c(int16_t block[4][4][16], int16_t dc[16])
         t1 = dc[i*4+1] + dc[i*4+2];
         t2 = dc[i*4+1] - dc[i*4+2];
         t3 = dc[i*4+0] - dc[i*4+3] + 3; // rounding
-        dc[i*4+0] = 0;
-        dc[i*4+1] = 0;
-        dc[i*4+2] = 0;
-        dc[i*4+3] = 0;
+        AV_ZERO64(dc + i*4);
 
         block[i][0][0] = (t0 + t1) >> 3;
         block[i][1][0] = (t3 + t2) >> 3;