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VPX: refactor vpx_idct16x16_1_add_sse2()

Change-Id: I431ea0d9abe764d110a1ba32a8cb15e2fdac8805

--- a/vpx_dsp/x86/inv_txfm_sse2.c

+++ b/vpx_dsp/x86/inv_txfm_sse2.c

@@ -1311,24 +1311,10 @@

   dc_value = _mm_set1_epi16(a);

-  for (i = 0; i < 2; ++i) {

-    RECON_AND_STORE(dest +  0 * stride, dc_value);

-    RECON_AND_STORE(dest +  1 * stride, dc_value);

-    RECON_AND_STORE(dest +  2 * stride, dc_value);

-    RECON_AND_STORE(dest +  3 * stride, dc_value);

-    RECON_AND_STORE(dest +  4 * stride, dc_value);

-    RECON_AND_STORE(dest +  5 * stride, dc_value);

-    RECON_AND_STORE(dest +  6 * stride, dc_value);

-    RECON_AND_STORE(dest +  7 * stride, dc_value);

-    RECON_AND_STORE(dest +  8 * stride, dc_value);

-    RECON_AND_STORE(dest +  9 * stride, dc_value);

-    RECON_AND_STORE(dest + 10 * stride, dc_value);

-    RECON_AND_STORE(dest + 11 * stride, dc_value);

-    RECON_AND_STORE(dest + 12 * stride, dc_value);

-    RECON_AND_STORE(dest + 13 * stride, dc_value);

-    RECON_AND_STORE(dest + 14 * stride, dc_value);

-    RECON_AND_STORE(dest + 15 * stride, dc_value);

-    dest += 8;

+  for (i = 0; i < 16; ++i) {

+    RECON_AND_STORE(dest +  0, dc_value);

+    RECON_AND_STORE(dest +  8, dc_value);

+    dest += stride;

   }

 }