[x265] [PATCH] sse.inc: Modified sse_ss16 intrinsic function. Removed redundancy using comman macro PROCESS_SSE_SS4x1

[dnyaneshwar at multicorewareinc.com]

# HG changeset patch
# User Dnyaneshwar Gorade <dnyaneshwar at multicorewareinc.com>
# Date 1381324893 -19800
#      Wed Oct 09 18:51:33 2013 +0530
# Node ID 07f09a9a2d63d6c179522fd1e586d4b83f942e2f
# Parent  af969bb7e0fede8239734e483aa7e3ccc6a817aa
sse.inc: Modified sse_ss16 intrinsic function. Removed redundancy using comman macro PROCESS_SSE_SS4x1.

diff -r af969bb7e0fe -r 07f09a9a2d63 source/common/vec/sse.inc
--- a/source/common/vec/sse.inc	Wed Oct 09 18:46:12 2013 +0530
+++ b/source/common/vec/sse.inc	Wed Oct 09 18:51:33 2013 +0530
@@ -132,35 +132,26 @@
 int sse_ss16(short* fenc, intptr_t strideFenc, short* fref, intptr_t strideFref)
 {
     int rows = ly;
+    __m128i sum  = _mm_setzero_si128();
+    __m128i m1, n1, diff, sign1, sign2, tmp1, tmp2;
 
-    Vec4i diff(0);
-    Vec8s m1, n1;
-    Vec4i sum(0);
     for (; rows != 0; rows--)
     {
-        m1.load(fenc);
-        n1.load(fref);
-        diff = extend_low(m1) - extend_low(n1);
-        diff = diff * diff;
-        sum += diff;
-        diff = extend_high(m1) - extend_high(n1);
-        diff = diff * diff;
-        sum += diff;
+        for(int i = 0; i < 16; i += 8)
+        {
+            PROCESS_SSE_SS4x1(i);
 
-        m1.load(fenc + 8);
-        n1.load(fref + 8);
-        diff = extend_low(m1) - extend_low(n1);
-        diff = diff * diff;
-        sum += diff;
-        diff = extend_high(m1) - extend_high(n1);
-        diff = diff * diff;
-        sum += diff;
-
+            m1 = _mm_unpackhi_epi16(m1, sign1);
+            n1 = _mm_unpackhi_epi16(n1, sign2);
+            diff = _mm_sub_epi32(m1, n1);
+            diff = _mm_mullo_epi32(diff, diff);
+            sum = _mm_add_epi32(sum, diff);
+        }
         fenc += strideFenc;
         fref += strideFref;
     }
-
-    return horizontal_add(sum);
+    __m128i sum1  = _mm_hadd_epi32(sum, sum);
+    return _mm_cvtsi128_si32(_mm_hadd_epi32(sum1, sum1));
 }
 
 template<int ly>