Minor sk_memset{16|32}_SSE2 optimization.

src/opts/SkUtils_opts_SSE2.cpp

 
 /*
  * Copyright 2009 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include <emmintrin.h>
 #include "SkUtils_opts_SSE2.h"
 
 void sk_memset16_SSE2(uint16_t *dst, uint16_t value, int count)
 {
     SkASSERT(dst != NULL && count >= 0);
 
     // dst must be 2-byte aligned.
     SkASSERT((((size_t) dst) & 0x01) == 0);
 
     if (count >= 32) {
         while (((size_t)dst) & 0x0F) {
             *dst++ = value;
             --count;
         }
         __m128i *d = reinterpret_cast<__m128i*>(dst);
         __m128i value_wide = _mm_set1_epi16(value);
         while (count >= 32) {
-            _mm_store_si128(d++, value_wide);
-            _mm_store_si128(d++, value_wide);
-            _mm_store_si128(d++, value_wide);
-            _mm_store_si128(d++, value_wide);
+            _mm_store_si128(d    , value_wide);
+            _mm_store_si128(d + 1, value_wide);
+            _mm_store_si128(d + 2, value_wide);
+            _mm_store_si128(d + 3, value_wide);
+            d += 4;
             count -= 32;
         }
         dst = reinterpret_cast<uint16_t*>(d);
     }
     while (count > 0) {
         *dst++ = value;
         --count;
     }
 }
 
 void sk_memset32_SSE2(uint32_t *dst, uint32_t value, int count)
 {
     SkASSERT(dst != NULL && count >= 0);
 
     // dst must be 4-byte aligned.
     SkASSERT((((size_t) dst) & 0x03) == 0);
 
     if (count >= 16) {
         while (((size_t)dst) & 0x0F) {
             *dst++ = value;
             --count;
         }
         __m128i *d = reinterpret_cast<__m128i*>(dst);
         __m128i value_wide = _mm_set1_epi32(value);
         while (count >= 16) {
-            _mm_store_si128(d++, value_wide);
-            _mm_store_si128(d++, value_wide);
-            _mm_store_si128(d++, value_wide);
-            _mm_store_si128(d++, value_wide);
+            _mm_store_si128(d    , value_wide);
+            _mm_store_si128(d + 1, value_wide);
+            _mm_store_si128(d + 2, value_wide);
+            _mm_store_si128(d + 3, value_wide);
+            d += 4;
             count -= 16;
         }
         dst = reinterpret_cast<uint32_t*>(d);
     }
     while (count > 0) {
         *dst++ = value;
         --count;
     }
 }