HalfFloat neon armv7 fix for destination pointer.

source/row_neon64.cc

 /*
  *  Copyright 2014 The LibYuv Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS. All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 2693 matching lines @@
   : "+r"(src_y0),      // %0
     "+r"(src_y1),      // %1
     "+r"(dst_sobely),  // %2
     "+r"(width)        // %3
   : "r"(1LL),          // %4
     "r"(6LL)           // %5
   : "cc", "memory", "v0", "v1", "v2", "v3"  // Clobber List
   );
 }
 
+// Caveat - rounds float to half float whereas scaling version truncates.
 void HalfFloat1Row_NEON(const uint16* src, uint16* dst, float, int width) {
   asm volatile (
   "1:                                          \n"
     MEMACCESS(0)
     "ld1        {v1.16b}, [%0], #16            \n"  // load 8 shorts
     "subs       %w2, %w2, #8                   \n"  // 8 pixels per loop
     "uxtl       v2.4s, v1.4h                   \n"  // 8 int's
     "uxtl2      v3.4s, v1.8h                   \n"
     "scvtf      v2.4s, v2.4s                   \n"  // 8 floats
     "scvtf      v3.4s, v3.4s                   \n"
-    "fcvtn      v1.4h, v2.4s                   \n"  // 8 floatsgit
+    "fcvtn      v1.4h, v2.4s                   \n"  // 8 half floats
     "fcvtn2     v1.8h, v3.4s                   \n"
    MEMACCESS(1)
     "st1        {v1.16b}, [%1], #16            \n"  // store 8 shorts
     "b.gt       1b                             \n"
   : "+r"(src),    // %0
     "+r"(dst),    // %1
     "+r"(width)   // %2
   :
   : "cc", "memory", "v1", "v2", "v3"
   );
@@ skipping 23 matching lines @@
   : "cc", "memory", "v1", "v2", "v3"
   );
 }
 
 #endif  // !defined(LIBYUV_DISABLE_NEON) && defined(__aarch64__)
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif