Add MIPS SIMD Arch (MSA) optimized MirrorRow function

source/planar_functions.cc

 /*
  *  Copyright 2011 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 384 matching lines @@
   }
 #endif
 // TODO(fbarchard): Mirror on mips handle unaligned memory.
 #if defined(HAS_MIRRORROW_DSPR2)
   if (TestCpuFlag(kCpuHasDSPR2) &&
       IS_ALIGNED(src_y, 4) && IS_ALIGNED(src_stride_y, 4) &&
       IS_ALIGNED(dst_y, 4) && IS_ALIGNED(dst_stride_y, 4)) {
     MirrorRow = MirrorRow_DSPR2;
   }
 #endif
+#if defined(HAS_MIRRORROW_MSA)
+  if (TestCpuFlag(kCpuHasMSA)) {
+    MirrorRow = MirrorRow_Any_MSA;
+    if (IS_ALIGNED(width, 64)) {
+      MirrorRow = MirrorRow_MSA;
+    }
+}
+#endif
 
   // Mirror plane
   for (y = 0; y < height; ++y) {
     MirrorRow(src_y, dst_y, width);
     src_y += src_stride_y;
     dst_y += dst_stride_y;
   }
 }
 
 // Convert YUY2 to I422.
@@ skipping 2387 matching lines @@
     }
     free_aligned_buffer_64(rows);
   }
   return 0;
 }
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif