Add MSA optimized ARGB Multiply/Add/Subtract row functions

source/planar_functions.cc

Index: source/planar_functions.cc
diff --git a/source/planar_functions.cc b/source/planar_functions.cc
index 06ac9e3740dea081bcdb641b74af561e91ca7941..86854ae25dcf045ff509455aea824fd3befbe50f 100644
--- a/source/planar_functions.cc
+++ b/source/planar_functions.cc
@@ -1115,6 +1115,14 @@ int ARGBMultiply(const uint8* src_argb0,
     }
   }
 #endif
+#if defined(HAS_ARGBMULTIPLYROW_MSA)
+  if (TestCpuFlag(kCpuHasMSA)) {
+    ARGBMultiplyRow = ARGBMultiplyRow_Any_MSA;
+    if (IS_ALIGNED(width, 4)) {
+      ARGBMultiplyRow = ARGBMultiplyRow_MSA;
+    }
+  }
+#endif
 
   // Multiply plane
   for (y = 0; y < height; ++y) {
@@ -1184,6 +1192,14 @@ int ARGBAdd(const uint8* src_argb0,
     }
   }
 #endif
+#if defined(HAS_ARGBADDROW_MSA)
+  if (TestCpuFlag(kCpuHasMSA)) {
+    ARGBAddRow = ARGBAddRow_Any_MSA;
+    if (IS_ALIGNED(width, 8)) {
+      ARGBAddRow = ARGBAddRow_MSA;
+    }
+  }
+#endif
 
   // Add plane
   for (y = 0; y < height; ++y) {
@@ -1248,6 +1264,14 @@ int ARGBSubtract(const uint8* src_argb0,
     }
   }
 #endif
+#if defined(HAS_ARGBSUBTRACTROW_MSA)
+  if (TestCpuFlag(kCpuHasMSA)) {
+    ARGBSubtractRow = ARGBSubtractRow_Any_MSA;
+    if (IS_ALIGNED(width, 8)) {
+      ARGBSubtractRow = ARGBSubtractRow_MSA;
+    }
+  }
+#endif
 
   // Subtract plane
   for (y = 0; y < height; ++y) {