Add MIPS SIMD Arch (MSA) optimized MirrorRow function

docs/getting_started.md

Index: docs/getting_started.md
diff --git a/docs/getting_started.md b/docs/getting_started.md
index 939f08f02bcff370e85b884c6c2825a22442849f..6dd04784de5722d233acf5230b0f1cbbc3a3d2b0 100644
--- a/docs/getting_started.md
+++ b/docs/getting_started.md
@@ -160,7 +160,13 @@ ia32
 
 mipsel
 
-    GYP_DEFINES="OS=android target_arch=mipsel" GYP_CROSSCOMPILE=1 ./gyp_libyuv
+    GYP_DEFINES="OS=android target_arch=mipsel mips_msa=0" GYP_CROSSCOMPILE=1 ./gyp_libyuv
+    ninja -j7 -C out/Debug yuv_unittest_apk
+    ninja -j7 -C out/Release yuv_unittest_apk
+
+mips64el
+
+    GYP_DEFINES="OS=android target_arch=mips64el mips_msa=0" GYP_CROSSCOMPILE=1 ./gyp_libyuv

[fbarchard1, 2016/09/14 01:48:04]

good, but caveat that we're migrating from GYP to GN
 

[manojkumar.bhosale, 2016/09/14 12:45:29]

OK. Reverting this change

     ninja -j7 -C out/Debug yuv_unittest_apk
     ninja -j7 -C out/Release yuv_unittest_apk
 
@@ -196,6 +202,17 @@ Running test with C code:
     gn gen out/Official "--args=is_debug=false is_official_build=true is_chrome_branded=true"
     ninja -C out/Official
 
+#### Building mips with GN
+
+mipsel
+    gn gen out/Default "--args=is_debug=false target_cpu=\"mipsel\" target_os = \"android\" mips_arch_variant = \"r6\" mips_use_msa = true is_component_build = true is_clang = false"
+    ninja -C out/Default
+
+mips64el
+    gn gen out/Default "--args=is_debug=false target_cpu=\"mips64el\" target_os = \"android\" mips_arch_variant = \"r6\" mips_use_msa = true is_component_build = true is_clang = false"
+    ninja -C out/Default
+
+
 ### Linux
 
     GYP_DEFINES="target_arch=x64" ./gyp_libyuv