Add MIPS SIMD Arch (MSA) build flags for GYP/GN builds

A preparation patch for adding MSA optimizations in libYUV project.

Review-Url: https://codereview.chromium.org/2150943003
Cr-Original-Commit-Position: refs/heads/master@{#413302}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 953e9fa0192b566ce280d895cbc3db2924c7e239

common.gypi

@@ -217,6 +217,9 @@
         #   2: revision 2
         'mips_dsp_rev%': 0,
 
+        # MIPS SIMD Arch compilation flag.
+        'mips_msa%': 1,
+
         'conditions': [
           ['branding == "Chrome"', {
             'branding_path_component%': 'google_chrome',
@@ -340,6 +343,7 @@
       'target_subarch%': '<(target_subarch)',
       'mips_arch_variant%': '<(mips_arch_variant)',
       'mips_dsp_rev%': '<(mips_dsp_rev)',
+      'mips_msa%': '<(mips_msa)',
       'toolkit_views%': '<(toolkit_views)',
       'desktop_linux%': '<(desktop_linux)',
       'use_aura%': '<(use_aura)',
@@ -1120,6 +1124,7 @@
     'target_subarch%': '<(target_subarch)',
     'mips_arch_variant%': '<(mips_arch_variant)',
     'mips_dsp_rev%': '<(mips_dsp_rev)',
+    'mips_msa%': '<(mips_msa)',
     'host_arch%': '<(host_arch)',
     'toolkit_views%': '<(toolkit_views)',
     'ui_compositor_image_transport%': '<(ui_compositor_image_transport)',
@@ -4119,6 +4124,9 @@
                       ['clang==0 and OS=="android"', {
                         'ldflags': ['-mips32r6', '-Wl,-melf32ltsmip',],
                       }],
+                      ['mips_msa==1', {
+                        'cflags': ['-mmsa', '-mfp64', '-msched-weight', '-mload-store-pairs'],
+                      }],
                     ],
                     'cflags': [ '-mfp64', '-mno-odd-spreg' ],
                     'ldflags': [ '-mfp64', '-mno-odd-spreg' ],
@@ -4225,6 +4233,9 @@
                         'cflags': ['-mips64r6', '-Wa,-mips64r6'],
                         'ldflags': ['-mips64r6'],
                       }],
+                      ['mips_msa==1', {
+                        'cflags': ['-mmsa', '-mfp64', '-msched-weight', '-mload-store-pairs'],
+                      }],
                     ],
                   }],
                   ['mips_arch_variant=="r2"', {

config/compiler/BUILD.gn

@@ -561,6 +561,14 @@ config("compiler_cpu_abi") {
             ]
           }
         }
+        if (mips_use_msa == true) {
+          cflags += [
+            "-mmsa",
+            "-mfp64",
+            "-msched-weight",
+            "-mload-store-pairs",
+          ]
+        }
       } else if (mips_arch_variant == "r2") {
         if (is_clang) {
           if (is_android) {
@@ -637,6 +645,14 @@ config("compiler_cpu_abi") {
           ]
           ldflags += [ "-mips64r6" ]
         }
+        if (mips_use_msa == true) {
+          cflags += [
+            "-mmsa",
+            "-mfp64",
+            "-msched-weight",
+            "-mload-store-pairs",
+          ]
+        }
       } else if (mips_arch_variant == "r2") {
         cflags += [
           "-mips64r2",

config/mips.gni

@@ -22,6 +22,9 @@ if (current_cpu == "mipsel" || v8_current_cpu == "mipsel") {
     #   2: revision 2
     mips_dsp_rev = 0
 
+    # MIPS SIMD Arch compilation flag.
+    mips_use_msa = true
+
     # MIPS floating-point ABI. Possible values are:
     #   "hard": sets the GCC -mhard-float option.
     #   "soft": sets the GCC -msoft-float option.
@@ -40,6 +43,9 @@ if (current_cpu == "mipsel" || v8_current_cpu == "mipsel") {
   if (current_os == "android" || target_os == "android") {
     declare_args() {
       mips_arch_variant = "r6"
+
+      # MIPS SIMD Arch compilation flag.
+      mips_use_msa = true
     }
   } else {
     declare_args() {