libwebp: use -O2 on arm targets

third_party/libwebp/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/arm.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 config("libwebp_config") {
   include_dirs = [ "." ]
 }
 
+set_opt_level =
+    !is_debug && is_posix && (current_cpu == "arm" || current_cpu == "arm64")
+
 use_dsp_neon =
     current_cpu == "arm64" || (current_cpu == "arm" && arm_version >= 7 &&
                                (arm_use_neon || arm_optionally_use_neon))
 
 source_set("libwebp_dec") {
   sources = [
     "dec/alpha.c",
     "dec/buffer.c",
     "dec/frame.c",
     "dec/idec.c",
     "dec/io.c",
     "dec/quant.c",
     "dec/tree.c",
     "dec/vp8.c",
     "dec/vp8l.c",
     "dec/webp.c",
   ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
+  if (set_opt_level) {
+    configs -= [ "//build/config/compiler:default_optimization" ]
+    configs += [ "//build/config/compiler:optimize_max" ]
+  }
 
   deps = [
     ":libwebp_dsp",
     ":libwebp_utils",
   ]
   all_dependent_configs = [ ":libwebp_config" ]
   if (use_dsp_neon) {
     deps += [ ":libwebp_dsp_neon" ]
   }
 }
@@ skipping 39 matching lines @@
     "dsp/rescaler_mips32.c",
     "dsp/rescaler_mips_dsp_r2.c",
     "dsp/upsampling.c",
     "dsp/upsampling_mips_dsp_r2.c",
     "dsp/yuv.c",
     "dsp/yuv_mips32.c",
     "dsp/yuv_mips_dsp_r2.c",
   ]
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
+  if (set_opt_level) {
+    configs -= [ "//build/config/compiler:default_optimization" ]
+    configs += [ "//build/config/compiler:optimize_max" ]
+  }
 
   all_dependent_configs = [ ":libwebp_config" ]
   deps = [
     ":libwebp_dsp_sse2",
     ":libwebp_dsp_sse41",
     ":libwebp_utils",
   ]
   if (is_android) {
     deps += [ "//third_party/android_tools:cpu_features" ]
 
@@ skipping 10 matching lines @@
 
 source_set("libwebp_dsp_sse41") {
   sources = [
     "dsp/alpha_processing_sse41.c",
     "dsp/dec_sse41.c",
     "dsp/enc_sse41.c",
     "dsp/lossless_enc_sse41.c",
   ]
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
+  if (set_opt_level) {
+    configs -= [ "//build/config/compiler:default_optimization" ]
+    configs += [ "//build/config/compiler:optimize_max" ]
+  }
 
   all_dependent_configs = [ ":libwebp_config" ]
   if (!is_msan) {
     if ((current_cpu == "x86" || current_cpu == "x64") &&
         (!is_win || is_clang)) {
       cflags = [ "-msse4.1" ]
     }
   }
 }
 
 source_set("libwebp_dsp_sse2") {
   sources = [
     "dsp/alpha_processing_sse2.c",
     "dsp/argb_sse2.c",
     "dsp/cost_sse2.c",
     "dsp/dec_sse2.c",
     "dsp/enc_sse2.c",
     "dsp/filters_sse2.c",
     "dsp/lossless_enc_sse2.c",
     "dsp/lossless_sse2.c",
     "dsp/rescaler_sse2.c",
     "dsp/upsampling_sse2.c",
     "dsp/yuv_sse2.c",
   ]
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
+  if (set_opt_level) {
+    configs -= [ "//build/config/compiler:default_optimization" ]
+    configs += [ "//build/config/compiler:optimize_max" ]
+  }
 
   all_dependent_configs = [ ":libwebp_config" ]
   if (!is_msan) {
     if ((current_cpu == "x86" || current_cpu == "x64") &&
         (!is_win || is_clang)) {
       cflags = [ "-msse2" ]
     }
   }
 }
 
 if (use_dsp_neon) {
   source_set("libwebp_dsp_neon") {
     sources = [
       "dsp/dec_neon.c",
       "dsp/enc_neon.c",
       "dsp/lossless_enc_neon.c",
       "dsp/lossless_neon.c",
       "dsp/rescaler_neon.c",
       "dsp/upsampling_neon.c",
     ]
 
     include_dirs = [ "." ]
 
+    if (set_opt_level) {
+      configs -= [ "//build/config/compiler:default_optimization" ]
+      configs += [ "//build/config/compiler:optimize_max" ]
+    }
+
     if (current_cpu == "arm") {
       # behavior similar to *.c.neon in an Android.mk
       configs -= [ "//build/config/compiler:compiler_arm_fpu" ]
       cflags = [ "-mfpu=neon" ]
     } else if (current_cpu == "arm64") {
       # avoid an ICE with gcc-4.9: b/15574841
       cflags = [ "-frename-registers" ]
     }
 
     if (is_android) {
@@ skipping 23 matching lines @@
     "enc/picture_tools.c",
     "enc/quant.c",
     "enc/syntax.c",
     "enc/token.c",
     "enc/tree.c",
     "enc/vp8l.c",
     "enc/webpenc.c",
   ]
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
+  if (set_opt_level) {
+    configs -= [ "//build/config/compiler:default_optimization" ]
+    configs += [ "//build/config/compiler:optimize_max" ]
+  }
 
   all_dependent_configs = [ ":libwebp_config" ]
 
   deps = [
     ":libwebp_utils",
   ]
 }
 
 config("libwebp_utils_warnings") {
   if (is_clang) {
@@ skipping 12 matching lines @@
     "utils/huffman_encode.c",
     "utils/quant_levels.c",
     "utils/quant_levels_dec.c",
     "utils/random.c",
     "utils/rescaler.c",
     "utils/thread.c",
     "utils/utils.c",
   ]
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
+  if (set_opt_level) {
+    configs -= [ "//build/config/compiler:default_optimization" ]
+    configs += [ "//build/config/compiler:optimize_max" ]
+  }
 
   all_dependent_configs = [ ":libwebp_config" ]
 
   public_configs = [ ":libwebp_utils_warnings" ]
 }
 
 group("libwebp") {
   deps = [
     ":libwebp_dec",
     ":libwebp_demux",
     ":libwebp_dsp",
     ":libwebp_enc",
     ":libwebp_utils",
   ]
   public_configs = [ ":libwebp_config" ]
   if (use_dsp_neon) {
     deps += [ ":libwebp_dsp_neon" ]
   }
 }