Integrate SIMD optimisations for zlib

third_party/zlib/BUILD.gn

 # Copyright (c) 2013 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.
 
 config("zlib_config") {
   include_dirs = [ "." ]
+  if (cpu_arch == "x86" || cpu_arch == "x64") {
+    defines = [ "ZLIB_X86_SIMD" ]

[agl, 2014/10/17 00:45:34]

ditto about not adding a #define.

[robert.bradford, 2014/10/20 16:45:54]

Acknowledged.

+  }
+}
+
+static_library("zlib_x86_simd") {
+  if (cpu_arch == "x86" || cpu_arch == "x64") {
+    sources = [ "crc_folding.c", "fill_window_sse.c" ]
+    cflags = [ "-msse2", "-msse4.2", "-mpclmul" ]
+  } else {
+    sources = [ "simd_stub.c"]
+  }
 }
 
 static_library("zlib") {
   if (!is_win) {
     # Don't stomp on "libzlib" on other platforms.
     output_name = "chrome_zlib"
   }
 
   sources = [
     "adler32.c",
@@ skipping 12 matching lines @@
     "inffast.h",
     "inffixed.h",
     "inflate.c",
     "inflate.h",
     "inftrees.c",
     "inftrees.h",
     "mozzconf.h",
     "trees.c",
     "trees.h",
     "uncompr.c",
+    "x86.h",
     "zconf.h",
     "zlib.h",
     "zutil.c",
     "zutil.h",
   ]
 
+  if (cpu_arch == "x86" || cpu_arch == "x64") {
+    sources += [ "x86.c" ]
+  }
+
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
 
   public_configs = [ ":zlib_config" ]
+  deps = [ ":zlib_x86_simd" ]
 }
 
 static_library("minizip") {
   sources = [
     "contrib/minizip/ioapi.c",
     "contrib/minizip/ioapi.h",
     "contrib/minizip/iowin32.c",
     "contrib/minizip/iowin32.h",
     "contrib/minizip/unzip.c",
     "contrib/minizip/unzip.h",
@@ skipping 32 matching lines @@
     "google/zip_internal.cc",
     "google/zip_internal.h",
     "google/zip_reader.cc",
     "google/zip_reader.h",
   ]
   deps = [
     ":minizip",
     "//base",
   ]
 }