net: boost AES-GCM ciphers if the machine has AES-NI.

base/cpu.cc

 // Copyright (c) 2012 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.
 
 #include "base/cpu.h"
 
 #include <string.h>
 
 #include <algorithm>
 
@@ skipping 19 matching lines @@
     ext_family_(0),
     has_mmx_(false),
     has_sse_(false),
     has_sse2_(false),
     has_sse3_(false),
     has_ssse3_(false),
     has_sse41_(false),
     has_sse42_(false),
     has_avx_(false),
     has_avx_hardware_(false),
+    has_aesni_(false),
     has_non_stop_time_stamp_counter_(false),
     cpu_vendor_("unknown") {
   Initialize();
 }
 
 namespace {
 
 #if defined(ARCH_CPU_X86_FAMILY)
 #ifndef _MSC_VER
 
@@ skipping 74 matching lines @@
                  (cpu_info[2] & 0x10000000) != 0;
     // AVX instructions will generate an illegal instruction exception unless
     //   a) they are supported by the CPU,
     //   b) XSAVE is supported by the CPU and
     //   c) XSAVE is enabled by the kernel.
     // See http://software.intel.com/en-us/blogs/2011/04/14/is-avx-enabled
     has_avx_ =
         has_avx_hardware_ &&
         (cpu_info[2] & 0x08000000) != 0 /* OSXSAVE */ &&
         (_xgetbv(0) & 6) == 6 /* XSAVE enabled by kernel */;
+    has_aesni_ = (cpu_info[2] & 0x02000000) != 0;
   }
 
   // Get the brand string of the cpu.
   __cpuid(cpu_info, 0x80000000);
   const int parameter_end = 0x80000004;
   int max_parameter = cpu_info[0];
 
   if (cpu_info[0] >= parameter_end) {
     char* cpu_string_ptr = cpu_string;
 
@@ skipping 26 matching lines @@
   if (has_sse42()) return SSE42;
   if (has_sse41()) return SSE41;
   if (has_ssse3()) return SSSE3;
   if (has_sse3()) return SSE3;
   if (has_sse2()) return SSE2;
   if (has_sse()) return SSE;
   return PENTIUM;
 }
 
 }  // namespace base