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

base/cpu.cc

Index: base/cpu.cc
diff --git a/base/cpu.cc b/base/cpu.cc
index dec98bd7a1e82b5e8162a163200de415a513dfde..3f704e3c41de6d83348af609a0aec487da2dc928 100644
--- a/base/cpu.cc
+++ b/base/cpu.cc
@@ -38,6 +38,7 @@ CPU::CPU()
     has_avx_(false),
     has_avx_hardware_(false),
     has_non_stop_time_stamp_counter_(false),
+    has_aesni_(false),

[wtc, 2013/11/27 18:01:51]

Nit: move this member initializer up.

[agl, 2013/11/27 20:50:57]

Done.

     cpu_vendor_("unknown") {
   Initialize();
 }
@@ -120,6 +121,7 @@ void CPU::Initialize() {
     has_ssse3_ = (cpu_info[2] & 0x00000200) != 0;
     has_sse41_ = (cpu_info[2] & 0x00080000) != 0;
     has_sse42_ = (cpu_info[2] & 0x00100000) != 0;
+    has_aesni_ = (cpu_info[2] & 0x02000000) != 0;

[wtc, 2013/11/27 18:01:51]

Nit: this should ideally be set after the has_avx_ member is set.

[agl, 2013/11/27 20:50:57]

Done.

     has_avx_hardware_ =
                  (cpu_info[2] & 0x10000000) != 0;
     // AVX instructions will generate an illegal instruction exception unless