Adds AVX detection to CPU and records a histogram of Intel uArch Support

base/cpu.cc

Index: base/cpu.cc
diff --git a/base/cpu.cc b/base/cpu.cc
index cf4f2f1e496346c7ceea9dfcbe46d36f8cc4e48e..d6976bab33b316aed50e3a133edf1a7e8a060a97 100644
--- a/base/cpu.cc
+++ b/base/cpu.cc
@@ -117,6 +117,7 @@ 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_avx_ = (cpu_info[2] & 0x10000000) != 0;
   }
 
   // Get the brand string of the cpu.
@@ -137,4 +138,15 @@ void CPU::Initialize() {
 #endif
 }
 
+CPU::IntelMicroArchitecture CPU::GetIntelMicroArchitecture() const {
+  if (has_avx()) return AVX;
+  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