Use the cpuid instruction to generate the CPU brand string. And

base/cpu.cc

Index: base/cpu.cc
===================================================================
--- base/cpu.cc	(revision 159378)
+++ base/cpu.cc	(working copy)
@@ -85,6 +85,7 @@
 #if defined(ARCH_CPU_X86_FAMILY)
   int cpu_info[4] = {-1};
   char cpu_string[0x20];
+  char cpu_brand[0x30];
 
   // __cpuid with an InfoType argument of 0 returns the number of
   // valid Ids in CPUInfo[0] and the CPU identification string in
@@ -118,6 +119,23 @@
     has_ssse3_ = (cpu_info[2] & 0x00000200) != 0;
     has_sse41_ = (cpu_info[2] & 0x00080000) != 0;
     has_sse42_ = (cpu_info[2] & 0x00100000) != 0;
+
+    // get the brand string of the cpu.
+    __cpuid(cpu_info, 0x80000000);
+
+    if (cpu_info[0] >= 0x80000004) {
+      memset(cpu_brand, 0, sizeof(cpu_brand));
+      int start_flag = 0x80000002;
+
+      for (int index = 0; index < 3; index++) {
+        __cpuid(cpu_info, start_flag + index);
+        *(reinterpret_cast<int*>(cpu_brand + index*16)) = cpu_info[0];
+        *(reinterpret_cast<int*>(cpu_brand + index*16 + 4)) = cpu_info[1];
+        *(reinterpret_cast<int*>(cpu_brand + index*16 + 8)) = cpu_info[2];
+        *(reinterpret_cast<int*>(cpu_brand + index*16 + 12)) = cpu_info[3];
+      }
+      cpu_brand_ = cpu_brand;
+    }
   }
 #endif
 }