detect cpu feature for all x64 and x86 platforms (no longer windows only).

base/cpu.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.

[fbarchard, 2011/02/15 21:30:11]

(c) 2011

 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/cpu.h"
+
+#if defined(ARCH_CPU_X86_FAMILY)
+#if defined(_MSC_VER)
 #include <intrin.h>
-#include <string>
+#else
+#include <cpuid.h>
+#endif
+#endif
+
+#include <string.h>
 
 namespace base {
 
 CPU::CPU()
   : type_(0),
     family_(0),
     model_(0),
     stepping_(0),
     ext_model_(0),
     ext_family_(0),
+    has_sse2_(false),
     cpu_vendor_("unknown") {
   Initialize();
 }
 
+#if defined(ARCH_CPU_X86_FAMILY)
+static void cpuid(int info[4], int info_type) {
+#if defined( _MSC_VER)
+  __cpuid(info, info_type);
+#else
+  __cpuid(info_type, info[0], info[1], info[2], info[3]);

[fbarchard, 2011/02/15 21:30:11]

perfect :)

+#endif
+}
+#endif
+
 void CPU::Initialize() {
+#if defined(ARCH_CPU_X86_FAMILY)
   int cpu_info[4] = {-1};
   char cpu_string[0x20];
 
   // __cpuid with an InfoType argument of 0 returns the number of
   // valid Ids in CPUInfo[0] and the CPU identification string in
   // the other three array elements. The CPU identification string is
   // not in linear order. The code below arranges the information
   // in a human readable form.
   //
   // More info can be found here:
   // http://msdn.microsoft.com/en-us/library/hskdteyh.aspx
-  __cpuid(cpu_info, 0);
+  cpuid(cpu_info, 0);
   int num_ids = cpu_info[0];
   memset(cpu_string, 0, sizeof(cpu_string));
   *(reinterpret_cast<int*>(cpu_string)) = cpu_info[1];
   *(reinterpret_cast<int*>(cpu_string+4)) = cpu_info[3];
   *(reinterpret_cast<int*>(cpu_string+8)) = cpu_info[2];
 
   // Interpret CPU feature information.
   if (num_ids > 0) {
-    __cpuid(cpu_info, 1);
+    cpuid(cpu_info, 1);
     stepping_ = cpu_info[0] & 0xf;
     model_ = (cpu_info[0] >> 4) & 0xf;
     family_ = (cpu_info[0] >> 8) & 0xf;
     type_ = (cpu_info[0] >> 12) & 0x3;
     ext_model_ = (cpu_info[0] >> 16) & 0xf;
     ext_family_ = (cpu_info[0] >> 20) & 0xff;
     cpu_vendor_ = cpu_string;
+    has_sse2_ = (cpu_info[3] & (1<<26)) != 0;
   }
+#endif
 }
 
+
+
 }  // namespace base