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.
+// Copyright (c) 2006-2011 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"
+
+#if defined(ARCH_CPU_X86_FAMILY)
+#if defined(_MSC_VER)
 #include <intrin.h>
-#include <string>
+#endif
+#endif
+
+#include <string.h>
 
 namespace base {
 
 CPU::CPU()
   : type_(0),
     family_(0),
     model_(0),
     stepping_(0),
     ext_model_(0),
     ext_family_(0),
+    has_mmx_(false),
+    has_sse_(false),
+    has_sse2_(false),
+    has_sse3_(false),
+    has_ssse3_(false),
+    has_sse4_(false),
     cpu_vendor_("unknown") {
   Initialize();
 }
 
+#if defined(ARCH_CPU_X86_FAMILY)
+#ifndef _MSC_VER
+
+#if defined(__pic__) && defined(__i386__)
+
+void __cpuid(int cpu_info[4], int info_type) {
+  __asm__ volatile (
+    "mov %%ebx, %%edi\n"
+    "cpuid\n"
+    "xchg %%edi, %%ebx\n"
+    : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
+    : "a"(info_type)
+  );
+}
+
+void __cpuidex(int cpu_info[4], int info_type, int info_index) {
+  __asm__ volatile (
+    "mov %%ebx, %%edi\n"
+    "cpuid\n"
+    "xchg %%edi, %%ebx\n"
+    : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
+    : "a"(info_type), "c"(info_index)
+  );
+}
+
+#else
+
+void __cpuid(int cpu_info[4], int info_type) {
+  __asm__ volatile (
+    "cpuid \n\t"
+    : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
+    : "a"(info_type)
+  );
+}
+
+void __cpuidex(int cpu_info[4], int info_type, int info_index) {
+  __asm__ volatile (
+    "cpuid \n\t"
+    : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
+    : "a"(info_type), "c"(info_index)
+  );
+}
+
+#endif
+#endif  // _MSC_VER
+#endif  // ARCH_CPU_X86_FAMILY
+
 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);
   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);
     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_mmx_ = (cpu_info[3] & 0x00800000) != 0;
+    has_sse_ = (cpu_info[3] & 0x02000000) != 0;
+    has_sse2_ = (cpu_info[3] & 0x04000000) != 0;
+    has_sse3_ = (cpu_info[2] & 0x00000001) != 0;
+    has_ssse3_ = (cpu_info[2] & 0x00000200) != 0;
+    has_sse4_ = (cpu_info[2] & 0x00080000) != 0;

[fbarchard, 2011/02/16 00:30:15]

I think you mean sse41 ?  should probably be explicit.

   }
+#endif
 }
 
+
+
 }  // namespace base