Reverts refactoring of CPU feature detection for

runtime/vm/cpuinfo_win.cc

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-#include "vm/globals.h"
-#if defined(TARGET_OS_WINDOWS)
-
-#include "vm/cpuinfo.h"
-
-// __cpuid()
-#include <intrin.h>  // NOLINT
-#include <string.h>  // NOLINT
-
-#include "platform/assert.h"
-
-namespace dart {
-
-struct CpuIdData {
-  static bool sse2;
-  static bool sse41;
-  static char* id_string;
-  static char* brand_string;
-};
-
-
-char* CpuInfo::data_ = NULL;
-intptr_t CpuInfo::datalen_ = 0;
-bool CpuIdData::sse2 = false;
-bool CpuIdData::sse41 = false;
-char* CpuIdData::id_string = NULL;
-char* CpuIdData::brand_string = NULL;
-
-
-// The documentation for __cpuid is at:
-// http://msdn.microsoft.com/en-us/library/hskdteyh(v=vs.90).aspx
-// InitOnce reads and caches __cpuid results for use by CpuInfo.
-void CpuInfo::InitOnce() {
-  int32_t info[4] = {-1};
-
-  InitializeFields();
-
-  __cpuid(info, 0);
-  char *id_string = new char[3 * sizeof(int32_t)];
-  // Yes, these are supposed to be out of order.
-  *reinterpret_cast<int32_t*>(id_string) = info[1];
-  *reinterpret_cast<int32_t*>(id_string + 4) = info[3];
-  *reinterpret_cast<int32_t*>(id_string + 8) = info[2];
-  CpuIdData::id_string = id_string;
-
-  __cpuid(info, 1);
-  CpuIdData::sse41 = (info[2] & (1 << 19)) != 0;
-  CpuIdData::sse2 = (info[3] & (1 << 26)) != 0;
-
-  char* brand_string = new char[3 * 4 * sizeof(int32_t)];
-  for (intptr_t i = 0x80000002; i <= 0x80000004; i++) {
-    intptr_t off = (i - 0x80000002) * 4 * sizeof(int32_t);
-    __cpuid(info, i);
-    *reinterpret_cast<int32_t*>(brand_string + off) = info[0];
-    *reinterpret_cast<int32_t*>(brand_string + off + 4) = info[1];
-    *reinterpret_cast<int32_t*>(brand_string + off + 8) = info[2];
-    *reinterpret_cast<int32_t*>(brand_string + off + 12) = info[3];
-  }
-  CpuIdData::brand_string = brand_string;
-}
-
-
-bool CpuInfo::FieldContains(const char* field, const char* search_string) {
-  if (strcmp(field, fields_[kCpuInfoProcessor]) == 0) {
-    return strstr(CpuIdData::id_string, search_string);
-  } else if (strcmp(field, fields_[kCpuInfoModel]) == 0) {
-    return strstr(CpuIdData::brand_string, search_string);
-  } else if (strcmp(field, fields_[kCpuInfoFeatures]) == 0) {
-    if (strcmp(search_string, "sse2") == 0) {
-      return CpuIdData::sse2;
-    } else if (strcmp(search_string, "sse4.1") == 0) {
-      return CpuIdData::sse41;
-    } else {
-      return false;
-    }
-  } else {
-    UNIMPLEMENTED();
-  }
-  return false;
-}
-
-
-char* CpuInfo::ExtractField(const char* field) {
-  if (strcmp(field, fields_[kCpuInfoProcessor]) == 0) {
-    return CpuIdData::id_string;
-  } else if (strcmp(field, fields_[kCpuInfoModel]) == 0) {
-    return CpuIdData::brand_string;
-  } else {
-    UNIMPLEMENTED();
-  }
-  return NULL;
-}
-
-
-bool CpuInfo::HasField(const char* field) {
-  return (strcmp(field, fields_[kCpuInfoProcessor]) == 0) ||
-         (strcmp(field, fields_[kCpuInfoModel]) == 0) ||
-         (strcmp(field, fields_[kCpuInfoFeatures]) == 0);
-}
-
-
-const char* CpuInfo::fields_[kCpuInfoMax] = {0};
-void CpuInfo::InitializeFields() {
-  fields_[kCpuInfoProcessor] = "Processor";
-  fields_[kCpuInfoModel] = "Hardware";
-  fields_[kCpuInfoFeatures] = "Features";
-}
-
-}  // namespace dart
-
-#endif  // defined(TARGET_OS_WINDOWS)