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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the QtCore module of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #include "qsimd_p.h" |
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43 #include <QByteArray> |
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44 |
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45 #if defined(Q_OS_WINCE) |
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46 #include <windows.h> |
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47 #endif |
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48 |
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49 QT_BEGIN_NAMESPACE |
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50 |
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51 uint qDetectCPUFeatures() |
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52 { |
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53 static uint features = 0xffffffff; |
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54 if (features != 0xffffffff) |
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55 return features; |
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56 |
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57 #if defined (Q_OS_WINCE) |
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58 #if defined (ARM) |
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59 if (IsProcessorFeaturePresent(PF_ARM_INTEL_WMMX)) { |
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60 features = IWMMXT; |
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61 return features; |
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62 } |
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63 #elif defined(_X86_) |
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64 features = 0; |
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65 #if defined QT_HAVE_MMX |
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66 if (IsProcessorFeaturePresent(PF_MMX_INSTRUCTIONS_AVAILABLE)) |
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67 features |= MMX; |
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68 #endif |
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69 #if defined QT_HAVE_3DNOW |
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70 if (IsProcessorFeaturePresent(PF_3DNOW_INSTRUCTIONS_AVAILABLE)) |
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71 features |= MMX3DNOW; |
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72 #endif |
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73 return features; |
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74 #endif |
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75 features = 0; |
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76 return features; |
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77 #elif defined(QT_HAVE_IWMMXT) |
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78 // runtime detection only available when running as a previlegied process |
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79 static const bool doIWMMXT = !qgetenv("QT_NO_IWMMXT").toInt(); |
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80 features = doIWMMXT ? IWMMXT : 0; |
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81 return features; |
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82 #elif defined(QT_HAVE_NEON) |
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83 static const bool doNEON = !qgetenv("QT_NO_NEON").toInt(); |
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84 features = doNEON ? NEON : 0; |
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85 return features; |
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86 #else |
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87 features = 0; |
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88 #if defined(__x86_64__) || defined(Q_OS_WIN64) |
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89 features = MMX|SSE|SSE2|CMOV; |
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90 #elif defined(__ia64__) |
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91 features = MMX|SSE|SSE2; |
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92 #elif defined(__i386__) || defined(_M_IX86) |
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93 unsigned int extended_result = 0; |
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94 uint result = 0; |
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95 /* see p. 118 of amd64 instruction set manual Vol3 */ |
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96 #if defined(Q_CC_GNU) |
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97 asm ("push %%ebx\n" |
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98 "pushf\n" |
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99 "pop %%eax\n" |
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100 "mov %%eax, %%ebx\n" |
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101 "xor $0x00200000, %%eax\n" |
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102 "push %%eax\n" |
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103 "popf\n" |
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104 "pushf\n" |
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105 "pop %%eax\n" |
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106 "xor %%edx, %%edx\n" |
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107 "xor %%ebx, %%eax\n" |
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108 "jz 1f\n" |
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109 |
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110 "mov $0x00000001, %%eax\n" |
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111 "cpuid\n" |
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112 "1:\n" |
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113 "pop %%ebx\n" |
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114 "mov %%edx, %0\n" |
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115 : "=r" (result) |
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116 : |
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117 : "%eax", "%ecx", "%edx" |
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118 ); |
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119 |
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120 asm ("push %%ebx\n" |
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121 "pushf\n" |
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122 "pop %%eax\n" |
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123 "mov %%eax, %%ebx\n" |
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124 "xor $0x00200000, %%eax\n" |
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125 "push %%eax\n" |
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126 "popf\n" |
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127 "pushf\n" |
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128 "pop %%eax\n" |
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129 "xor %%edx, %%edx\n" |
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130 "xor %%ebx, %%eax\n" |
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131 "jz 2f\n" |
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132 |
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133 "mov $0x80000000, %%eax\n" |
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134 "cpuid\n" |
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135 "cmp $0x80000000, %%eax\n" |
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136 "jbe 2f\n" |
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137 "mov $0x80000001, %%eax\n" |
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138 "cpuid\n" |
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139 "2:\n" |
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140 "pop %%ebx\n" |
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141 "mov %%edx, %0\n" |
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142 : "=r" (extended_result) |
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143 : |
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144 : "%eax", "%ecx", "%edx" |
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145 ); |
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146 #elif defined (Q_OS_WIN) |
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147 _asm { |
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148 push eax |
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149 push ebx |
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150 push ecx |
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151 push edx |
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152 pushfd |
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153 pop eax |
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154 mov ebx, eax |
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155 xor eax, 00200000h |
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156 push eax |
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157 popfd |
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158 pushfd |
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159 pop eax |
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160 mov edx, 0 |
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161 xor eax, ebx |
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162 jz skip |
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163 |
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164 mov eax, 1 |
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165 cpuid |
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166 mov result, edx |
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167 skip: |
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168 pop edx |
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169 pop ecx |
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170 pop ebx |
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171 pop eax |
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172 } |
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173 |
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174 _asm { |
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175 push eax |
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176 push ebx |
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177 push ecx |
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178 push edx |
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179 pushfd |
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180 pop eax |
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181 mov ebx, eax |
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182 xor eax, 00200000h |
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183 push eax |
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184 popfd |
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185 pushfd |
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186 pop eax |
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187 mov edx, 0 |
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188 xor eax, ebx |
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189 jz skip2 |
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190 |
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191 mov eax, 80000000h |
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192 cpuid |
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193 cmp eax, 80000000h |
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194 jbe skip2 |
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195 mov eax, 80000001h |
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196 cpuid |
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197 mov extended_result, edx |
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198 skip2: |
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199 pop edx |
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200 pop ecx |
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201 pop ebx |
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202 pop eax |
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203 } |
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204 #endif |
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205 |
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206 // result now contains the standard feature bits |
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207 if (result & (1u << 15)) |
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208 features |= CMOV; |
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209 if (result & (1u << 23)) |
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210 features |= MMX; |
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211 if (extended_result & (1u << 22)) |
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212 features |= MMXEXT; |
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213 if (extended_result & (1u << 31)) |
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214 features |= MMX3DNOW; |
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215 if (extended_result & (1u << 30)) |
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216 features |= MMX3DNOWEXT; |
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217 if (result & (1u << 25)) |
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218 features |= SSE; |
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219 if (result & (1u << 26)) |
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220 features |= SSE2; |
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221 #endif // i386 |
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222 |
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223 #if defined(QT_HAVE_MMX) |
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224 if (qgetenv("QT_NO_MMX").toInt()) |
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225 features ^= MMX; |
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226 #endif |
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227 if (qgetenv("QT_NO_MMXEXT").toInt()) |
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228 features ^= MMXEXT; |
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229 |
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230 #if defined(QT_HAVE_3DNOW) |
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231 if (qgetenv("QT_NO_3DNOW").toInt()) |
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232 features ^= MMX3DNOW; |
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233 #endif |
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234 if (qgetenv("QT_NO_3DNOWEXT").toInt()) |
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235 features ^= MMX3DNOWEXT; |
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236 |
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237 #if defined(QT_HAVE_SSE) |
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238 if (qgetenv("QT_NO_SSE").toInt()) |
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239 features ^= SSE; |
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240 #endif |
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241 #if defined(QT_HAVE_SSE2) |
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242 if (qgetenv("QT_NO_SSE2").toInt()) |
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243 features ^= SSE2; |
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244 #endif |
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245 |
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246 return features; |
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247 #endif |
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248 } |
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249 |
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250 QT_END_NAMESPACE |