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annotate src/cpuinfo/SDL_cpuinfo.c @ 745:71ee03909f42

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Greatly simplified the SDL CPU info code
author Sam Lantinga <slouken@libsdl.org>
date Mon, 24 Nov 2003 09:16:52 +0000
parents 22dbf364c017
children da36f59485da
rev   line source
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
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1 /*
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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2 SDL - Simple DirectMedia Layer
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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4
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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5 This library is free software; you can redistribute it and/or
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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6 modify it under the terms of the GNU Library General Public
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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7 License as published by the Free Software Foundation; either
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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8 version 2 of the License, or (at your option) any later version.
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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9
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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10 This library is distributed in the hope that it will be useful,
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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13 Library General Public License for more details.
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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14
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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15 You should have received a copy of the GNU Library General Public
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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16 License along with this library; if not, write to the Free
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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18
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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19 Sam Lantinga
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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20 slouken@libsdl.org
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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21 */
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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22
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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28 /* CPU feature detection for SDL */
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29
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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30 #include "SDL.h"
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31 #include "SDL_cpuinfo.h"
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32
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33 #define CPU_HAS_RDTSC 0x00000001
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34 #define CPU_HAS_MMX 0x00000002
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35 #define CPU_HAS_3DNOW 0x00000004
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36 #define CPU_HAS_SSE 0x00000008
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37
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38 static __inline__ int CPU_haveCPUID()
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39 {
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40 int has_CPUID = 0;
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41 #if defined(__GNUC__) && defined(i386)
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42 __asm__ (
71ee03909f42 Greatly simplified the SDL CPU info code
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43 "push %%ecx\n"
71ee03909f42 Greatly simplified the SDL CPU info code
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44 " pushfl # Get original EFLAGS \n"
71ee03909f42 Greatly simplified the SDL CPU info code
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45 " popl %%eax \n"
71ee03909f42 Greatly simplified the SDL CPU info code
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46 " movl %%eax,%%ecx \n"
71ee03909f42 Greatly simplified the SDL CPU info code
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47 " xorl $0x200000,%%eax # Flip ID bit in EFLAGS \n"
71ee03909f42 Greatly simplified the SDL CPU info code
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48 " pushl %%eax # Save new EFLAGS value on stack \n"
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49 " popfl # Replace current EFLAGS value \n"
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50 " pushfl # Get new EFLAGS \n"
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51 " popl %%eax # Store new EFLAGS in EAX \n"
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52 " xorl %%ecx,%%eax # Can not toggle ID bit, \n"
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53 " jz 1f # Processor=80486 \n"
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54 " movl $1,%0 # We have CPUID support \n"
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55 "1: \n"
71ee03909f42 Greatly simplified the SDL CPU info code
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56 "pop %%ecx\n"
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57 : "=r" (has_CPUID)
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58 :
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59 : "%eax", "%ecx"
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60 );
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61 #elif defined(_MSC_VER)
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62 __asm__ {
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63 pushfd ; Get original EFLAGS
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64 pop eax
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65 mov ecx, eax
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66 xor eax, 200000h ; Flip ID bit in EFLAGS
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67 push eax ; Save new EFLAGS value on stack
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68 popfd ; Replace current EFLAGS value
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69 pushfd ; Get new EFLAGS
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70 pop eax ; Store new EFLAGS in EAX
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71 xor eax, ecx ; Can not toggle ID bit,
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72 jz done ; Processor=80486
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73 mov has_CPUID,1 ; We have CPUID support
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74 done:
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75 }
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76 #endif
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77 return has_CPUID;
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78 }
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79
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80 static __inline__ int CPU_getCPUIDFeatures()
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81 {
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82 int features = 0;
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83 #if defined(__GNUC__) && defined(i386)
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84 __asm__ (
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85 "push %%ebx\n"
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86 "push %%ecx\n"
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87 "push %%edx\n"
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88 " xorl %%eax,%%eax # Set up for CPUID instruction \n"
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89 " cpuid # Get and save vendor ID \n"
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90 " cmpl $1,%%eax # Make sure 1 is valid input for CPUID\n"
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91 " jl 1f # We dont have the CPUID instruction\n"
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92 " xorl %%eax,%%eax \n"
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93 " incl %%eax \n"
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94 " cpuid # Get family/model/stepping/features\n"
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95 " movl %%edx,%0 \n"
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96 "1: \n"
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97 "pop %%edx\n"
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98 "pop %%ecx\n"
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99 "pop %%ebx\n"
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100 : "=r" (features)
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101 :
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102 : "%eax", "%ebx", "%ecx", "%edx"
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103 );
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104 #elif defined(_MSC_VER)
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105 __asm__ {
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106 xor eax, eax ; Set up for CPUID instruction
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107 cpuid ; Get and save vendor ID
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108 cmp eax, 1 ; Make sure 1 is valid input for CPUID
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109 jl done ; We dont have the CPUID instruction
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110 xor eax, eax
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111 inc eax
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112 cpuid ; Get family/model/stepping/features
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113 mov features, edx
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114 done:
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115 }
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116 #endif
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117 return features;
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118 }
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119
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120 static __inline__ int CPU_haveRDTSC()
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121 {
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122 if ( CPU_haveCPUID() ) {
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123 return (CPU_getCPUIDFeatures() & 0x00000010);
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124 }
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125 return 0;
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126 }
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127
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128 static __inline__ int CPU_haveMMX()
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129 {
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130 if ( CPU_haveCPUID() ) {
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131 return (CPU_getCPUIDFeatures() & 0x00800000);
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132 }
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133 return 0;
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134 }
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135
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136 static __inline__ int CPU_have3DNow()
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137 {
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138 int has_3DNow = 0;
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139 #if defined(__GNUC__) && defined(i386)
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140 __asm__ (
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141 "push %%ebx\n"
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142 "push %%ecx\n"
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143 "push %%edx\n"
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144 " movl $0x80000000,%%eax # Query for extended functions \n"
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145 " cpuid # Get extended function limit \n"
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146 " cmpl $0x80000001,%%eax \n"
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147 " jbe 1f # Nope, we dont have function 800000001h\n"
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148 " movl $0x80000001,%%eax # Setup extended function 800000001h\n"
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149 " cpuid # and get the information \n"
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150 " testl $0x80000000,%%edx # Bit 31 is set if 3DNow! present \n"
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151 " jz 1f # Nope, we dont have 3DNow support\n"
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152 " movl $1,%0 # Yep, we have 3DNow! support! \n"
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153 "1: \n"
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154 "pop %%edx\n"
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155 "pop %%ecx\n"
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156 "pop %%ebx\n"
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157 : "=r" (has_3DNow)
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158 :
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159 : "%eax", "%ebx", "%ecx", "%edx"
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160 );
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161 #elif defined(_MSC_VER)
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162 __asm__ {
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163 mov eax,80000000h ; Query for extended functions
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164 cpuid ; Get extended function limit
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165 cmp eax,80000001h
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166 jbe done ; Nope, we dont have function 800000001h
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167 mov eax,80000001h ; Setup extended function 800000001h
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168 cpuid ; and get the information
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169 test edx,80000000h ; Bit 31 is set if 3DNow! present
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170 jz done ; Nope, we dont have 3DNow support
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171 mov has_3DNow,1 ; Yep, we have 3DNow! support!
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172 done:
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173 }
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174 #endif
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175 return has_3DNow;
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176 }
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177
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178 static __inline__ int CPU_haveSSE()
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179 {
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180 if ( CPU_haveCPUID() ) {
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181 return (CPU_getCPUIDFeatures() & 0x02000000);
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182 }
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183 return 0;
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184 }
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185
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186 static Uint32 SDL_CPUFeatures = 0xFFFFFFFF;
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187
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188 static Uint32 SDL_GetCPUFeatures()
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189 {
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190 if ( SDL_CPUFeatures == 0xFFFFFFFF ) {
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191 SDL_CPUFeatures = 0;
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192 if ( CPU_haveRDTSC() ) {
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193 SDL_CPUFeatures |= CPU_HAS_RDTSC;
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194 }
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195 if ( CPU_haveMMX() ) {
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196 SDL_CPUFeatures |= CPU_HAS_MMX;
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197 }
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198 if ( CPU_have3DNow() ) {
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199 SDL_CPUFeatures |= CPU_HAS_3DNOW;
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200 }
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201 if ( CPU_haveSSE() ) {
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202 SDL_CPUFeatures |= CPU_HAS_SSE;
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203 }
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204 }
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205 return SDL_CPUFeatures;
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206 }
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207
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208 SDL_bool SDL_HasRDTSC()
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209 {
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210 if ( SDL_GetCPUFeatures() & CPU_HAS_RDTSC ) {
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211 return SDL_TRUE;
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212 }
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213 return SDL_FALSE;
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214 }
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215
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216 SDL_bool SDL_HasMMX()
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217 {
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218 if ( SDL_GetCPUFeatures() & CPU_HAS_MMX ) {
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219 return SDL_TRUE;
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220 }
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221 return SDL_FALSE;
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222 }
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223
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224 SDL_bool SDL_Has3DNow()
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225 {
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226 if ( SDL_GetCPUFeatures() & CPU_HAS_3DNOW ) {
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227 return SDL_TRUE;
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228 }
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229 return SDL_FALSE;
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230 }
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231
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232 SDL_bool SDL_HasSSE()
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233 {
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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diff changeset
234 if ( SDL_GetCPUFeatures() & CPU_HAS_SSE ) {
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235 return SDL_TRUE;
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236 }
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237 return SDL_FALSE;
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238 }
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239
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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diff changeset
240 #ifdef TEST_MAIN
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241
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242 #include <stdio.h>
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243
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244 int main()
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245 {
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246 printf("MMX: %d\n", SDL_HasMMX());
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247 printf("3DNow: %d\n", SDL_Has3DNow());
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248 printf("SSE: %d\n", SDL_HasSSE());
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249 return 0;
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250 }
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251
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252 #endif /* TEST_MAIN */