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annotate src/cpuinfo/SDL_cpuinfo.c @ 778:8ac3f46f9d09

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Date: Tue, 6 Jan 2004 12:42:19 +0100 From: Max Horn Subject: SDL_HasAltiVec; BUGS file the attached patch adds SDL_HasAltiVec to SDL CVS. Note that at this point, this only works on MacOSX (and maybe darwin). I don't know how to properly add a test for e.g. Linux/PPC at this point. I found an email which might help in doing so: http://zebra.fh-weingarten.de/~maxi/html/mplayer-dev-eng/2003-01msg00783.html However, since I have no way to test on a non-OSX PowerPC system, I am not comfortable blindly adding such code... I just hope that if somebody from the Linux/PPC (or FreeBSD/PPC, or whatever) community notices this, they'll jump up and provide a patch for us ;-)
author Sam Lantinga <slouken@libsdl.org>
date Tue, 06 Jan 2004 17:18:38 +0000
parents b8d311d90021
children a2dde6aff60e
rev   line source
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22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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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
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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,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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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
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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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
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21 */
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22
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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
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28 /* CPU feature detection for SDL */
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29
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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 #ifdef MACOSX
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34 #include <sys/sysctl.h> /* For AltiVec check */
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35 #endif
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36
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37 #define CPU_HAS_RDTSC 0x00000001
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38 #define CPU_HAS_MMX 0x00000002
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39 #define CPU_HAS_3DNOW 0x00000004
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40 #define CPU_HAS_SSE 0x00000008
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41 #define CPU_HAS_ALTIVEC 0x00000010
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42
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43 static __inline__ int CPU_haveCPUID()
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44 {
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45 int has_CPUID = 0;
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46 #if defined(__GNUC__) && defined(i386)
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47 __asm__ (
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48 "push %%ecx\n"
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49 " pushfl # Get original EFLAGS \n"
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50 " popl %%eax \n"
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51 " movl %%eax,%%ecx \n"
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52 " xorl $0x200000,%%eax # Flip ID bit in EFLAGS \n"
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53 " pushl %%eax # Save new EFLAGS value on stack \n"
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54 " popfl # Replace current EFLAGS value \n"
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55 " pushfl # Get new EFLAGS \n"
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56 " popl %%eax # Store new EFLAGS in EAX \n"
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57 " xorl %%ecx,%%eax # Can not toggle ID bit, \n"
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58 " jz 1f # Processor=80486 \n"
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59 " movl $1,%0 # We have CPUID support \n"
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60 "1: \n"
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61 "pop %%ecx\n"
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62 : "=r" (has_CPUID)
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63 :
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64 : "%eax", "%ecx"
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65 );
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66 #elif defined(_MSC_VER)
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67 __asm {
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68 pushfd ; Get original EFLAGS
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69 pop eax
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70 mov ecx, eax
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71 xor eax, 200000h ; Flip ID bit in EFLAGS
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72 push eax ; Save new EFLAGS value on stack
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73 popfd ; Replace current EFLAGS value
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74 pushfd ; Get new EFLAGS
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75 pop eax ; Store new EFLAGS in EAX
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76 xor eax, ecx ; Can not toggle ID bit,
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77 jz done ; Processor=80486
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78 mov has_CPUID,1 ; We have CPUID support
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79 done:
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80 }
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81 #endif
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82 return has_CPUID;
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83 }
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84
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85 static __inline__ int CPU_getCPUIDFeatures()
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86 {
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87 int features = 0;
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88 #if defined(__GNUC__) && defined(i386)
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89 __asm__ (
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90 "push %%ebx\n"
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91 "push %%ecx\n"
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92 "push %%edx\n"
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93 " xorl %%eax,%%eax # Set up for CPUID instruction \n"
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94 " cpuid # Get and save vendor ID \n"
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95 " cmpl $1,%%eax # Make sure 1 is valid input for CPUID\n"
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96 " jl 1f # We dont have the CPUID instruction\n"
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97 " xorl %%eax,%%eax \n"
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98 " incl %%eax \n"
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99 " cpuid # Get family/model/stepping/features\n"
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100 " movl %%edx,%0 \n"
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101 "1: \n"
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102 "pop %%edx\n"
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103 "pop %%ecx\n"
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104 "pop %%ebx\n"
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105 : "=r" (features)
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106 :
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107 : "%eax", "%ebx", "%ecx", "%edx"
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108 );
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109 #elif defined(_MSC_VER)
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110 __asm {
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111 xor eax, eax ; Set up for CPUID instruction
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112 cpuid ; Get and save vendor ID
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113 cmp eax, 1 ; Make sure 1 is valid input for CPUID
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114 jl done ; We dont have the CPUID instruction
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115 xor eax, eax
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116 inc eax
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117 cpuid ; Get family/model/stepping/features
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118 mov features, edx
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119 done:
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120 }
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121 #endif
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122 return features;
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123 }
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124
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125 static __inline__ int CPU_haveRDTSC()
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126 {
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127 if ( CPU_haveCPUID() ) {
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128 return (CPU_getCPUIDFeatures() & 0x00000010);
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129 }
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130 return 0;
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131 }
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132
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133 static __inline__ int CPU_haveMMX()
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134 {
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diff changeset
135 if ( CPU_haveCPUID() ) {
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136 return (CPU_getCPUIDFeatures() & 0x00800000);
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137 }
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138 return 0;
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139 }
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140
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141 static __inline__ int CPU_have3DNow()
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142 {
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143 int has_3DNow = 0;
747
da36f59485da Check for CPUID before checking for 3DNow!
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144 if ( !CPU_haveCPUID() ) {
da36f59485da Check for CPUID before checking for 3DNow!
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diff changeset
145 return 0;
da36f59485da Check for CPUID before checking for 3DNow!
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diff changeset
146 }
745
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147 #if defined(__GNUC__) && defined(i386)
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148 __asm__ (
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
149 "push %%ebx\n"
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
150 "push %%ecx\n"
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diff changeset
151 "push %%edx\n"
71ee03909f42 Greatly simplified the SDL CPU info code
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152 " movl $0x80000000,%%eax # Query for extended functions \n"
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153 " cpuid # Get extended function limit \n"
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diff changeset
154 " cmpl $0x80000001,%%eax \n"
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
155 " jbe 1f # Nope, we dont have function 800000001h\n"
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156 " movl $0x80000001,%%eax # Setup extended function 800000001h\n"
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157 " cpuid # and get the information \n"
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158 " testl $0x80000000,%%edx # Bit 31 is set if 3DNow! present \n"
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159 " jz 1f # Nope, we dont have 3DNow support\n"
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160 " movl $1,%0 # Yep, we have 3DNow! support! \n"
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161 "1: \n"
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162 "pop %%edx\n"
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163 "pop %%ecx\n"
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164 "pop %%ebx\n"
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165 : "=r" (has_3DNow)
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166 :
71ee03909f42 Greatly simplified the SDL CPU info code
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167 : "%eax", "%ebx", "%ecx", "%edx"
71ee03909f42 Greatly simplified the SDL CPU info code
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168 );
71ee03909f42 Greatly simplified the SDL CPU info code
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169 #elif defined(_MSC_VER)
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170 __asm {
745
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171 mov eax,80000000h ; Query for extended functions
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172 cpuid ; Get extended function limit
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173 cmp eax,80000001h
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174 jbe done ; Nope, we dont have function 800000001h
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175 mov eax,80000001h ; Setup extended function 800000001h
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diff changeset
176 cpuid ; and get the information
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177 test edx,80000000h ; Bit 31 is set if 3DNow! present
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178 jz done ; Nope, we dont have 3DNow support
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179 mov has_3DNow,1 ; Yep, we have 3DNow! support!
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180 done:
71ee03909f42 Greatly simplified the SDL CPU info code
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181 }
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182 #endif
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183 return has_3DNow;
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184 }
71ee03909f42 Greatly simplified the SDL CPU info code
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185
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186 static __inline__ int CPU_haveSSE()
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187 {
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188 if ( CPU_haveCPUID() ) {
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189 return (CPU_getCPUIDFeatures() & 0x02000000);
71ee03909f42 Greatly simplified the SDL CPU info code
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190 }
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191 return 0;
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diff changeset
192 }
739
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193
778
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194 static __inline__ int CPU_haveAltiVec()
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195 {
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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196 #ifdef MACOSX
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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197 /* TODO: This check works on OS X. It would be nice to detect AltiVec
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198 properly on for example Linux/PPC, too. But I don't know how that
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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199 is done in Linux (or FreeBSD, or whatever other OS you run PPC :-)
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200 */
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diff changeset
201 int selectors[2] = { CTL_HW, HW_VECTORUNIT };
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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202 int hasVectorUnit = 0;
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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diff changeset
203 size_t length = sizeof(hasVectorUnit);
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204 int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0);
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205 if( 0 == error )
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206 return hasVectorUnit != 0;
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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207 #endif
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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208 return 0;
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209 }
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210
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211 static Uint32 SDL_CPUFeatures = 0xFFFFFFFF;
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diff changeset
212
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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diff changeset
213 static Uint32 SDL_GetCPUFeatures()
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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diff changeset
214 {
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
215 if ( SDL_CPUFeatures == 0xFFFFFFFF ) {
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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diff changeset
216 SDL_CPUFeatures = 0;
745
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217 if ( CPU_haveRDTSC() ) {
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218 SDL_CPUFeatures |= CPU_HAS_RDTSC;
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
219 }
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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diff changeset
220 if ( CPU_haveMMX() ) {
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
221 SDL_CPUFeatures |= CPU_HAS_MMX;
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
222 }
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
223 if ( CPU_have3DNow() ) {
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
224 SDL_CPUFeatures |= CPU_HAS_3DNOW;
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
225 }
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
226 if ( CPU_haveSSE() ) {
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
227 SDL_CPUFeatures |= CPU_HAS_SSE;
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
228 }
778
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229 if ( CPU_haveAltiVec() ) {
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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parents: 769
diff changeset
230 SDL_CPUFeatures |= CPU_HAS_ALTIVEC;
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diff changeset
231 }
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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diff changeset
232 }
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
233 return SDL_CPUFeatures;
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
234 }
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
235
745
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
236 SDL_bool SDL_HasRDTSC()
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
237 {
71ee03909f42 Greatly simplified the SDL CPU info code
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parents: 739
diff changeset
238 if ( SDL_GetCPUFeatures() & CPU_HAS_RDTSC ) {
71ee03909f42 Greatly simplified the SDL CPU info code
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parents: 739
diff changeset
239 return SDL_TRUE;
71ee03909f42 Greatly simplified the SDL CPU info code
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parents: 739
diff changeset
240 }
71ee03909f42 Greatly simplified the SDL CPU info code
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parents: 739
diff changeset
241 return SDL_FALSE;
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
242 }
71ee03909f42 Greatly simplified the SDL CPU info code
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parents: 739
diff changeset
243
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
244 SDL_bool SDL_HasMMX()
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
245 {
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
246 if ( SDL_GetCPUFeatures() & CPU_HAS_MMX ) {
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
247 return SDL_TRUE;
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
248 }
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
249 return SDL_FALSE;
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
250 }
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
251
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
252 SDL_bool SDL_Has3DNow()
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
253 {
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
254 if ( SDL_GetCPUFeatures() & CPU_HAS_3DNOW ) {
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
255 return SDL_TRUE;
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
256 }
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
257 return SDL_FALSE;
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
258 }
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
259
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
260 SDL_bool SDL_HasSSE()
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
261 {
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
262 if ( SDL_GetCPUFeatures() & CPU_HAS_SSE ) {
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
263 return SDL_TRUE;
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
264 }
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
265 return SDL_FALSE;
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
266 }
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
267
778
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268 SDL_bool SDL_HasAltiVec()
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269 {
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270 if ( SDL_GetCPUFeatures() & CPU_HAS_ALTIVEC ) {
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271 return SDL_TRUE;
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272 }
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273 return SDL_FALSE;
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274 }
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275
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276 #ifdef TEST_MAIN
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277
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278 #include <stdio.h>
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279
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280 int main()
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281 {
778
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282 printf("RDTSC: %d\n", SDL_HasRDTSC());
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283 printf("MMX: %d\n", SDL_HasMMX());
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284 printf("3DNow: %d\n", SDL_Has3DNow());
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285 printf("SSE: %d\n", SDL_HasSSE());
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286 printf("AltiVec: %d\n", SDL_HasAltiVec());
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287 return 0;
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288 }
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289
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290 #endif /* TEST_MAIN */