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annotate src/cpuinfo/SDL_cpuinfo.c @ 1687:d36048e8e302 SDL-1.3

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author Sam Lantinga <slouken@libsdl.org>
date Sun, 18 Jun 2006 13:54:27 +0000
parents 4da1ee79c9af
children c901fd2a42da
rev   line source
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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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
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3 Copyright (C) 1997-2006 Sam Lantinga
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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
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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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 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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
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21 */
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22 #include "SDL_config.h"
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23
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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24 /* CPU feature detection for SDL */
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25
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26 #include "SDL.h"
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27 #include "SDL_cpuinfo.h"
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28
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29 #if defined(__MACOSX__) && defined(__ppc__)
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30 #include <sys/sysctl.h> /* For AltiVec check */
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31 #elif SDL_ALTIVEC_BLITTERS && HAVE_SETJMP
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32 #include <signal.h>
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33 #include <setjmp.h>
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34 #endif
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35
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36 #define CPU_HAS_RDTSC 0x00000001
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37 #define CPU_HAS_MMX 0x00000002
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38 #define CPU_HAS_MMXEXT 0x00000004
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39 #define CPU_HAS_3DNOW 0x00000010
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40 #define CPU_HAS_3DNOWEXT 0x00000020
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41 #define CPU_HAS_SSE 0x00000040
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42 #define CPU_HAS_SSE2 0x00000080
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43 #define CPU_HAS_ALTIVEC 0x00000100
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44
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45 #if SDL_ALTIVEC_BLITTERS && HAVE_SETJMP && !__MACOSX__
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46 /* This is the brute force way of detecting instruction sets...
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47 the idea is borrowed from the libmpeg2 library - thanks!
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48 */
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49 static jmp_buf jmpbuf;
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50 static void
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51 illegal_instruction(int sig)
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52 {
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53 longjmp(jmpbuf, 1);
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54 }
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55 #endif /* HAVE_SETJMP */
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56
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57 static __inline__ int
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58 CPU_haveCPUID(void)
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59 {
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60 int has_CPUID = 0;
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61 #if defined(__GNUC__) && defined(i386)
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62 __asm__(" pushfl # Get original EFLAGS \n" " popl %%eax \n" " movl %%eax,%%ecx \n" " xorl $0x200000,%%eax # Flip ID bit in EFLAGS \n" " pushl %%eax # Save new EFLAGS value on stack \n" " popfl # Replace current EFLAGS value \n" " pushfl # Get new EFLAGS \n" " popl %%eax # Store new EFLAGS in EAX \n" " xorl %%ecx,%%eax # Can not toggle ID bit, \n" " jz 1f # Processor=80486 \n" " movl $1,%0 # We have CPUID support \n" "1: \n": "=m"(has_CPUID):
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63 :"%eax", "%ecx");
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64 #elif defined(__GNUC__) && defined(__x86_64__)
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65 /* Technically, if this is being compiled under __x86_64__ then it has
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66 CPUid by definition. But it's nice to be able to prove it. :) */
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67 __asm__(" pushfq # Get original EFLAGS \n" " popq %%rax \n" " movq %%rax,%%rcx \n" " xorl $0x200000,%%eax # Flip ID bit in EFLAGS \n" " pushq %%rax # Save new EFLAGS value on stack \n" " popfq # Replace current EFLAGS value \n" " pushfq # Get new EFLAGS \n" " popq %%rax # Store new EFLAGS in EAX \n" " xorl %%ecx,%%eax # Can not toggle ID bit, \n" " jz 1f # Processor=80486 \n" " movl $1,%0 # We have CPUID support \n" "1: \n": "=m"(has_CPUID):
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68 :"%rax", "%rcx");
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69 #elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
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70 __asm {
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71 pushfd;
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72 Get original EFLAGS pop eax mov ecx, eax xor eax, 200000 h;
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73 Flip ID bit in EFLAGS push eax;
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74 Save new EFLAGS value on stack popfd;
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75 Replace current EFLAGS value pushfd;
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76 Get new EFLAGS pop eax;
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77 Store new EFLAGS in EAX xor eax, ecx;
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78 Can not toggle ID bit, jz done;
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79 Processor = 80486 mov has_CPUID, 1;
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80 We have CPUID support done:}
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81 #elif defined(__sun) && defined(__x86)
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82 __asm(" pushfl \n"
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83 " popl %eax \n"
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84 " movl %eax,%ecx \n"
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85 " xorl $0x200000,%eax \n"
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86 " pushl %eax \n"
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87 " popfl \n"
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88 " pushfl \n"
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89 " popl %eax \n"
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90 " xorl %ecx,%eax \n"
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91 " jz 1f \n"
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92 " movl $1,-8(%ebp) \n"
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93 "1: \n");
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94 #elif defined(__sun) && defined(__amd64)
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95 __asm(" pushfq \n"
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96 " popq %rax \n"
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97 " movq %rax,%rcx \n"
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98 " xorl $0x200000,%eax \n"
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99 " pushq %rax \n"
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100 " popfq \n"
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101 " pushfq \n"
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102 " popq %rax \n"
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103 " xorl %ecx,%eax \n"
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104 " jz 1f \n"
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105 " movl $1,-8(%rbp) \n"
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106 "1: \n");
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107 #endif
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108 return has_CPUID;
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109 }
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110
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111 static __inline__ int
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112 CPU_getCPUIDFeatures(void)
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113 {
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114 int features = 0;
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115 #if defined(__GNUC__) && ( defined(i386) || defined(__x86_64__) )
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116 __asm__(" movl %%ebx,%%edi\n" " xorl %%eax,%%eax # Set up for CPUID instruction \n" " cpuid # Get and save vendor ID \n" " cmpl $1,%%eax # Make sure 1 is valid input for CPUID\n" " jl 1f # We dont have the CPUID instruction\n" " xorl %%eax,%%eax \n" " incl %%eax \n" " cpuid # Get family/model/stepping/features\n" " movl %%edx,%0 \n" "1: \n" " movl %%edi,%%ebx\n": "=m"(features):
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117 :"%eax", "%ecx", "%edx", "%edi");
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118 #elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
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119 __asm {
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120 xor eax, eax;
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121 Set up for CPUID instruction
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122 cpuid; Get and save vendor ID
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123 cmp eax, 1; Make sure 1 is valid input for CPUID
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124 jl done; We dont have the CPUID instruction
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125 xor eax, eax
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126 inc eax
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127 cpuid; Get family / model / stepping / features
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128 mov features, edx done:}
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129 #elif defined(__sun) && (defined(__x86) || defined(__amd64))
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130 __asm
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131 (" movl %ebx,%edi\n"
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132 " xorl %eax,%eax \n"
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133 " cpuid \n"
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134 " cmpl $1,%eax \n"
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135 " jl 1f \n"
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136 " xorl %eax,%eax \n"
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137 " incl %eax \n"
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138 " cpuid \n"
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139 #ifdef __i386
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140 " movl %edx,-8(%ebp) \n"
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141 #else
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142 " movl %edx,-8(%rbp) \n"
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143 #endif
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144 "1: \n"
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145 " movl %edi,%ebx\n");
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146 #endif
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147 return features;
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148 }
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149
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150 static __inline__ int
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151 CPU_getCPUIDFeaturesExt(void)
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152 {
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153 int features = 0;
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9eb85a211abd Date: Tue, 30 Mar 2004 18:18:13 -0600
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154 #if defined(__GNUC__) && (defined(i386) || defined (__x86_64__) )
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155 __asm__(" movl %%ebx,%%edi\n" " movl $0x80000000,%%eax # Query for extended functions \n" " cpuid # Get extended function limit \n" " cmpl $0x80000001,%%eax \n" " jl 1f # Nope, we dont have function 800000001h\n" " movl $0x80000001,%%eax # Setup extended function 800000001h\n" " cpuid # and get the information \n" " movl %%edx,%0 \n" "1: \n" " movl %%edi,%%ebx\n": "=m"(features):
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156 :"%eax", "%ecx", "%edx", "%edi");
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157 #elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
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158 __asm {
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159 mov eax, 80000000 h;
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160 Query for extended functions
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161 cpuid; Get extended function limit
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162 cmp eax, 80000001 h jl done; Nope
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163 , we dont have function 800000001 h mov eax, 80000001 h;
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164 Setup extended function 800000001 h cpuid;
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165 and get the information mov features, edx done:}
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166 #elif defined(__sun) && ( defined(__i386) || defined(__amd64) )
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167 __asm(" movl %ebx,%edi\n"
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168 " movl $0x80000000,%eax \n"
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169 " cpuid \n"
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170 " cmpl $0x80000001,%eax \n"
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171 " jl 1f \n"
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172 " movl $0x80000001,%eax \n"
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173 " cpuid \n"
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174 #ifdef __i386
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175 " movl %edx,-8(%ebp) \n"
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176 #else
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177 " movl %edx,-8(%rbp) \n"
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178 #endif
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179 "1: \n"
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180 " movl %edi,%ebx\n");
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181 #endif
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182 return features;
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183 }
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184
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185 static __inline__ int
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186 CPU_haveRDTSC(void)
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187 {
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188 if (CPU_haveCPUID()) {
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189 return (CPU_getCPUIDFeatures() & 0x00000010);
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190 }
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191 return 0;
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192 }
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193
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194 static __inline__ int
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195 CPU_haveMMX(void)
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196 {
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197 if (CPU_haveCPUID()) {
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198 return (CPU_getCPUIDFeatures() & 0x00800000);
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199 }
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200 return 0;
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201 }
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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202
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203 static __inline__ int
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204 CPU_haveMMXExt(void)
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205 {
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206 if (CPU_haveCPUID()) {
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207 return (CPU_getCPUIDFeaturesExt() & 0x00400000);
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208 }
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209 return 0;
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210 }
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211
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212 static __inline__ int
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213 CPU_have3DNow(void)
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214 {
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215 if (CPU_haveCPUID()) {
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216 return (CPU_getCPUIDFeaturesExt() & 0x80000000);
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217 }
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218 return 0;
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219 }
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220
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221 static __inline__ int
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222 CPU_have3DNowExt(void)
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223 {
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224 if (CPU_haveCPUID()) {
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225 return (CPU_getCPUIDFeaturesExt() & 0x40000000);
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226 }
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227 return 0;
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228 }
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229
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230 static __inline__ int
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231 CPU_haveSSE(void)
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232 {
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233 if (CPU_haveCPUID()) {
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234 return (CPU_getCPUIDFeatures() & 0x02000000);
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235 }
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236 return 0;
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237 }
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238
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239 static __inline__ int
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240 CPU_haveSSE2(void)
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241 {
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242 if (CPU_haveCPUID()) {
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243 return (CPU_getCPUIDFeatures() & 0x04000000);
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244 }
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245 return 0;
785
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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246 }
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247
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248 static __inline__ int
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249 CPU_haveAltiVec(void)
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250 {
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251 volatile int altivec = 0;
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252 #if defined(__MACOSX__) && defined(__ppc__)
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253 int selectors[2] = { CTL_HW, HW_VECTORUNIT };
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254 int hasVectorUnit = 0;
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255 size_t length = sizeof(hasVectorUnit);
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256 int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0);
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257 if (0 == error)
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258 altivec = (hasVectorUnit != 0);
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259 #elif SDL_ALTIVEC_BLITTERS && HAVE_SETJMP
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260 void (*handler) (int sig);
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261 handler = signal(SIGILL, illegal_instruction);
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262 if (setjmp(jmpbuf) == 0) {
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263 asm volatile ("mtspr 256, %0\n\t" "vand %%v0, %%v0, %%v0"::"r" (-1));
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264 altivec = 1;
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265 }
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266 signal(SIGILL, handler);
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267 #endif
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268 return altivec;
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269 }
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270
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271 static Uint32 SDL_CPUFeatures = 0xFFFFFFFF;
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272
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273 static Uint32
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274 SDL_GetCPUFeatures(void)
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275 {
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276 if (SDL_CPUFeatures == 0xFFFFFFFF) {
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277 SDL_CPUFeatures = 0;
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278 if (CPU_haveRDTSC()) {
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279 SDL_CPUFeatures |= CPU_HAS_RDTSC;
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280 }
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281 if (CPU_haveMMX()) {
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282 SDL_CPUFeatures |= CPU_HAS_MMX;
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283 }
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284 if (CPU_haveMMXExt()) {
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285 SDL_CPUFeatures |= CPU_HAS_MMXEXT;
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286 }
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287 if (CPU_have3DNow()) {
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288 SDL_CPUFeatures |= CPU_HAS_3DNOW;
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289 }
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290 if (CPU_have3DNowExt()) {
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291 SDL_CPUFeatures |= CPU_HAS_3DNOWEXT;
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292 }
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293 if (CPU_haveSSE()) {
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294 SDL_CPUFeatures |= CPU_HAS_SSE;
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295 }
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296 if (CPU_haveSSE2()) {
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297 SDL_CPUFeatures |= CPU_HAS_SSE2;
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298 }
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299 if (CPU_haveAltiVec()) {
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300 SDL_CPUFeatures |= CPU_HAS_ALTIVEC;
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301 }
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302 }
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303 return SDL_CPUFeatures;
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304 }
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305
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306 SDL_bool
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307 SDL_HasRDTSC(void)
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308 {
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309 if (SDL_GetCPUFeatures() & CPU_HAS_RDTSC) {
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310 return SDL_TRUE;
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311 }
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312 return SDL_FALSE;
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313 }
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314
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315 SDL_bool
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316 SDL_HasMMX(void)
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317 {
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318 if (SDL_GetCPUFeatures() & CPU_HAS_MMX) {
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319 return SDL_TRUE;
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320 }
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321 return SDL_FALSE;
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322 }
71ee03909f42 Greatly simplified the SDL CPU info code
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323
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324 SDL_bool
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325 SDL_HasMMXExt(void)
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diff changeset
326 {
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327 if (SDL_GetCPUFeatures() & CPU_HAS_MMXEXT) {
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328 return SDL_TRUE;
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329 }
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330 return SDL_FALSE;
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diff changeset
331 }
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diff changeset
332
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333 SDL_bool
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334 SDL_Has3DNow(void)
804
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335 {
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336 if (SDL_GetCPUFeatures() & CPU_HAS_3DNOW) {
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337 return SDL_TRUE;
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338 }
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339 return SDL_FALSE;
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340 }
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diff changeset
341
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342 SDL_bool
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343 SDL_Has3DNowExt(void)
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344 {
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345 if (SDL_GetCPUFeatures() & CPU_HAS_3DNOWEXT) {
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346 return SDL_TRUE;
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347 }
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348 return SDL_FALSE;
804
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349 }
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350
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351 SDL_bool
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352 SDL_HasSSE(void)
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353 {
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354 if (SDL_GetCPUFeatures() & CPU_HAS_SSE) {
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355 return SDL_TRUE;
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356 }
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357 return SDL_FALSE;
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358 }
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359
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360 SDL_bool
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361 SDL_HasSSE2(void)
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362 {
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363 if (SDL_GetCPUFeatures() & CPU_HAS_SSE2) {
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364 return SDL_TRUE;
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365 }
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366 return SDL_FALSE;
804
b2fda076b02e *** empty log message ***
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367 }
b2fda076b02e *** empty log message ***
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368
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369 SDL_bool
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370 SDL_HasAltiVec(void)
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371 {
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372 if (SDL_GetCPUFeatures() & CPU_HAS_ALTIVEC) {
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373 return SDL_TRUE;
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374 }
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375 return SDL_FALSE;
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376 }
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377
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378 #ifdef TEST_MAIN
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379
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380 #include <stdio.h>
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381
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382 int
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383 main()
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384 {
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385 printf("RDTSC: %d\n", SDL_HasRDTSC());
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386 printf("MMX: %d\n", SDL_HasMMX());
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387 printf("MMXExt: %d\n", SDL_HasMMXExt());
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388 printf("3DNow: %d\n", SDL_Has3DNow());
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389 printf("3DNowExt: %d\n", SDL_Has3DNowExt());
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390 printf("SSE: %d\n", SDL_HasSSE());
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391 printf("SSE2: %d\n", SDL_HasSSE2());
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392 printf("AltiVec: %d\n", SDL_HasAltiVec());
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393 return 0;
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394 }
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395
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396 #endif /* TEST_MAIN */
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397 /* vi: set ts=4 sw=4 expandtab: */