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comparison: media/libtheora/lib/arm/armcpu.c
media/libtheora/lib/arm/armcpu.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:4276e324f579 |
|---|---|
| 1 /******************************************************************** | |
| 2 * * | |
| 3 * THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. * | |
| 4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * | |
| 5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * | |
| 6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * | |
| 7 * * | |
| 8 * THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2010 * | |
| 9 * by the Xiph.Org Foundation and contributors http://www.xiph.org/ * | |
| 10 * * | |
| 11 ******************************************************************** | |
| 12 | |
| 13 CPU capability detection for ARM processors. | |
| 14 | |
| 15 function: | |
| 16 last mod: $Id: cpu.c 17344 2010-07-21 01:42:18Z tterribe $ | |
| 17 | |
| 18 ********************************************************************/ | |
| 19 | |
| 20 #include "armcpu.h" | |
| 21 | |
| 22 #if !defined(OC_ARM_ASM)|| \ | |
| 23 !defined(OC_ARM_ASM_EDSP)&&!defined(OC_ARM_ASM_ARMV6)&& \ | |
| 24 !defined(OC_ARM_ASM_NEON) | |
| 25 ogg_uint32_t oc_cpu_flags_get(void){ | |
| 26 return 0; | |
| 27 } | |
| 28 | |
| 29 #elif defined(_MSC_VER) | |
| 30 /*For GetExceptionCode() and EXCEPTION_ILLEGAL_INSTRUCTION.*/ | |
| 31 # define WIN32_LEAN_AND_MEAN | |
| 32 # define WIN32_EXTRA_LEAN | |
| 33 # include <windows.h> | |
| 34 | |
| 35 ogg_uint32_t oc_cpu_flags_get(void){ | |
| 36 ogg_uint32_t flags; | |
| 37 flags=0; | |
| 38 /*MSVC has no inline __asm support for ARM, but it does let you __emit | |
| 39 instructions via their assembled hex code. | |
| 40 All of these instructions should be essentially nops.*/ | |
| 41 # if defined(OC_ARM_ASM_EDSP) | |
| 42 __try{ | |
| 43 /*PLD [r13]*/ | |
| 44 __emit(0xF5DDF000); | |
| 45 flags|=OC_CPU_ARM_EDSP; | |
| 46 } | |
| 47 __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){ | |
| 48 /*Ignore exception.*/ | |
| 49 } | |
| 50 # if defined(OC_ARM_ASM_MEDIA) | |
| 51 __try{ | |
| 52 /*SHADD8 r3,r3,r3*/ | |
| 53 __emit(0xE6333F93); | |
| 54 flags|=OC_CPU_ARM_MEDIA; | |
| 55 } | |
| 56 __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){ | |
| 57 /*Ignore exception.*/ | |
| 58 } | |
| 59 # if defined(OC_ARM_ASM_NEON) | |
| 60 __try{ | |
| 61 /*VORR q0,q0,q0*/ | |
| 62 __emit(0xF2200150); | |
| 63 flags|=OC_CPU_ARM_NEON; | |
| 64 } | |
| 65 __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){ | |
| 66 /*Ignore exception.*/ | |
| 67 } | |
| 68 # endif | |
| 69 # endif | |
| 70 # endif | |
| 71 return flags; | |
| 72 } | |
| 73 | |
| 74 #elif defined(__linux__) | |
| 75 # include <stdio.h> | |
| 76 # include <stdlib.h> | |
| 77 # include <string.h> | |
| 78 | |
| 79 ogg_uint32_t oc_cpu_flags_get(void){ | |
| 80 ogg_uint32_t flags; | |
| 81 FILE *fin; | |
| 82 flags=0; | |
| 83 /*Reading /proc/self/auxv would be easier, but that doesn't work reliably on | |
| 84 Android. | |
| 85 This also means that detection will fail in Scratchbox.*/ | |
| 86 fin=fopen("/proc/cpuinfo","r"); | |
| 87 if(fin!=NULL){ | |
| 88 /*512 should be enough for anybody (it's even enough for all the flags that | |
| 89 x86 has accumulated... so far).*/ | |
| 90 char buf[512]; | |
| 91 while(fgets(buf,511,fin)!=NULL){ | |
| 92 if(memcmp(buf,"Features",8)==0){ | |
| 93 char *p; | |
| 94 p=strstr(buf," edsp"); | |
| 95 if(p!=NULL&&(p[5]==' '||p[5]=='\n'))flags|=OC_CPU_ARM_EDSP; | |
| 96 p=strstr(buf," neon"); | |
| 97 if(p!=NULL&&(p[5]==' '||p[5]=='\n'))flags|=OC_CPU_ARM_NEON; | |
| 98 } | |
| 99 if(memcmp(buf,"CPU architecture:",17)==0){ | |
| 100 int version; | |
| 101 version=atoi(buf+17); | |
| 102 if(version>=6)flags|=OC_CPU_ARM_MEDIA; | |
| 103 } | |
| 104 } | |
| 105 fclose(fin); | |
| 106 } | |
| 107 return flags; | |
| 108 } | |
| 109 | |
| 110 #else | |
| 111 /*The feature registers which can tell us what the processor supports are | |
| 112 accessible in priveleged modes only, so we can't have a general user-space | |
| 113 detection method like on x86.*/ | |
| 114 # error "Configured to use ARM asm but no CPU detection method available for " \ | |
| 115 "your platform. Reconfigure with --disable-asm (or send patches)." | |
| 116 #endif |
