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comparison: media/libvpx/vpx_ports/arm_cpudetect.c
media/libvpx/vpx_ports/arm_cpudetect.c
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| -1:000000000000 | 0:792bc8c3d332 |
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| 1 /* | |
| 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license | |
| 5 * that can be found in the LICENSE file in the root of the source | |
| 6 * tree. An additional intellectual property rights grant can be found | |
| 7 * in the file PATENTS. All contributing project authors may | |
| 8 * be found in the AUTHORS file in the root of the source tree. | |
| 9 */ | |
| 10 | |
| 11 #include <stdlib.h> | |
| 12 #include <string.h> | |
| 13 #include "arm.h" | |
| 14 | |
| 15 static int arm_cpu_env_flags(int *flags) { | |
| 16 char *env; | |
| 17 env = getenv("VPX_SIMD_CAPS"); | |
| 18 if (env && *env) { | |
| 19 *flags = (int)strtol(env, NULL, 0); | |
| 20 return 0; | |
| 21 } | |
| 22 *flags = 0; | |
| 23 return -1; | |
| 24 } | |
| 25 | |
| 26 static int arm_cpu_env_mask(void) { | |
| 27 char *env; | |
| 28 env = getenv("VPX_SIMD_CAPS_MASK"); | |
| 29 return env && *env ? (int)strtol(env, NULL, 0) : ~0; | |
| 30 } | |
| 31 | |
| 32 #if !CONFIG_RUNTIME_CPU_DETECT | |
| 33 | |
| 34 int arm_cpu_caps(void) { | |
| 35 /* This function should actually be a no-op. There is no way to adjust any of | |
| 36 * these because the RTCD tables do not exist: the functions are called | |
| 37 * statically */ | |
| 38 int flags; | |
| 39 int mask; | |
| 40 if (!arm_cpu_env_flags(&flags)) { | |
| 41 return flags; | |
| 42 } | |
| 43 mask = arm_cpu_env_mask(); | |
| 44 #if HAVE_EDSP | |
| 45 flags |= HAS_EDSP; | |
| 46 #endif /* HAVE_EDSP */ | |
| 47 #if HAVE_MEDIA | |
| 48 flags |= HAS_MEDIA; | |
| 49 #endif /* HAVE_MEDIA */ | |
| 50 #if HAVE_NEON | |
| 51 flags |= HAS_NEON; | |
| 52 #endif /* HAVE_NEON */ | |
| 53 return flags & mask; | |
| 54 } | |
| 55 | |
| 56 #elif defined(_MSC_VER) /* end !CONFIG_RUNTIME_CPU_DETECT */ | |
| 57 /*For GetExceptionCode() and EXCEPTION_ILLEGAL_INSTRUCTION.*/ | |
| 58 #define WIN32_LEAN_AND_MEAN | |
| 59 #define WIN32_EXTRA_LEAN | |
| 60 #include <windows.h> | |
| 61 | |
| 62 int arm_cpu_caps(void) { | |
| 63 int flags; | |
| 64 int mask; | |
| 65 if (!arm_cpu_env_flags(&flags)) { | |
| 66 return flags; | |
| 67 } | |
| 68 mask = arm_cpu_env_mask(); | |
| 69 /* MSVC has no inline __asm support for ARM, but it does let you __emit | |
| 70 * instructions via their assembled hex code. | |
| 71 * All of these instructions should be essentially nops. | |
| 72 */ | |
| 73 #if HAVE_EDSP | |
| 74 if (mask & HAS_EDSP) { | |
| 75 __try { | |
| 76 /*PLD [r13]*/ | |
| 77 __emit(0xF5DDF000); | |
| 78 flags |= HAS_EDSP; | |
| 79 } __except (GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION) { | |
| 80 /*Ignore exception.*/ | |
| 81 } | |
| 82 } | |
| 83 #if HAVE_MEDIA | |
| 84 if (mask & HAS_MEDIA) | |
| 85 __try { | |
| 86 /*SHADD8 r3,r3,r3*/ | |
| 87 __emit(0xE6333F93); | |
| 88 flags |= HAS_MEDIA; | |
| 89 } __except (GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION) { | |
| 90 /*Ignore exception.*/ | |
| 91 } | |
| 92 } | |
| 93 #if HAVE_NEON | |
| 94 if (mask &HAS_NEON) { | |
| 95 __try { | |
| 96 /*VORR q0,q0,q0*/ | |
| 97 __emit(0xF2200150); | |
| 98 flags |= HAS_NEON; | |
| 99 } __except (GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION) { | |
| 100 /*Ignore exception.*/ | |
| 101 } | |
| 102 } | |
| 103 #endif /* HAVE_NEON */ | |
| 104 #endif /* HAVE_MEDIA */ | |
| 105 #endif /* HAVE_EDSP */ | |
| 106 return flags & mask; | |
| 107 } | |
| 108 | |
| 109 #elif defined(__ANDROID__) /* end _MSC_VER */ | |
| 110 #include <cpu-features.h> | |
| 111 | |
| 112 int arm_cpu_caps(void) { | |
| 113 int flags; | |
| 114 int mask; | |
| 115 uint64_t features; | |
| 116 if (!arm_cpu_env_flags(&flags)) { | |
| 117 return flags; | |
| 118 } | |
| 119 mask = arm_cpu_env_mask(); | |
| 120 features = android_getCpuFeatures(); | |
| 121 | |
| 122 #if HAVE_EDSP | |
| 123 flags |= HAS_EDSP; | |
| 124 #endif /* HAVE_EDSP */ | |
| 125 #if HAVE_MEDIA | |
| 126 flags |= HAS_MEDIA; | |
| 127 #endif /* HAVE_MEDIA */ | |
| 128 #if HAVE_NEON | |
| 129 if (features & ANDROID_CPU_ARM_FEATURE_NEON) | |
| 130 flags |= HAS_NEON; | |
| 131 #endif /* HAVE_NEON */ | |
| 132 return flags & mask; | |
| 133 } | |
| 134 | |
| 135 #elif defined(__linux__) /* end __ANDROID__ */ | |
| 136 | |
| 137 #include <stdio.h> | |
| 138 | |
| 139 int arm_cpu_caps(void) { | |
| 140 FILE *fin; | |
| 141 int flags; | |
| 142 int mask; | |
| 143 if (!arm_cpu_env_flags(&flags)) { | |
| 144 return flags; | |
| 145 } | |
| 146 mask = arm_cpu_env_mask(); | |
| 147 /* Reading /proc/self/auxv would be easier, but that doesn't work reliably | |
| 148 * on Android. | |
| 149 * This also means that detection will fail in Scratchbox. | |
| 150 */ | |
| 151 fin = fopen("/proc/cpuinfo", "r"); | |
| 152 if (fin != NULL) { | |
| 153 /* 512 should be enough for anybody (it's even enough for all the flags | |
| 154 * that x86 has accumulated... so far). | |
| 155 */ | |
| 156 char buf[512]; | |
| 157 while (fgets(buf, 511, fin) != NULL) { | |
| 158 #if HAVE_EDSP || HAVE_NEON | |
| 159 if (memcmp(buf, "Features", 8) == 0) { | |
| 160 char *p; | |
| 161 #if HAVE_EDSP | |
| 162 p = strstr(buf, " edsp"); | |
| 163 if (p != NULL && (p[5] == ' ' || p[5] == '\n')) { | |
| 164 flags |= HAS_EDSP; | |
| 165 } | |
| 166 #if HAVE_NEON | |
| 167 p = strstr(buf, " neon"); | |
| 168 if (p != NULL && (p[5] == ' ' || p[5] == '\n')) { | |
| 169 flags |= HAS_NEON; | |
| 170 } | |
| 171 #endif /* HAVE_NEON */ | |
| 172 #endif /* HAVE_EDSP */ | |
| 173 } | |
| 174 #endif /* HAVE_EDSP || HAVE_NEON */ | |
| 175 #if HAVE_MEDIA | |
| 176 if (memcmp(buf, "CPU architecture:", 17) == 0) { | |
| 177 int version; | |
| 178 version = atoi(buf + 17); | |
| 179 if (version >= 6) { | |
| 180 flags |= HAS_MEDIA; | |
| 181 } | |
| 182 } | |
| 183 #endif /* HAVE_MEDIA */ | |
| 184 } | |
| 185 fclose(fin); | |
| 186 } | |
| 187 return flags & mask; | |
| 188 } | |
| 189 #else /* end __linux__ */ | |
| 190 #error "--enable-runtime-cpu-detect selected, but no CPU detection method " \ | |
| 191 "available for your platform. Reconfigure with --disable-runtime-cpu-detect." | |
| 192 #endif |
