| /* |
| * Copyright (c) 2016, Alliance for Open Media. All rights reserved |
| * |
| * This source code is subject to the terms of the BSD 2 Clause License and |
| * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License |
| * was not distributed with this source code in the LICENSE file, you can |
| * obtain it at www.aomedia.org/license/software. If the Alliance for Open |
| * Media Patent License 1.0 was not distributed with this source code in the |
| * PATENTS file, you can obtain it at www.aomedia.org/license/patent. |
| */ |
| |
| #include <stdlib.h> |
| #include <string.h> |
| #include "aom_ports/arm.h" |
| #include "config/aom_config.h" |
| |
| #ifdef WINAPI_FAMILY |
| #include <winapifamily.h> |
| #if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) |
| #define getenv(x) NULL |
| #endif |
| #endif |
| |
| static int arm_cpu_env_flags(int *flags) { |
| char *env; |
| env = getenv("AOM_SIMD_CAPS"); |
| if (env && *env) { |
| *flags = (int)strtol(env, NULL, 0); |
| return 0; |
| } |
| *flags = 0; |
| return -1; |
| } |
| |
| static int arm_cpu_env_mask(void) { |
| char *env; |
| env = getenv("AOM_SIMD_CAPS_MASK"); |
| return env && *env ? (int)strtol(env, NULL, 0) : ~0; |
| } |
| |
| #if !CONFIG_RUNTIME_CPU_DETECT || defined(__APPLE__) |
| |
| int aom_arm_cpu_caps(void) { |
| /* This function should actually be a no-op. There is no way to adjust any of |
| * these because the RTCD tables do not exist: the functions are called |
| * statically */ |
| int flags; |
| int mask; |
| if (!arm_cpu_env_flags(&flags)) { |
| return flags; |
| } |
| mask = arm_cpu_env_mask(); |
| #if HAVE_NEON |
| flags |= HAS_NEON; |
| #endif /* HAVE_NEON */ |
| return flags & mask; |
| } |
| |
| #elif defined(_MSC_VER) /* end !CONFIG_RUNTIME_CPU_DETECT || __APPLE__ */ |
| /*For GetExceptionCode() and EXCEPTION_ILLEGAL_INSTRUCTION.*/ |
| #undef WIN32_LEAN_AND_MEAN |
| #define WIN32_LEAN_AND_MEAN |
| #undef WIN32_EXTRA_LEAN |
| #define WIN32_EXTRA_LEAN |
| #include <windows.h> |
| |
| int aom_arm_cpu_caps(void) { |
| int flags; |
| int mask; |
| if (!arm_cpu_env_flags(&flags)) { |
| return flags; |
| } |
| mask = arm_cpu_env_mask(); |
| /* MSVC has no inline __asm support for ARM, but it does let you __emit |
| * instructions via their assembled hex code. |
| * All of these instructions should be essentially nops. |
| */ |
| #if HAVE_NEON |
| if (mask & HAS_NEON) { |
| __try { |
| /*VORR q0,q0,q0*/ |
| __emit(0xF2200150); |
| flags |= HAS_NEON; |
| } __except (GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION) { |
| /*Ignore exception.*/ |
| } |
| } |
| #endif /* HAVE_NEON */ |
| return flags & mask; |
| } |
| |
| #elif defined(__ANDROID__) /* end _MSC_VER */ |
| #include <cpu-features.h> |
| |
| int aom_arm_cpu_caps(void) { |
| int flags; |
| int mask; |
| uint64_t features; |
| if (!arm_cpu_env_flags(&flags)) { |
| return flags; |
| } |
| mask = arm_cpu_env_mask(); |
| features = android_getCpuFeatures(); |
| |
| #if HAVE_NEON |
| if (features & ANDROID_CPU_ARM_FEATURE_NEON) flags |= HAS_NEON; |
| #endif /* HAVE_NEON */ |
| return flags & mask; |
| } |
| |
| #elif defined(__linux__) /* end __ANDROID__ */ |
| |
| #include <stdio.h> |
| |
| int aom_arm_cpu_caps(void) { |
| FILE *fin; |
| int flags; |
| int mask; |
| if (!arm_cpu_env_flags(&flags)) { |
| return flags; |
| } |
| mask = arm_cpu_env_mask(); |
| /* Reading /proc/self/auxv would be easier, but that doesn't work reliably |
| * on Android. |
| * This also means that detection will fail in Scratchbox. |
| */ |
| fin = fopen("/proc/cpuinfo", "r"); |
| if (fin != NULL) { |
| /* 512 should be enough for anybody (it's even enough for all the flags |
| * that x86 has accumulated... so far). |
| */ |
| char buf[512]; |
| while (fgets(buf, 511, fin) != NULL) { |
| #if HAVE_NEON |
| if (memcmp(buf, "Features", 8) == 0) { |
| char *p; |
| p = strstr(buf, " neon"); |
| if (p != NULL && (p[5] == ' ' || p[5] == '\n')) { |
| flags |= HAS_NEON; |
| } |
| } |
| #endif /* HAVE_NEON */ |
| } |
| fclose(fin); |
| } |
| return flags & mask; |
| } |
| #else /* end __linux__ */ |
| #error \ |
| "Runtime CPU detection selected, but no CPU detection method " \ |
| "available for your platform. Rerun cmake with -DCONFIG_RUNTIME_CPU_DETECT=0." |
| #endif |