diff options
Diffstat (limited to 'media/libvpx/vpx_ports/arm_cpudetect.c')
| -rw-r--r-- | media/libvpx/vpx_ports/arm_cpudetect.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/media/libvpx/vpx_ports/arm_cpudetect.c b/media/libvpx/vpx_ports/arm_cpudetect.c new file mode 100644 index 000000000..8a4b8af96 --- /dev/null +++ b/media/libvpx/vpx_ports/arm_cpudetect.c @@ -0,0 +1,175 @@ +/* + * Copyright (c) 2010 The WebM project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#include <stdlib.h> +#include <string.h> +#include "vpx_ports/arm.h" +#include "./vpx_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("VPX_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("VPX_SIMD_CAPS_MASK"); + return env && *env ? (int)strtol(env, NULL, 0) : ~0; +} + +#if !CONFIG_RUNTIME_CPU_DETECT + +int 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_MEDIA + flags |= HAS_MEDIA; +#endif /* HAVE_MEDIA */ +#if HAVE_NEON || HAVE_NEON_ASM + flags |= HAS_NEON; +#endif /* HAVE_NEON || HAVE_NEON_ASM */ + return flags & mask; +} + +#elif defined(_MSC_VER) /* end !CONFIG_RUNTIME_CPU_DETECT */ +/*For GetExceptionCode() and EXCEPTION_ILLEGAL_INSTRUCTION.*/ +#define WIN32_LEAN_AND_MEAN +#define WIN32_EXTRA_LEAN +#include <windows.h> + +int 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_MEDIA + if (mask & HAS_MEDIA) + __try { + /*SHADD8 r3,r3,r3*/ + __emit(0xE6333F93); + flags |= HAS_MEDIA; + } __except (GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION) { + /*Ignore exception.*/ + } +} +#endif /* HAVE_MEDIA */ +#if HAVE_NEON || HAVE_NEON_ASM +if (mask &HAS_NEON) { + __try { + /*VORR q0,q0,q0*/ + __emit(0xF2200150); + flags |= HAS_NEON; + } __except (GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION) { + /*Ignore exception.*/ + } +} +#endif /* HAVE_NEON || HAVE_NEON_ASM */ +return flags & mask; +} + +#elif defined(__ANDROID__) /* end _MSC_VER */ +#include <cpu-features.h> + +int 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_MEDIA + flags |= HAS_MEDIA; +#endif /* HAVE_MEDIA */ +#if HAVE_NEON || HAVE_NEON_ASM + if (features & ANDROID_CPU_ARM_FEATURE_NEON) + flags |= HAS_NEON; +#endif /* HAVE_NEON || HAVE_NEON_ASM */ + return flags & mask; +} + +#elif defined(__linux__) /* end __ANDROID__ */ + +#include <stdio.h> + +int 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 || HAVE_NEON_ASM + 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 || HAVE_NEON_ASM */ +#if HAVE_MEDIA + if (memcmp(buf, "CPU architecture:", 17) == 0) { + int version; + version = atoi(buf + 17); + if (version >= 6) { + flags |= HAS_MEDIA; + } + } +#endif /* HAVE_MEDIA */ + } + fclose(fin); + } + return flags & mask; +} +#else /* end __linux__ */ +#error "--enable-runtime-cpu-detect selected, but no CPU detection method " \ +"available for your platform. Reconfigure with --disable-runtime-cpu-detect." +#endif |