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-rw-r--r--media/libvpx/vpx_ports/arm_cpudetect.c175
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