1 files changed, 99 insertions, 0 deletions
diff --git a/third_party/dav1d/src/arm/cpu.c b/third_party/dav1d/src/arm/cpu.c
new file mode 100644
index 0000000000..b7a0d3adbc
--- /dev/null
+++ b/third_party/dav1d/src/arm/cpu.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright © 2018, VideoLAN and dav1d authors
+ * Copyright © 2018, Janne Grunau
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include "common/attributes.h"
+
+#include "src/arm/cpu.h"
+
+#if defined(__ARM_NEON) || defined(__APPLE__) || defined(_WIN32) || ARCH_AARCH64
+// NEON is always available; runtime tests are not needed.
+#elif defined(HAVE_GETAUXVAL) && ARCH_ARM
+#include <sys/auxv.h>
+
+#ifndef HWCAP_ARM_NEON
+#define HWCAP_ARM_NEON (1 << 12)
+#endif
+#define NEON_HWCAP HWCAP_ARM_NEON
+
+#elif defined(HAVE_ELF_AUX_INFO) && ARCH_ARM
+#include <sys/auxv.h>
+
+#define NEON_HWCAP HWCAP_NEON
+
+#elif defined(__ANDROID__)
+#include <stdio.h>
+#include <string.h>
+
+static unsigned parse_proc_cpuinfo(const char *flag) {
+    FILE *file = fopen("/proc/cpuinfo", "r");
+    if (!file)
+        return 0;
+
+    char line_buffer[120];
+    const char *line;
+
+    while ((line = fgets(line_buffer, sizeof(line_buffer), file))) {
+        if (strstr(line, flag)) {
+            fclose(file);
+            return 1;
+        }
+        // if line is incomplete seek back to avoid splitting the search
+        // string into two buffers
+        if (!strchr(line, '\n') && strlen(line) > strlen(flag)) {
+            // use fseek since the 64 bit fseeko is only available since
+            // Android API level 24 and meson defines _FILE_OFFSET_BITS
+            // by default 64
+            if (fseek(file, -strlen(flag), SEEK_CUR))
+                break;
+        }
+    }
+
+    fclose(file);
+
+    return 0;
+}
+#endif
+
+COLD unsigned dav1d_get_cpu_flags_arm(void) {
+    unsigned flags = 0;
+#if defined(__ARM_NEON) || defined(__APPLE__) || defined(_WIN32) || ARCH_AARCH64
+    flags |= DAV1D_ARM_CPU_FLAG_NEON;
+#elif defined(HAVE_GETAUXVAL) && ARCH_ARM
+    unsigned long hw_cap = getauxval(AT_HWCAP);
+    flags |= (hw_cap & NEON_HWCAP) ? DAV1D_ARM_CPU_FLAG_NEON : 0;
+#elif defined(HAVE_ELF_AUX_INFO) && ARCH_ARM
+    unsigned long hw_cap = 0;
+    elf_aux_info(AT_HWCAP, &hw_cap, sizeof(hw_cap));
+    flags |= (hw_cap & NEON_HWCAP) ? DAV1D_ARM_CPU_FLAG_NEON : 0;
+#elif defined(__ANDROID__)
+    flags |= parse_proc_cpuinfo("neon") ? DAV1D_ARM_CPU_FLAG_NEON : 0;
+#endif
+
+    return flags;
+}