/* * 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;}