ref: 337d8f9457a1e311643c635dbede33e5a7873a16
dir: /src/arm/cpu.c/
/* * 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 "src/arm/cpu.h" #if 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)) { if (fseek(file, -strlen(flag), SEEK_CUR)) break; } } fclose(file); return 0; } #endif unsigned dav1d_get_cpu_flags_arm(void) { unsigned flags = 0; #if ARCH_AARCH64 flags |= DAV1D_ARM_CPU_FLAG_NEON; #elif defined(__ARM_NEON) 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; #elif defined(__APPLE__) flags |= DAV1D_ARM_CPU_FLAG_NEON; #elif defined(_WIN32) flags |= DAV1D_ARM_CPU_FLAG_NEON; #endif return flags; }