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/*
* 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;
}
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