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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(HAVE_GETAUXVAL) || defined(HAVE_ELF_AUX_INFO)
#include <sys/auxv.h>
#if ARCH_AARCH64
#define HWCAP_AARCH64_ASIMDDP (1 << 20)
#define HWCAP_AARCH64_SVE (1 << 22)
#define HWCAP2_AARCH64_SVE2 (1 << 1)
#define HWCAP2_AARCH64_I8MM (1 << 13)
COLD unsigned dav1d_get_cpu_flags_arm(void) {
#ifdef HAVE_GETAUXVAL
unsigned long hw_cap = getauxval(AT_HWCAP);
unsigned long hw_cap2 = getauxval(AT_HWCAP2);
#else
unsigned long hw_cap = 0;
unsigned long hw_cap2 = 0;
elf_aux_info(AT_HWCAP, &hw_cap, sizeof(hw_cap));
elf_aux_info(AT_HWCAP2, &hw_cap2, sizeof(hw_cap2));
#endif
unsigned flags = DAV1D_ARM_CPU_FLAG_NEON;
flags |= (hw_cap & HWCAP_AARCH64_ASIMDDP) ? DAV1D_ARM_CPU_FLAG_DOTPROD : 0;
flags |= (hw_cap2 & HWCAP2_AARCH64_I8MM) ? DAV1D_ARM_CPU_FLAG_I8MM : 0;
flags |= (hw_cap & HWCAP_AARCH64_SVE) ? DAV1D_ARM_CPU_FLAG_SVE : 0;
flags |= (hw_cap2 & HWCAP2_AARCH64_SVE2) ? DAV1D_ARM_CPU_FLAG_SVE2 : 0;
return flags;
}
#else /* !ARCH_AARCH64 */
#ifndef HWCAP_ARM_NEON
#define HWCAP_ARM_NEON (1 << 12)
#endif
#define HWCAP_ARM_ASIMDDP (1 << 24)
#define HWCAP_ARM_I8MM (1 << 27)
COLD unsigned dav1d_get_cpu_flags_arm(void) {
#ifdef HAVE_GETAUXVAL
unsigned long hw_cap = getauxval(AT_HWCAP);
#else
unsigned long hw_cap = 0;
elf_aux_info(AT_HWCAP, &hw_cap, sizeof(hw_cap));
#endif
unsigned flags = (hw_cap & HWCAP_ARM_NEON) ? DAV1D_ARM_CPU_FLAG_NEON : 0;
flags |= (hw_cap & HWCAP_ARM_ASIMDDP) ? DAV1D_ARM_CPU_FLAG_DOTPROD : 0;
flags |= (hw_cap & HWCAP_ARM_I8MM) ? DAV1D_ARM_CPU_FLAG_I8MM : 0;
return flags;
}
#endif /* ARCH_AARCH64 */
#elif defined(__APPLE__)
#include <sys/sysctl.h>
static int have_feature(const char *feature) {
int supported = 0;
size_t size = sizeof(supported);
if (sysctlbyname(feature, &supported, &size, NULL, 0) != 0) {
return 0;
}
return supported;
}
COLD unsigned dav1d_get_cpu_flags_arm(void) {
unsigned flags = DAV1D_ARM_CPU_FLAG_NEON;
if (have_feature("hw.optional.arm.FEAT_DotProd"))
flags |= DAV1D_ARM_CPU_FLAG_DOTPROD;
if (have_feature("hw.optional.arm.FEAT_I8MM"))
flags |= DAV1D_ARM_CPU_FLAG_I8MM;
/* No SVE and SVE2 feature detection available on Apple platforms. */
return flags;
}
#elif defined(_WIN32)
#include <windows.h>
COLD unsigned dav1d_get_cpu_flags_arm(void) {
unsigned flags = DAV1D_ARM_CPU_FLAG_NEON;
#ifdef PF_ARM_V82_DP_INSTRUCTIONS_AVAILABLE
if (IsProcessorFeaturePresent(PF_ARM_V82_DP_INSTRUCTIONS_AVAILABLE))
flags |= DAV1D_ARM_CPU_FLAG_DOTPROD;
#endif
/* No I8MM or SVE feature detection available on Windows at the time of
* writing. */
return flags;
}
#elif defined(__ANDROID__)
#include <ctype.h>
#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;
size_t flaglen = strlen(flag);
while ((line = fgets(line_buffer, sizeof(line_buffer), file))) {
// check all occurances as whole words
const char *found = line;
while ((found = strstr(found, flag))) {
if ((found == line_buffer || !isgraph(found[-1])) &&
(isspace(found[flaglen]) || feof(file))) {
fclose(file);
return 1;
}
found += flaglen;
}
// if line is incomplete seek back to avoid splitting the search
// string into two buffers
if (!strchr(line, '\n') && strlen(line) > flaglen) {
// 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, -flaglen, SEEK_CUR))
break;
}
}
fclose(file);
return 0;
}
COLD unsigned dav1d_get_cpu_flags_arm(void) {
unsigned flags = parse_proc_cpuinfo("neon") ? DAV1D_ARM_CPU_FLAG_NEON : 0;
flags |= parse_proc_cpuinfo("asimd") ? DAV1D_ARM_CPU_FLAG_NEON : 0;
flags |= parse_proc_cpuinfo("asimddp") ? DAV1D_ARM_CPU_FLAG_DOTPROD : 0;
flags |= parse_proc_cpuinfo("i8mm") ? DAV1D_ARM_CPU_FLAG_I8MM : 0;
#if ARCH_AARCH64
flags |= parse_proc_cpuinfo("sve") ? DAV1D_ARM_CPU_FLAG_SVE : 0;
flags |= parse_proc_cpuinfo("sve2") ? DAV1D_ARM_CPU_FLAG_SVE2 : 0;
#endif /* ARCH_AARCH64 */
return flags;
}
#else /* Unsupported OS */
COLD unsigned dav1d_get_cpu_flags_arm(void) {
return 0;
}
#endif