mirror of
https://github.com/FFmpeg/FFmpeg.git
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115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/cpu.h"
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#include "libavutil/cpu_internal.h"
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#include "config.h"
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#if (defined(__linux__) || defined(__ANDROID__)) && HAVE_GETAUXVAL
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#include <stdint.h>
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#include <sys/auxv.h>
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#define HWCAP_AARCH64_ASIMDDP (1 << 20)
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#define HWCAP2_AARCH64_I8MM (1 << 13)
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static int detect_flags(void)
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{
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int flags = 0;
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unsigned long hwcap = getauxval(AT_HWCAP);
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unsigned long hwcap2 = getauxval(AT_HWCAP2);
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if (hwcap & HWCAP_AARCH64_ASIMDDP)
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flags |= AV_CPU_FLAG_DOTPROD;
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if (hwcap2 & HWCAP2_AARCH64_I8MM)
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flags |= AV_CPU_FLAG_I8MM;
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return flags;
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}
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#elif defined(__APPLE__) && HAVE_SYSCTLBYNAME
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#include <sys/sysctl.h>
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static int have_feature(const char *feature) {
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uint32_t value = 0;
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size_t size = sizeof(value);
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if (!sysctlbyname(feature, &value, &size, NULL, 0))
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return value;
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return 0;
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}
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static int detect_flags(void)
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{
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int flags = 0;
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if (have_feature("hw.optional.arm.FEAT_DotProd"))
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flags |= AV_CPU_FLAG_DOTPROD;
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if (have_feature("hw.optional.arm.FEAT_I8MM"))
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flags |= AV_CPU_FLAG_I8MM;
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return flags;
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}
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#elif defined(_WIN32)
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#include <windows.h>
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static int detect_flags(void)
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{
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int flags = 0;
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#ifdef PF_ARM_V82_DP_INSTRUCTIONS_AVAILABLE
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if (IsProcessorFeaturePresent(PF_ARM_V82_DP_INSTRUCTIONS_AVAILABLE))
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flags |= AV_CPU_FLAG_DOTPROD;
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#endif
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return flags;
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}
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#else
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static int detect_flags(void)
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{
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return 0;
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}
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#endif
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int ff_get_cpu_flags_aarch64(void)
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{
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int flags = AV_CPU_FLAG_ARMV8 * HAVE_ARMV8 |
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AV_CPU_FLAG_NEON * HAVE_NEON;
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#ifdef __ARM_FEATURE_DOTPROD
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flags |= AV_CPU_FLAG_DOTPROD;
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#endif
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#ifdef __ARM_FEATURE_MATMUL_INT8
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flags |= AV_CPU_FLAG_I8MM;
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#endif
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flags |= detect_flags();
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return flags;
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}
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size_t ff_get_cpu_max_align_aarch64(void)
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{
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int flags = av_get_cpu_flags();
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if (flags & AV_CPU_FLAG_NEON)
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return 16;
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return 8;
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}
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