mirror of
https://git.ffmpeg.org/ffmpeg.git
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128 lines
3.4 KiB
C
128 lines
3.4 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 get_cpu_feature_reg(reg, val) \
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__asm__("mrs %0, " #reg : "=r" (val))
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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 defined(HWCAP_CPUID) && HAVE_INLINE_ASM
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unsigned long hwcap = getauxval(AT_HWCAP);
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// We can check for DOTPROD and I8MM using HWCAP_ASIMDDP and
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// HWCAP2_I8MM too, avoiding to read the CPUID registers (which triggers
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// a trap, handled by the kernel). However the HWCAP_* defines for these
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// extensions are added much later than HWCAP_CPUID, so the userland
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// headers might lack support for them even if the binary later is run
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// on hardware that does support it (and where the kernel might support
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// HWCAP_CPUID).
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// See https://www.kernel.org/doc/html/latest/arm64/cpu-feature-registers.html
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if (hwcap & HWCAP_CPUID) {
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uint64_t tmp;
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get_cpu_feature_reg(ID_AA64ISAR0_EL1, tmp);
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if (((tmp >> 44) & 0xf) == 0x1)
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flags |= AV_CPU_FLAG_DOTPROD;
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get_cpu_feature_reg(ID_AA64ISAR1_EL1, tmp);
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if (((tmp >> 52) & 0xf) == 0x1)
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flags |= AV_CPU_FLAG_I8MM;
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}
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#endif
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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 detect_flags(void)
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{
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uint32_t value = 0;
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size_t size;
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int flags = 0;
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size = sizeof(value);
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if (!sysctlbyname("hw.optional.arm.FEAT_DotProd", &value, &size, NULL, 0)) {
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if (value)
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flags |= AV_CPU_FLAG_DOTPROD;
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}
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size = sizeof(value);
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if (!sysctlbyname("hw.optional.arm.FEAT_I8MM", &value, &size, NULL, 0)) {
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if (value)
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flags |= AV_CPU_FLAG_I8MM;
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}
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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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