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132 lines
3.4 KiB
132 lines
3.4 KiB
/* |
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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 && HAVE_ASM_HWCAP_H |
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#include <stdint.h> |
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#include <asm/hwcap.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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unsigned long hwcap; |
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hwcap = getauxval(AT_HWCAP); |
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#if defined(HWCAP_CPUID) |
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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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#else |
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(void)hwcap; |
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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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