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[88.192.28.243]) by smtp.gmail.com with ESMTPSA id y26-20020a2e321a000000b002a77e01c3a1sm2836760ljy.22.2023.05.30.05.30.46 for (version=TLS1 cipher=AES128-SHA bits=128/128); Tue, 30 May 2023 05:30:46 -0700 (PDT) From: =?utf-8?q?Martin_Storsj=C3=B6?= To: ffmpeg-devel@ffmpeg.org Date: Tue, 30 May 2023 15:30:42 +0300 Message-Id: <20230530123043.52940-4-martin@martin.st> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) In-Reply-To: <20230530123043.52940-1-martin@martin.st> References: <20230530123043.52940-1-martin@martin.st> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH v2 4/5] aarch64: Add Apple runtime detection of dotprod and i8mm using sysctl X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" X-TUID: YPxeqJ/NBnKZ For now, there's not much value in this since Clang don't support enabling the dotprod or i8mm features with either .arch_extension or .arch (it has to be enabled by the base arch flags passed to the compiler). But it may be supported in the future. --- configure | 2 ++ libavutil/aarch64/cpu.c | 22 ++++++++++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/configure b/configure index b39de74de5..001287c169 100755 --- a/configure +++ b/configure @@ -2348,6 +2348,7 @@ SYSTEM_FUNCS=" strerror_r sysconf sysctl + sysctlbyname usleep UTGetOSTypeFromString VirtualAlloc @@ -6394,6 +6395,7 @@ check_func_headers mach/mach_time.h mach_absolute_time check_func_headers stdlib.h getenv check_func_headers sys/stat.h lstat check_func_headers sys/auxv.h getauxval +check_func_headers sys/sysctl.h sysctlbyname check_func_headers windows.h GetModuleHandle check_func_headers windows.h GetProcessAffinityMask diff --git a/libavutil/aarch64/cpu.c b/libavutil/aarch64/cpu.c index 4563959ffd..ffb00f6dd2 100644 --- a/libavutil/aarch64/cpu.c +++ b/libavutil/aarch64/cpu.c @@ -72,6 +72,28 @@ static int detect_flags(void) return flags; } +#elif defined(__APPLE__) && HAVE_SYSCTLBYNAME +#include + +static int detect_flags(void) +{ + uint32_t value = 0; + size_t size; + int flags = 0; + + size = sizeof(value); + if (!sysctlbyname("hw.optional.arm.FEAT_DotProd", &value, &size, NULL, 0)) { + if (value) + flags |= AV_CPU_FLAG_DOTPROD; + } + size = sizeof(value); + if (!sysctlbyname("hw.optional.arm.FEAT_I8MM", &value, &size, NULL, 0)) { + if (value) + flags |= AV_CPU_FLAG_I8MM; + } + return flags; +} + #else static int detect_flags(void)