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 <sys/sysctl.h>
+
+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)
--
2.37.1 (Apple Git-137.1)
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