starred/ffmpeg-rockchip-nyanmisaka
1
0
Fork 0
mirror of https://github.com/nyanmisaka/ffmpeg-rockchip.git synced 2026-01-24 02:20:56 +01:00
Code Issues Projects Packages Wiki Activity Actions

aarch64: Add Apple runtime detection of dotprod and i8mm using sysctl

Browse source 
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.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2023-05-26 10:20:21 +03:00
parent 493fcde50a
commit 9b0052200a
2 changed files with 24 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

22
libavutil/aarch64/cpu.c
View file

@ -61,6 +61,28 @@ 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)