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

Signed-off-by: Brad Smith <brad@comstyle.com>
This commit is contained in:
Brad Smith 2024-06-22 22:49:14 -04:00
parent 23531c9776
commit 41190da9e1
1 changed files with 38 additions and 0 deletions
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38
libavutil/aarch64/cpu.c
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@ -65,6 +65,44 @@ static int detect_flags(void)
return flags;
}
#elif defined(__OpenBSD__)
#include <machine/armreg.h>
#include <machine/cpu.h>
#include <sys/types.h>
#include <sys/sysctl.h>
static int detect_flags(void)
{
int flags = 0;
#ifdef CPU_ID_AA64ISAR0
int mib[2];
uint64_t isar0;
uint64_t isar1;
size_t len;
mib[0] = CTL_MACHDEP;
mib[1] = CPU_ID_AA64ISAR0;
len = sizeof(isar0);
if (sysctl(mib, 2, &isar0, &len, NULL, 0) != -1) {
if (ID_AA64ISAR0_DP(isar0) >= ID_AA64ISAR0_DP_IMPL)
flags |= AV_CPU_FLAG_DOTPROD;
}
mib[0] = CTL_MACHDEP;
mib[1] = CPU_ID_AA64ISAR1;
len = sizeof(isar1);
if (sysctl(mib, 2, &isar1, &len, NULL, 0) != -1) {
#ifdef ID_AA64ISAR1_I8MM_IMPL
if (ID_AA64ISAR1_I8MM(isar1) >= ID_AA64ISAR1_I8MM_IMPL)
flags |= AV_CPU_FLAG_I8MM;
#endif
}
#endif
return flags;
}
#elif defined(_WIN32)
#include <windows.h>