On 2024-06-24 4:15 a.m., Martin Storsjö wrote:
On Sat, 22 Jun 2024, Brad Smith wrote:
[PATCH] aarch64: Add OpenBSD runtime detection of dotprod and i8mm
using sysctl
Signed-off-by: Brad Smith <b...@comstyle.com>
---
libavutil/aarch64/cpu.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/libavutil/aarch64/cpu.c b/libavutil/aarch64/cpu.c
index 196bdaf6b0..40fcc8d1ff 100644
--- a/libavutil/aarch64/cpu.c
+++ b/libavutil/aarch64/cpu.c
@@ -65,6 +65,41 @@ 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;
+ 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
+ }
+
+ return flags;
+}
+
#elif defined(_WIN32)
#include <windows.h>
This LGTM. Although, in
https://code.videolan.org/videolan/dav1d/-/merge_requests/1673 you
wrapped most of this in an #ifdef CPU_ID_AA64ISAR0, so would that be
useful here too?
That would be a good idea. I will do the same. Thanks.
Feel free to push either with or without that.
// Martin
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