================
@@ -1259,6 +1270,64 @@ struct {
// As features grows new fields could be added
} __aarch64_cpu_features __attribute__((visibility("hidden"), nocommon));
+#if defined(__APPLE__)
+#include <TargetConditionals.h>
+#if TARGET_OS_OSX || TARGET_OS_IPHONE
+#include <dispatch/dispatch.h>
+#include <sys/sysctl.h>
+
+static bool isKnownAndSupported(const char *name) {
+ int32_t val = 0;
+ size_t size = sizeof(val);
+ if (sysctlbyname(name, &val, &size, NULL, 0))
+ return false;
+ return val;
+}
+
+void __init_cpu_features_resolver(void) {
+ static dispatch_once_t onceToken = 0;
+ dispatch_once(&onceToken, ^{
----------------
MaskRay wrote:
Thanks for the explanation. If `__init_cpu_features_resolver` can be called
concurrently, I think it is worth a comment, since the other `__init_*`
functions are guaranteed to be very early in the program startup sequence and
is serial.
https://github.com/llvm/llvm-project/pull/73685
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