add comment on use of tpidrro_el0 on macOS
@@ -707,7 +707,7 @@ static inline void* mi_tls_slot(size_t slot) mi_attr_noexcept {
res = tcb[slot];
#elif defined(__aarch64__)
void** tcb; UNUSED(ofs);
-#if defined(__APPLE__)
+#if defined(__APPLE__) // issue #343
__asm__ volatile ("mrs %0, tpidrro_el0" : "=r" (tcb));
#else
__asm__ volatile ("mrs %0, tpidr_el0" : "=r" (tcb));
@@ -734,7 +734,7 @@ static inline void mi_tls_slot_set(size_t slot, void* value) mi_attr_noexcept {
tcb[slot] = value;
#elif defined(__aarch64__)
void** tcb; UNUSED(ofs);
-#if defined(__APPLE__)
+#if defined(__APPLE__) // issue #343
__asm__ volatile ("mrs %0, tpidrro_el0" : "=r" (tcb));
#else
__asm__ volatile ("mrs %0, tpidr_el0" : "=r" (tcb));
