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use __builtin_thread_pointer on arm64 with older gcc compilers (issue #851)

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Daan 2024-04-20 16:09:45 -07:00
parent f7df734c6f
commit 336f83fbd1
1 changed files with 12 additions and 1 deletions
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13
include/mimalloc/prim.h
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@ -203,12 +203,23 @@ static inline void mi_prim_tls_slot_set(size_t slot, void* value) mi_attr_noexce
#endif
// Do we have __builtin_thread_pointer? (do not make this a compound test as it fails on older gcc's, see issue #851)
#if defined(__has_builtin)
#if __has_builtin(__builtin_thread_pointer)
#define MI_HAS_BUILTIN_THREAD_POINTER 1
#endif
#elif defined(__GNUC__) && (__GNUC__ >= 7) && defined(__aarch64__) // special case aarch64 for older gcc versions (issue #851)
#define MI_HAS_BUILTIN_THREAD_POINTER 1
#endif
// defined in `init.c`; do not use these directly
extern mi_decl_thread mi_heap_t* _mi_heap_default; // default heap to allocate from
extern bool _mi_process_is_initialized; // has mi_process_init been called?
static inline mi_threadid_t _mi_prim_thread_id(void) mi_attr_noexcept;
// Get a unique id for the current thread.
#if defined(_WIN32)
#define WIN32_LEAN_AND_MEAN
@ -218,7 +229,7 @@ static inline mi_threadid_t _mi_prim_thread_id(void) mi_attr_noexcept {
return (uintptr_t)NtCurrentTeb();
}
#elif defined(__has_builtin) && __has_builtin(__builtin_thread_pointer) && \
#elif MI_HAS_BUILTIN_THREAD_POINTER && \
(!defined(__APPLE__)) && /* on apple (M1) the wrong register is read (tpidr_el0 instead of tpidrro_el0) so fall back to TLS slot assembly (<https://github.com/microsoft/mimalloc/issues/343#issuecomment-763272369>)*/ \
(!defined(__clang_major__) || __clang_major__ >= 14) // older clang versions emit bad code; fall back to using the TLS slot (<https://lore.kernel.org/linux-arm-kernel/202110280952.352F66D8@keescook/T/>)