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[libc] Update fence to use scoped fence now that it's supported #119018

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Merged
merged 1 commit into from
Dec 6, 2024
Merged

[libc] Update fence to use scoped fence now that it's supported #119018

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11 changes: 6 additions & 5 deletions libc/src/__support/CPP/atomic.h
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Original file line number Diff line number Diff line change
Expand Up @@ -214,11 +214,12 @@ template <typename T> struct Atomic {
};

// Issue a thread fence with the given memory ordering.
LIBC_INLINE void atomic_thread_fence([[maybe_unused]] MemoryOrder mem_ord) {
// The NVPTX backend currently does not support atomic thread fences so we use a
// full system fence instead.
#ifdef LIBC_TARGET_ARCH_IS_NVPTX
__nvvm_membar_sys();
LIBC_INLINE void atomic_thread_fence(
MemoryOrder mem_ord,
[[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) {
#if __has_builtin(__scoped_atomic_thread_fence)
__scoped_atomic_thread_fence(static_cast<int>(mem_ord),
static_cast<int>(mem_scope));
#else
__atomic_thread_fence(static_cast<int>(mem_ord));
#endif
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