Function std::intrinsics::atomic_xadd_relaxed

pub unsafe extern "rust-intrinsic" fn atomic_xadd_relaxed<T>(    dst: *mut T,     src: T) -> T where    T: Copy,

???? This is a nightly-only experimental API. (core_intrinsics)

intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library

Adds to the current value, returning the previous value.

The stabilized version of this intrinsic is available on the atomic types via the fetch_add method by passing Ordering::Relaxed as the order. For example, AtomicIsize::fetch_add.

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Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/intrinsics/fn.atomic_xadd_relaxed.html