go/src/internal/runtime/atomic/types_64bit.go

// LoadAcquire is a partially unsynchronized version
// of Load that relaxes ordering constraints. Other threads
// may observe operations that precede this operation to
// occur after it, but no operation that occurs after it
// on this thread can be observed to occur before it.
//
// WARNING: Use sparingly and with great care.
//
//go:nosplit
func (u *Uint64) LoadAcquire() uint64 { … }

// StoreRelease is a partially unsynchronized version
// of Store that relaxes ordering constraints. Other threads
// may observe operations that occur after this operation to
// precede it, but no operation that precedes it
// on this thread can be observed to occur after it.
//
// WARNING: Use sparingly and with great care.
//
//go:nosplit
func (u *Uint64) StoreRelease(value uint64) { … }