Hello,

I would like to make sure that the following line of Go is a defined 
behavior:

 addr := (*unsafe.Pointer)((unsafe.Pointer)(&ptr))

I use it to perform atomic loads and stores to addr such as in this simple 
example: https://play.golang.org/p/DpDrRvTYMG8
It allows me not to use atomic.Value which performs two atomic operations 
and possible disable preemption (
https://golang.org/src/sync/atomic/value.go?s=1233:1269#L35).

Thanks for your help,
Julio

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