On Thursday, February 2, 2017 at 12:03:59 AM UTC+8, T L wrote:
>
> the sync/atomic docs, https://golang.org/pkg/sync/atomic/, says in the 
> end of the docs
>
>
> On x86-32, the 64-bit functions use instructions unavailable before the 
>> Pentium MMX. 
>>
> On non-Linux ARM, the 64-bit functions use instructions unavailable before 
>> the ARMv6k core. 
>>
>> On both ARM and x86-32, it is the caller's responsibility to arrange for 
>> 64-bit alignment of 64-bit words accessed atomically. 
>>
>
Does the "ARM" here include ARMv8 (64-bit)?
 

> The first word in a global variable or in an allocated struct or slice can 
>> be relied upon to be 64-bit aligned. 
>>
>
> The last line says the first word in a global variable or in an allocated 
> struct or slice is 64-bit aligned for sure.
> But what does an allocated struct or slice means? A struct or slice 
> allocated on heap, not stack?
>

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