Re: [Nasm-devel] adding AVX2 transactional synchronization extensions

[H. P. A. <hp...@zy...>]

On 02/14/2012 02:24 PM, Cyrill Gorcunov wrote:
>>
>> IIRC MOV never requires LOCK, nor does it accept it.
>>
>
> quoting spec:
> The XRELEASE prefix hint can only be used with the following instructions:
>
>   - The "MOV mem, reg" (Opcode 88H/89H) and "MOV mem, imm" (Opcode C6H/C7H) instructions.
>     In these cases, the XRELEASE is recognized without the presence of the LOCK
>     prefix.
>
> So I seem to miss something obvious?
>

Not really... it's what it says up there... doesn't require a LOCK 
prefix.  Note that only some form of MOV is supported, which is another 
reason this needs to be part of the instruction pattern in insns.dat.

	-hpa