[PATCH, i386] RTM support

[Patrick Marlier]

On 02/21/2012 02:52 AM, Uros Bizjak wrote:
> On Tue, Feb 21, 2012 at 12:26 AM, Andi Kleen<andi@firstfloor.org>  wrote:
>>> IIUC the documentation, the fallback label is a parameter to xbegin
>>> insn, but the insn itself doesn't jump anywhere - it just records the
>>
>>  From the point of view of the program XBEGIN behaves like a conditional
>> jump (with a very complicated and unpredictable condition)
>
> Yes, but as it is written ATM, it conditionally jumps to the next insn.
>
> BTW: Looking a bit more to the spec, we can simply write
>
> xbegin $0
>
> as the spec says that offset is relative to the _NEXT_ instruction.

AFAIU, the current binutils 'as' expects a label not an offset. So 
"xbegin 0" means fallback at label 0.
--
Patrick