[PATCH v6 2/5] x86: Add SFrame support for x86 architecture

[Florian Weimer]

* Adhemerval Zanella Netto:

>>> On most architectures that supports unaligned memory operations it will be
>>> the same, however on architectures that do not the packed generates slight 
>>> better code [1] (on sparc the packed code avoids the store/load on the 
>>> temporary variable).
>> 
>> But this code is specific to x86-64, even conceptually: SPARC has 4-byte
>> instruction alignment.
>
> But if the idea is to make it generic, I think the packed version could
> work better in different architectures.  Not sure what do you mean by
> instruction alignment here (afaik the issue is sparc do not support
> unaligned data access).

Exactly.  SPARC instructions are aligned.  Any similar check would use
aligned accesses.

Thanks,
Florian