[v3] atomics

[David Daney]

David Daney wrote:
> Jakub Jelinek wrote:
>> On Fri, Apr 18, 2008 at 10:51:33AM -0700, David Daney wrote:
>>> At this point I don't really have an opinion as to how to fix the 
>>> problem.  One thought that comes to mind is to change the definition 
>>> of atomic_flag so that the size of the atomic variable is appropriate 
>>> for the target architecture (32 bits in the case of MIPS)
>>
>> Best is to add support for the 8 and 16-bit sync builtins.
>> See e.g. sparc or s390 backends how it can be done using 32-bit
>> compare and swap instruction.
>>
> 
> Thanks Jakub,
> 
> Would it make sense to handle this in a more generic manner where the 
> operations are expanded?

Well, that's not likely to work...

> Or should each target just write patterns for 
> 8 and 16 bit operations if they don't natively support it?

I will do this for MIPS.

Thanks,
David Daney