[RFC] Port libitm to powerpc

[Iain Sandoe]

On 1 Dec 2011, at 01:05, Richard Henderson wrote:

> No support for non-ELF, aka AIX

> and Darwin.   I'm not 100% sure how to handle the assembly markup  
> for those, and I couldn't test it anyway.  Again, I'd prefer someone  
> else figure that stuff out.

I've started to take a look at Darwin [sjlj.S] - and I have a feeling  
that it's going to be nearly 'change every line' - (our asm syntax is  
ancient) -
so probably, in this case, better to have a separate file (but will  
try to get to a working version before making that judgement finally).

I presume that w should treat this as a normal prologue - and it looks  
very much like "save the world" - so I have a question:

is there any reason that we should avoid using out-of-line saves in  
this specific case?

thanks
Iain