Re: [PATCH 24/26] tcg: Introduce tcg_temp_ebb_new_*

[Richard Henderson]

On 12/1/22 11:13, Alex Bennée wrote:
> > I'm not sure I want to take this anymore.  It's confusing to use.  I
> > really think what I should do instead is improve the TCG register
> > allocator.
>
> Whats the ultimate aim for the rewrite? Hold values in target registers
> over the extended block? What about avoid spills between potential fault
> points?

Primary goal is to handle register allocation across basic blocks without front end 
translators needing to consider "local" vs "temporary".  Which would also allow any use of 
branches in the middle-end, where we currently have to worry about accidentally killing 
temporaries held by the front end.  That's where this patch fails, in that it makes the 
current situation even more complicated.

Secondary goal would be proper register allocation across basic blocks.

Tertiary goal would be single-assignment form, to allow better optimizations.

I'll have to do some research before committing to do anything in this area.


r~