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Date: Tue, 25 May 2004 11:20:02 -0400
To: l...@toetsch.at
Subject: Re: [perl #29837] Register spilling needs a last-gasp give-up
 scheme
Cc: perl6-intern...@perl.org
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From: d...@sidhe.org (Dan Sugalski)

At 4:29 PM +0200 5/25/04, Leopold Toetsch wrote:
>Dan Sugalski <d...@sidhe.org> wrote:
>
>>  I can see that helping in some circumstances (though not mine) but
>>  the code that the register allocator's having fits with has no .local
>>  declarations at all. It's all $x register usage from beginning to end.
>
>Don't you have something like variables, which could be stored as
>globals?
>
>If you code looked like ...
>
>   $Px = global "foo"
>   # some temps
>   $Px += temp
>
>... it would automatically cut down the life range of $Px.

Yes, I know. I've done that. Everything is in globals, everything is 
fetched only when actually needed, and only lives for the duration of 
the basic block. (The compiler keeps a cache and flushes it every 
label)

>One more remark: do you use the same "$Px" in different places (for
>different temps/vars) or do you increase "x" for different temps? The
>latter should be much better.

I do the latter. There's no reuse of the $Px temps for different values.
-- 
                                         Dan

--------------------------------------"it's like this"-------------------
Dan Sugalski                          even samurai
d...@sidhe.org                         have teddy bears and even
                                       teddy bears get drunk