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Message from discussion Register spilling needs a last-gasp give-up scheme
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Dan Sugalski  
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 More options May 25 2004, 11:20 am
Newsgroups: perl.perl6.internals
From: d...@sidhe.org (Dan Sugalski)
Date: Tue, 25 May 2004 11:20:02 -0400
Local: Tues, May 25 2004 11:20 am
Subject: Re: [perl #29837] Register spilling needs a last-gasp give-up scheme
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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


 
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