[M3commit] CVS Update: cm3

[Jay K]

Unclear. I've also worked very hard at this and I believe it is in better shape than before.
Granted, some steps forward, some backward. But I think much more forward.
 
I'm using -O3.
Sometimes what I do is in parse.c I explicitly enable everything but setting all the flags.
  We should perhaps do that anyway, esp. for optimizations that don't take long and don't hurt debugging.
 
 
I suspect these two bugs were present back then, you just didn't hit them because:
  1) we didn't have the unused nested function? 
  2) we didn't have cvsup? 
 
 
I disabled very very little.
In trade, we don't throw around volatile all over the place.
 
 
I think if you look into it, things were broken back then just the same.
But we didn't have the code to tickle the bugs.
 
 
I would like to get back "unit at a time". That seems a good optimization wrt inlining and it is being disabled for something that should be easily fixable some other way.
 
 
vrp/fre/pre I don't know.
It'll take quite some debugging to fix those.
vrp produces bad code.
fre and/or pre crash in the compiler.
 
 
I'd also like to fix the volatile float problem. I've worked on that quite a bit too.
I tried to make loophole always go through a volatile temporary for example.
I tried making loophole go through a union.
No luck yet.
I guess I should see what:
  int a; 
  float j;   
  a = *(int*)&j;  
 
 
does in C.
 
 
Notice that some of this is in the release branch. Where all I've done is test more code.
I didn't remove the volatility on all load/store for example.
 
 
 - Jay


________________________________
> From: hosking at cs.purdue.edu
> Date: Fri, 4 Jun 2010 12:36:24 -0400
> To: jkrell at elego.de
> CC: m3commit at elegosoft.com
> Subject: Re: [M3commit] CVS Update: cm3
>
>
>
> Are you planning to go through and fix things so we can re-enable optimisations?
>
> I worked pretty hard to get everything to compile with -O2/-O3 when I worked on this with the current m3cg.
>
>
> Antony Hosking | Associate Professor | Computer Science | Purdue University
> 305 N. University Street | West Lafayette | IN 47907 | USA
> Office +1 765 494 6001 | Mobile +1 765 427 5484
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>
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>
> On 4 Jun 2010, at 18:15, Jay Krell wrote:
>
> CVSROOT: /usr/cvs
> Changes by: jkrell at birch. 10/06/04 18:15:09
>
> Modified files:
> cm3/m3-sys/m3cc/gcc/gcc/m3cg/: Tag: release_branch_cm3_5_8
> parse.c
>
> Log message:
> turn off "pre" optimization, which crashes compiling
> m3-tools/cvsup/server/FSServer.m3
>