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kalambong

Joined: 08 Nov 2008
Posts: 165

kalambong 22 Apr 2009, 02:37

Read an article about OCG (Omniscient Code Generation) and get pretty impressed, so I'll post just one question here ---

What it takes to implement OCG (or similar technique) for FASM?

More info on OCG can be found at the below addresses:

http://www.industrial-embedded.com/articles/id/?3030

http://gaubuali.wordpress.com/2008/10/23/compilation-strategies-for-the-pic32

.... or you can simply google for "Omniscient Code Generation".

Thank you !

22 Apr 2009, 02:37

Goplat

Joined: 15 Sep 2006
Posts: 181

Goplat 22 Apr 2009, 02:54

FASM is just an assembler, not a compiler, so it's up to the programmer to be omniscient Smile

22 Apr 2009, 02:54

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 19869
Location: In your JS exploiting you and your system

revolution 22 Apr 2009, 08:39

kalambong wrote:

What it takes to implement OCG (or similar technique) for FASM?

It would probably be possible to have automatic register usage generation.

Code:

proc MyProc uses reg1 reg2, parameter1, ...

So perhaps we could eliminate the uses clause with some complicated set of macros or internally alter the source code. This would fix you to a particular calling convention though.

Perhaps also automatic structure alignment and reordering.

Code:

struc MyStruc {
 .x db ?
 .y dw ?
 .z dd ?
}

We could apply two different "optimisations" that that. First we could automatically reorder it to get all members aligned (.z, .y then .x) or secondly we could automatically insert padding to get the wanted alignment. But again it assumes a particular usage model.

Probably lots of other things we could do.

22 Apr 2009, 08:39

kalambong

Joined: 08 Nov 2008
Posts: 165

kalambong 23 Apr 2009, 05:13

It's perfectly okay by me if you guys want to put the OCG idea in the back burner for now, for 1.68 has just been released.

But it would be superbly wonderful if FASM gets some OCG-type of enhancements in 1.69.x. Smile

Thanks all !

23 Apr 2009, 05:13

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 19869
Location: In your JS exploiting you and your system

revolution 23 Apr 2009, 05:16

kalambong wrote:

for 1.68 has just been released.

You are the second person to say that, but where is the release?

23 Apr 2009, 05:16

pal

Joined: 26 Aug 2008
Posts: 227

pal 23 Apr 2009, 07:21

1.68 has been released? I can only find 1.67.38 anywhere...

23 Apr 2009, 07:21

Azu

Joined: 16 Dec 2008
Posts: 1159

Azu 23 Apr 2009, 16:06

pal wrote:

1.68 has been released? I can only find 1.67.38 anywhere...

Same here, Anyone have a link to the download?

23 Apr 2009, 16:06

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