----- Original Message -----
From: Walter Banks <walter@bytecraft.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
Sent: Thursday, October 07, 2004 7:49 PM
Subject: Re: [PIC] new optimisation in XCSB


>
>
> Sergio Masci wrote:
>
> > Many C programmers do not realise that there is a brick wall between the C
> > pre-processor and the actual compiler. There is a certain illusion of
> > optimisation that comes from being able to expand macros into the source
code.
> > Macros are not functions and there is no function interface to get in the
way
> > when they are used.
>
> The brick wall is an illusion based on very old C compiler technology. Most
> current compilers abstract the program and then optimize. Constant folding
> strength reduction and skip or jump determination occur so much after
> parsing that the code that does these operations in unaware of the source
> structure.
>
> w..

Sorry Walter could you clarify this for me. Are you saying that C pre-processor
understands variable types and scope? Are you sure we are not talking about
different brick walls here?

Regards
Sergio Masci

http://www.xcprod.com/titan/XCSB - optimising PIC compiler



_______________________________________________
http://www.piclist.com
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist