RE: [avr-gcc-list] Re: Code optimistaion in AVR Tiny13

[Weddington, Eric]

> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> org] On Behalf Of David Brown
> Sent: Monday, February 16, 2009 2:31 PM
> To: address@hidden
> Subject: [avr-gcc-list] Re: Code optimistaion in AVR Tiny13
> 
> Another important point in getting code as small as possible 
> is to use 
> -combine and -fwhole-program - it can significantly improve code, 
> especially for functions that are called only once but live 
> in different 
> modules.

In my tests on real world programs, it have decreased the code by up to 25%. 
And it has also *increased* the code by up to 25%! Unfortunately I don't know 
what about the code that causes it to increase. But clearly it is not always a 
win and can be a detriment. So be sure to check your code sizes when you use 
this.