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Re: [avr-gcc-list] suggestion

From: Royce Pereira
Subject: Re: [avr-gcc-list] suggestion
Date: Wed, 05 Jul 2006 21:08:04 +0530
User-agent: Opera Mail/9.00 (Win32)

On Wed, 05 Jul 2006 17:57:50 +0530, <address@hidden> wrote:

> I'm a total newbie to avr-gcc and just compiled a first program. It merely
> fits the program memory so I've started to optimize..
> In my code there lots of places where 1-2-3 bits are flipped in I/O port:
> My suggestion is to optimize the case when 2 bits are set into 2 sbi
> commands, and when 2 bits are cleared into 2 cbi commands. It's quite
> easy to count number of 1s or 0s in the mask - and if there are exacly
> 2, apply this optimization.

Wherever you require this, just use 2 separate bit setting/ clearing statements 
in your C code itself.


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