Re: [avr-gcc-list] efficiency of assigning bits

[E. Weddington]

E. Weddington wrote:

> Royce & Sharal Pereira wrote:
>
> > > So would it be a good idea (for saving uC time) to convert that 
> > > above  line to this:
> > >
> > > PORTD = (PORTD & (unsigned char)~(_BV(0))) | (unsigned  
> > > char)_BV(1)|_BV(2)|_BV(3));
> >
> >
> >
> > Whew! What a long winded way to do things! This takes less 
> > time/energy to  enter:
> >
> > PORTD &= ~(1 | (1<<1) | (1<<2));
> 1. What you wrote above is different than what was written above. 
> Follow the parentheses carefully to understand why.
More to the point, there's a slight parentheses bug in the line that is 
written above. It should be this:

PORTD = (PORTD & (unsigned char)~(_BV(0))) | (unsigned  
char)_BV(1)|_BV(2)|_BV(3);