Re: [Sdcc-user] Some sdcc warnings

[Vineet G. <vin...@gm...>]

Hi there,
   My concern is this.
   For example:


  TR0 =3D 0;                    // reset the timer
  while( TR0 =3D=3D 0 );       // wait for the flag to be set.
 i++;                           // get out of the loop and increment
}

What is SDCC going to do in this case.
Will it say that line corr. to "i++" as unreachable code.

But how does the compiler know that?

Regards,
Vineet.

On 3/22/07, Jean-Paul <tch...@fr...> wrote:
>
>
>
>
> Le Mercredi 21 Mars 2007 16:15, Vineet Golchha a =E9crit:
> > Hello group,
> >   Have recently started using the SDCC compiler for 8051 controllers.
> > I found two warnings coming up when I compile the code.
> >
> > 1. warning 126 : unreachable code.
> > 2. warning 59 : conditional flow changed by optimizer.
> >
> > Queries:
> >
> > 1.Can anyone tell me what this means?
>
> 1. For example, if you write :
>
> while (1 < 0)
>         {
>                 try_this_one();
>                 ...
>         }
>
> then you'll never have a chance to try_this_one().
>
>
> > 2.Also can they be ignored?
>
> It's up to you.
>
>
> Regards
>
> Jean-Paul
>
> >
> >
> > Best Regards,
> > Vineet.
>
>
> --
> Never jump into a loop!
>
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