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Re: [avr-gcc-list] avr-gcc bug

From: Klaus Rotter
Subject: Re: [avr-gcc-list] avr-gcc bug
Date: Sun, 22 Apr 2001 11:56:33 +0200
User-agent: Mutt/1.2.5i

On Sat, Apr 21, 2001 at 12:41:10PM -0300, Francisco T. A. Silva wrote:
> int main(void)
> {
>     unsigned int i;
>     for(i = 31533; i > 0; i--);
> }

I can verify this with an older version of avr-gcc
(gcc version 2.97 20010108 (experimental)). A much older version of avr-gcc
(2.95.2) behaves like you expected. If you want dead loops (e.g. for delay
lines), a possible solution may be to use volatile variables:

int main(void)
    volatile unsigned int i;
    for(i = 31533; i > 0; i--);
      > avr-gcc-list mailing list

Then you get what you expect (even with -O3):

avr-gcc -O3 -S t.c 

        ldi r24,lo8(31533)
        ldi r25,hi8(31533)
        std Y+1,r24
        std Y+2,r25
        sbiw r24,3        
        brne .L5

 Klaus Rotter * address@hidden

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