> -----Original Message-----
> From:
> [email protected]
> [mailto:avr-libc-dev-bounces+eweddington=cso.atmel....@nongnu.
> org] On Behalf Of Joerg Wunsch
> Sent: Friday, February 06, 2009 4:22 PM
> To: [email protected]
> Subject: Re: [avr-libc-dev] [RFC] Sleeping BOD API
>
> If you feel your version is safe, go ahead, but I've
> got the impression you weren't so confident about its safety, so that
> that triggered your question in the first place.
Well I was hoping that someone (perhaps Anatoly, or Denis or Marek [if they
ever read this list anymore]) would know if GCC knows about the "liveness" of
MCUCR in the register, since it chose the instruction in between the two
__asm__ statements, i.e. I want to make sure that with the macro, gcc won't do
something weird like:
in r24,85-32
/* #APP */
; 61 "test.c" 1
ori r24,96
; 0 "" 2
/* #NOAPP */
out 85-32,r24
/* #APP */
; 61 "test.c" 1
andi r25,-33
; 0 "" 2
/* #NOAPP */
out 85-32,r25
where it chooses a different register for the second __asm__ statement and that
different register has basically invalid data.
Eric
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