> -----Original Message----- > From: > avr-libc-dev-bounces+eric.weddington=atmel....@nongnu.org > [mailto:avr-libc-dev-bounces+eric.weddington=atmel....@nongnu. > org] On Behalf Of Joerg Wunsch > Sent: Monday, March 23, 2009 4:27 PM > To: avr-libc-dev@nongnu.org > Subject: Re: [avr-libc-dev] Inline assembler and compiler optimization > > As Weddington, Eric wrote: > > > > Likewise, the same goes for using nop(), as tempting as it is. > > > Again, _NOP() would be fine, as will __nop(). > > > Hmm. I think that might be included as part of the new builtins for > > the AVR port. > > I don't think there's a reason to have that as a builtin, when it can > be so conveniently had as an inline asm statement. That's much > different from __delay_cycles.
There is already a precedent. There are other instructions that are added as builtins: sei, cli, wdr, sleep, swap, fmul*. The AVR32 port has many more. And other GCC ports (IIRC e.g. ARM) seem to include every instruction as a builtin. I just checked the builtin patch, nop needs to be added to the list (but there is an implementation of it that is used for the delay_cycles). > Well, it would rather be <avr/nojtag.h> :). Rather something like > <avr/mcufeatures.h> or such. After all, it's about MCUCR/MCUCSR. How about <avr/mcu.h> then? That's fairly short and easy to remember. _______________________________________________ AVR-libc-dev mailing list AVR-libc-dev@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-libc-dev
