> -----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 Weddington, Eric > Sent: Friday, February 12, 2010 11:49 PM > To: Soren Jorvang; Joerg Wunsch; avr-libc-dev@nongnu.org > Subject: RE: [avr-libc-dev] [bug #28881] nop() macro for NOP > instruction > > > > > -----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: Friday, February 12, 2010 5:35 PM > > To: Soren Jorvang; Joerg Wunsch; avr-libc-dev@nongnu.org > > Subject: [avr-libc-dev] [bug #28881] nop() macro for NOP instruction > > > > > > Follow-up Comment #1, bug #28881 (project avr-libc): > > > > You guessed it: there's no real place for the nop() macro > > to go into. That's the main reason it's not yet there. > > > > I agree that there is not a convenient place to put such a > macro. But I would also argue now that we do not need to have > such a macro in avr-libc. The only use for the NOP > instruction is for some sort of delay, typically by a > specific number of cycles. This has been available via > patches to GCC for a while now. These patches add intrinsic > functions to the AVR port of GCC and one of those intrinsic > functions allows the user to delay a specified number of > cycles. GCC will then generate inline code to do this which > takes advantage of NOP and other instructions to implement > this. These patches are included in the WinAVR release, and > should be available in other distributions, though I haven't > checked on other platforms.
Oh, I also wanted to add that these patches *will* make their way upstream into the GCC source code, but it's a process to get it done. I don't have an exact time frame for this yet. _______________________________________________ AVR-libc-dev mailing list AVR-libc-dev@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-libc-dev
