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Re: [avr-libc-dev] Re: bug #22163 (atomic not working as expectedinC++)

From: Joerg Wunsch
Subject: Re: [avr-libc-dev] Re: bug #22163 (atomic not working as expectedinC++)
Date: Wed, 9 Jun 2010 21:49:54 +0200
User-agent: Mutt/1.5.20 (2009-06-14)

As Weddington, Eric wrote:

> As a side note, wouldn't declaring some_temp_variable as volatile
> solve the issue above?

I think it does, but it's another pessimization...  It forces the
function to get a stack frame even if it otherwise doesn't need it,
and adds memory access cycles.  The optimizer could perfectly keep the
variable in a register, it's just that the developer intended to move
the time-critical routine outside the interrupt block.

cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/                        NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)

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