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Re: [avr-gcc-list] Inline vs. ? : operator

From: Joerg Wunsch
Subject: Re: [avr-gcc-list] Inline vs. ? : operator
Date: Sat, 27 Mar 2010 18:11:11 +0100 (MET)

Szikra Istvan <address@hidden> wrote:

> /**
> Category: optimization miss

No, I think that even qualifies as a genuine bug: in your case, a
pointer qualified as "volatile" is being fetched twice, first by the
CBI instruction, and a second time by the IN instruction.  For an IO
register, this can cause unwanted side effects (e.g. fetch the next
byte from the UART).

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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