RE: [avr-gcc-list] Suspect optimizer missed code in avr-gcc 4.4.3..

[Weddington, Eric]

> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> org] On Behalf Of uhmgawa
> Sent: Tuesday, February 16, 2010 6:38 AM
> To: address@hidden
> Subject: [avr-gcc-list] Suspect optimizer missed code in 
> avr-gcc 4.4.3..
> 
> I've seen some similar bug reports but not specifically
> related to a bitwise-and operation where more than one
> set bit exists in the constant operand.  Note if the
> constant '3' is replaced with an 'unsigned char'
> variable of the same value, the expected minimal
> code sequence results (sans the fetch of the added
> variable from memory).

Here is a list of known AVR GCC bug reports:
<http://www.nongnu.org/avr-libc/bugs.html>
Please note the ones marked as "missed optimization". See if your bug fits one 
of those. If not, then please submit a bug report to the GCC project.