Re: [avr-gcc-list] >4.5.1 better than this at register-structure (xmega) access?

[Erik Walthinsen]

On 10/10/2012 01:43 PM, Georg-Johann Lay wrote:
> Such a bug has never been reported to the GCC bug tracker.
Well then, I guess I need to file one.  I just have no idea how to 
actually fix it, and no time to do so at this point ;-(

> If nobody found it important enough to file a problem report for over 3
> years (4.5 was released early 2009) I'd guess this is simply not an
> important issue?
It's not a bug per se but a missing optimization, so it's entirely 
possible nobody's cared enough to check.  I'm a) doing some extremely 
time-critical ISR routines, and b) trying to actually make use of the 
struct convenience.

> There is PR50448 which is similar but different and fixed for 4.7.0.
Yeah, doesn't look like the same issue at all.

> Xmega is supported in avr-gcc since 4.7.0 (PR52261) so you obviously use
> some private port with its own, private bug tracker.
No, I'm using a version that matched the latest toolchain source I could 
get from Atmel at the time (6-12mo ago?) and took their patches 
including Xmega, which didn't include any more than the 64a1u, 128a1u, 
and 256a3bu.  I had to go through *all* the toolchain to add in the rest 
of the parts that are available from Digikey.

So, I guess I'll ask again: where do I actually get TODAY's toolchain? 
I keep reading about how Atmel takes forever to release the patches to 
the toolchain they ship, yet they now seem to be the "only" official 
toolchain, and nobody else appears to be actually maintaining patches 
separately.  Unless the GCC core is actually being kept up now and 
nobody bothered to mention it, but I just downloaded 4.7.2 and found the 
exact same set of parts missing.