RE: [avr-gcc-list] invalid use of reg_unused_after in avr.c

[Weddington, Eric]

> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> org] On Behalf Of Tristan Gingold
> Sent: Tuesday, December 02, 2008 2:12 AM
> To: address@hidden
> Subject: [avr-gcc-list] invalid use of reg_unused_after in avr.c
> 
> Hi,
> 
> while trying to understand why gcc generates buggy code, I 
> wondered if  
> it is safe to use reg_unused_after
> (and more particularly dead_or_set_p) while emitting asm.
<snip> 
> AVR seems to be the only target to use dead_or_set_p so late.  Other  
> targets use peephole optimizations
> to address such cases.
> 
> Thoughts ?

Hi Tristan,

Unfortunately, there are not many people here who both work on the AVR port and 
are familiar with GCC internals.

If you are looking at HEAD/4.4, then FYI, I have a general concern regarding 
the state of the AVR port with IRA. AVR GCC will build, but no one has really 
tested how the code generation is with IRA. There could easily be lurking 
problems in 4.4.

If you think that something should be changed in the AVR port back-end, then 
please send patches! :-) We're definitely open to getting things fixed.

Eric Weddington