[Patch,AVR]: Fix PR50449

[Weddington, Eric]

> -----Original Message-----
> From: Georg-Johann Lay [mailto:avr@gjlay.de]
> Sent: Tuesday, September 20, 2011 12:28 PM
> To: gcc-patches@gcc.gnu.org
> Cc: Weddington, Eric; Anatoly Sokolov; Denis Chertykov
> Subject: [Patch,AVR]: Fix PR50449
> 
> This is fix for a minor performance regression introduced by my changes in
> trunk r175956: To load a 32-bit constant like 1 into R2, 4.6 uses
> 
>      CLR  R2
>      CLR  R3
>      MOVW R4,R2
>      INC  R2
> 
> whereas trunk prints the longer
> 
>      CLR  R2
>      INC  R2
>      CLR  R3
>      CLR  R4
>      CLR  R5
> 
> This patch fixes it.  The insns affected (*reload_insi and *reload_insf)
> whose
> instruction length must be adjusted now use an insn attribute to express
> how
> the adjustment has to be performed.
> 
> 
> Tested without regressions.
> 
> Ok to commit?
> 

Please commit.

Eric