[Bug target/46779] [4.4/4.5/4.6 Regression][avr] wrong code generation for values held in R28/R29

[gjl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46779

--- Comment #17 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2012-05-02 17:05:10 UTC ---
Author: gjl
Date: Wed May  2 17:05:04 2012
New Revision: 187055

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=187055
Log:
    Backport from 2011-07-08 4.6-branch r176055.
    PR target/46779
    * config/avr/avr.c (avr_hard_regno_mode_ok): Rewrite.
    In particular, allow 8-bit values in r28 and r29.
    (avr_hard_regno_scratch_ok): Disallow any register that might be
    part of the frame pointer.
    (avr_hard_regno_rename_ok): Same.
    (avr_legitimate_address_p): Don't allow SUBREGs.


Modified:
    branches/gcc-4_5-branch/gcc/ChangeLog
    branches/gcc-4_5-branch/gcc/config/avr/avr.c