[Bug target/46278] avr-gcc 4.5.1 doing suboptimal reloads using X

[gjl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46278

--- Comment #6 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-10-14 
15:42:40 UTC ---
Author: gjl
Date: Fri Oct 14 15:42:33 2011
New Revision: 179993

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=179993
Log:
    PR target/46278
    * doc/invoke.texi (AVR Options): Document -mstrict-X.
    * config/avr/avr.opt (-mstrict-X): New option.
    (avr_strict_X): New variable reflecting -mstrict-X.
    * config/avr/avr.c (avr_reg_ok_for_addr_p): Add parameter
    outer_code and pass it down to avr_regno_mode_code_ok_for_base_p.
    (avr_legitimate_address_p): Pass outer_code to
    avr_reg_ok_for_addr_p and use that function in case PLUS.
    (avr_mode_code_base_reg_class): Depend on avr_strict_X.
    (avr_regno_mode_code_ok_for_base_p): Ditto, and depend on outer_code.
    (avr_option_override): Disable -fcaller-saves if -mstrict-X is on.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/avr/avr.c
    trunk/gcc/config/avr/avr.opt
    trunk/gcc/doc/invoke.texi