[Bug target/50910] [avr] inefficient division by 2

[gjl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50910

--- Comment #1 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-11-01 
14:10:23 UTC ---
Author: gjl
Date: Tue Nov  1 14:10:13 2011
New Revision: 180739

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=180739
Log:
    PR target/50910
    * config/avr/avr.opt (-mbranch-cost=): New option.
    * config/avr/avr.h (BRANCH_COST): Define to avr_branch_cost.
    * config/avr/avr.c (avr_rtx_costs_1): Adjust [U]DIV/[U]MOD costs.
    * config/avr/avr.md (*addqi3.lt0, *addhi3.lt0, *addsi3.lt0): New insns.
    (*addhi3_zero_extend1): Remov % in constraint of operand 1.
    (*addhi3.sign_extend1, *subhi3.sign_extend2): New insns.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/avr/avr.c
    trunk/gcc/config/avr/avr.h
    trunk/gcc/config/avr/avr.md
    trunk/gcc/config/avr/avr.opt