[Bug target/50447] [avr] Better support of AND, OR, XOR and PLUS with constant integers for 16- and 32-bit values

[gjl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50447

--- Comment #6 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-10-19 
14:59:05 UTC ---
Author: gjl
Date: Wed Oct 19 14:59:00 2011
New Revision: 180193

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=180193
Log:
    PR target/50447
    * config/avr/avr.md (cc): New alternative out_plus_noclobber.
    (adjust_len): Ditto.
    (addhi3): Don't pipe through short; use gen_int_mode instead.
    Prior to reload, expand to gen_addhi3_clobber.
    (*addhi3): Use avr_out_plus_noclobber if applicable, use
    out_plus_noclobber in cc and adjust_len attribute.
    (addhi3_clobber): 2 new RTL peepholes.
    (addhi3_clobber): New insn.
    * config/avr/avr-protos.h: (avr_out_plus_noclobber): New prototype.
    * config/avr/avr.c (avr_out_plus_noclobber): New function.
    (notice_update_cc): Handle CC_OUT_PLUS_NOCLOBBER.
    (avr_out_plus_1): Tweak if only MSB is +/-1 and other bytes are 0.
    Set cc0 to set_zn for adiw on 16-bit values.
    (adjust_insn_length): Handle ADJUST_LEN_OUT_PLUS_NOCLOBBER.
    (expand_epilogue): No need to add 0 to frame_pointer_rtx.


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