[Bug target/36467] [avr] Missed optimization with pointer arithmetic and mul*

[gjl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36467

--- Comment #6 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-07-20 
17:23:31 UTC ---
Author: gjl
Date: Wed Jul 20 17:23:28 2011
New Revision: 176527

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=176527
Log:

    PR target/36467
    PR target/49687
    * config/avr/avr.md (mulhi3): Use register_or_s9_operand for
    operand2 and expand appropriately if there is a CONST_INT in
    operand2.
    (usmulqihi3): New insn.
    (*sumulqihi3): New insn.
    (*osmulqihi3): New insn.
    (*oumulqihi3): New insn.
    (*muluqihi3.uconst): New insn_and_split.
    (*muluqihi3.sconst): New insn_and_split.
    (*mulsqihi3.sconst): New insn_and_split.
    (*mulsqihi3.uconst): New insn_and_split.
    (*mulsqihi3.oconst): New insn_and_split.
    (*ashifthi3.signx.const): New insn_and_split.
    (*ashifthi3.signx.const7): New insn_and_split.
    (*ashifthi3.zerox.const): New insn_and_split.
    (mulsqihi3): New insn.
    (muluqihi3): New insn.
    (muloqihi3): New insn.
    * config/avr/predicates.md (const_2_to_7_operand): New.
    (const_2_to_6_operand): New.
    (u8_operand): New.
    (s8_operand): New.
    (o8_operand): New.
    (s9_operand): New.
    (register_or_s9_operand): New.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/avr/avr.c
    trunk/gcc/config/avr/avr.md
    trunk/gcc/config/avr/predicates.md