[Bug target/49687] [4.6 Regression][avr] Missed optimization for widening MUL

[gjl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49687

--- Comment #5 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-07-28 08:03:12 UTC ---
Author: gjl
Date: Thu Jul 28 08:03:07 2011
New Revision: 176862

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=176862
Log:

    PR target/49687
    * config/avr/t-avr (LIB1ASMFUNCS): Remove _xmulhisi3_exit.
    Add _muluhisi3, _mulshisi3, _usmulhisi3.
    * config/avr/libgcc.S (__mulsi3): Rewrite.
    (__mulhisi3): Rewrite.
    (__umulhisi3): Rewrite.
    (__usmulhisi3): New.
    (__muluhisi3): New.
    (__mulshisi3): New.
    (__mulohisi3): New.
    (__mulqi3, __mulqihi3, __umulqihi3, __mulhi3): Use DEFUN/ENDF to
    declare.
    * config/avr/predicates.md (pseudo_register_operand): Rewrite.
    (pseudo_register_or_const_int_operand): New.
    (combine_pseudo_register_operand): New.
    (u16_operand): New.
    (s16_operand): New.
    (o16_operand): New.
    * config/avr/avr.c (avr_rtx_costs): Handle costs for mult:SI.
    * config/avr/avr.md (QIHI, QIHI2): New mode iterators.
    (any_extend, any_extend2): New code iterators.
    (extend_prefix): New code attribute.
    (mulsi3): Rewrite. Turn insn to expander.
    (mulhisi3): Ditto.
    (umulhisi3): Ditto.
    (usmulhisi3): New expander.
    (*mulsi3): New insn-and-split.
    (mulu<mode>si3): New insn-and-split.
    (muls<mode>si3): New insn-and-split.
    (mulohisi3): New insn-and-split.
    (*uumulqihisi3, *uumulhiqisi3, *uumulhihisi3, *uumulqiqisi3,
    *usmulqihisi3, *usmulhiqisi3, *usmulhihisi3, *usmulqiqisi3,
    *sumulqihisi3, *sumulhiqisi3, *sumulhihisi3, *sumulqiqisi3,
    *ssmulqihisi3, *ssmulhiqisi3, *ssmulhihisi3, *ssmulqiqisi3): New
    insn-and-split.
    (*mulsi3_call): Rewrite.
    (*mulhisi3_call): Rewrite.
    (*umulhisi3_call): Rewrite.
    (*usmulhisi3_call): New insn.
    (*muluhisi3_call): New insn.
    (*mulshisi3_call): New insn.
    (*mulohisi3_call): New insn.
    (extendqihi2): Use combine_pseudo_register_operand as predicate
    for operand 1.
    (extendqisi2): Ditto.
    (zero_extendqihi2): Ditto.
    (zero_extendqisi2): Ditto.
    (zero_extendhisi2): Ditto.
    (extendhisi2): Ditto. Don't early-clobber operand 0.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/avr/avr.c
    trunk/gcc/config/avr/avr.md
    trunk/gcc/config/avr/libgcc.S
    trunk/gcc/config/avr/predicates.md
    trunk/gcc/config/avr/t-avr