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From: "gjl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/34792] [avr] c++ worse than c compiler at 8-bit optimisations
Date: Sun, 09 Oct 2011 20:53:00 -0000
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X-Bugzilla-Keywords: missed-optimization
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34792

Georg-Johann Lay <gjl at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|avr-*-*                     |avr
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |gjl at gcc dot gnu.org
         Resolution|                            |FIXED
   Target Milestone|---                         |4.7.0

--- Comment #1 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-10-09 20:52:54 UTC ---
Cosed as fixed in 4.7.0. With -Os -mmcu=avr4 both avr-gcc and avr-g++ compile
to the same, optimal code:

bar2:
    eor r22,r24
    andi r22,lo8(15)
    mov r30,r22
    ldi r31,lo8(0)
    subi r30,lo8(-(data))
    sbci r31,hi8(-(data))
    ld r24,Z
    ret

_Z4bar2hh:
    eor r22,r24
    andi r22,lo8(15)
    mov r30,r22
    ldi r31,lo8(0)
    subi r30,lo8(-(data))
    sbci r31,hi8(-(data))
    ld r24,Z
    ret