[Bug target/19201] [m68k] Inefficient code for array accesses (from old PROBLEMS)

[mikpe at it dot uu.se]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19201

Mikael Pettersson <mikpe at it dot uu.se> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mikpe at it dot uu.se

--- Comment #14 from Mikael Pettersson <mikpe at it dot uu.se> 2011-02-26 11:35:50 UTC ---
(In reply to comment #13)
> Also fine, not closed. Great to see that you pay enough attention to stop the
> reporter from closing his own PRs. I wish you would be just as fast with
> actually doing something about them. It is not even clear whether these
> problems still exist!

The missed optimization still occurs with gcc-4.6, which generates:

f:
        move.l 4(%sp),%a0
        move.l (%a0),%a1
        move.l 4(%a0),%d0
        clr.b (%a1,%d0.l)
        rts
        .size   f, .-f
        .ident  "GCC: (GNU) 4.6.0 20110219 (experimental)"

I'll try Kazu's patch in my next 4.4 bootstrap/regtest.