[Bug web/55237] Linkify r123456 in comments to point to SVN

["LpSolit at netscape dot net" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55237

--- Comment #11 from Frédéric Buclin <LpSolit at netscape dot net> ---
What's the max value of a register name? r31?
>From gcc-bugs-return-422314-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 15 10:42:49 2013
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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/57281] [4.9 Regression] x86_64-linux loop fails to terminate at -O3 -m32
Date: Wed, 15 May 2013 10:42:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idW281

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ebotcazou at gcc dot gnu.org

--- Comment #5 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> postreload leaves a REG_DEAD note on the
>
> (insn 19 78 21 4 (parallel [
>             (set (mem:DI (reg/f:SI 3 bx [orig:68 D.1736 ] [68]) [4 *_18+0 S8
> A64])
>                 (sign_extend:DI (reg:SI 0 ax [orig:75 b ] [75])))
>             (clobber (reg:CC 17 flags))
>             (clobber (reg:SI 1 dx [80]))
>         ]) t.c:9 137 {extendsidi2_1}
>      (expr_list:REG_UNUSED (reg:SI 1 dx [80])
>         (expr_list:REG_DEAD (reg:SI 0 ax [orig:75 b ] [75])
>             (nil))))
>
> which is bogus.

Leaving REG_DEAD/REG_UNUSED notes at the end of a pass is OK, it's up to the
next pass using them to make sure they are valid by invoking DF.