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From: "mikpe at it dot uu.se" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/45813] alias analysis problem ?
Date: Thu, 30 Sep 2010 04:50:00 -0000	[thread overview]
Message-ID: <20100930045000.rinU77i5qG8lP3aG3OviIVISIi077KjXnYkUKh81pdo@z> (raw)
In-Reply-To: <bug-45813-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45813

--- Comment #10 from Mikael Pettersson <mikpe at it dot uu.se> 2010-09-29 20:59:17 UTC ---
This was fixed for 4.6 by r160260:
http://gcc.gnu.org/viewcvs?view=revision&revision=160260

Applying that to 4.5 changes 4.5's output to:

ReadLE16U:
        push    {r7, lr}
        ldrb    r3, [r0]
        sub     sp, sp, #8
        add     r7, sp, #0
        strb    r3, [r7, #6]
        ldrb    r3, [r0, #1]
        mov     sp, r7
        add     sp, sp, #8
        strb    r3, [r7, #7]
        ldrh    r0, [r7, #6]
        @ sp needed for prologue
        pop     {r7, pc}

which is much better.  (It still runs into PR38644, but that can be avoided by
-fno-schedule-insns2 or by applying my proposed patch for PR38644.)


  parent reply	other threads:[~2010-09-29 20:59 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-09-28 12:34 [Bug rtl-optimization/45813] New: " darrenrjenkins at gmail dot com
2010-09-28 14:06 ` [Bug rtl-optimization/45813] " rguenth at gcc dot gnu.org
2010-09-28 15:09 ` mikpe at it dot uu.se
2010-09-29 11:04 ` darrenrjenkins at gmail dot com
2010-09-29 11:04 ` mikpe at it dot uu.se
2010-09-29 11:20 ` darrenrjenkins at gmail dot com
2010-09-29 11:21 ` darrenrjenkins at gmail dot com
2010-09-29 12:01 ` darrenrjenkins at gmail dot com
2010-09-29 12:48 ` rguenth at gcc dot gnu.org
2010-09-30  1:18 ` mikpe at it dot uu.se
2010-09-30  4:50 ` mikpe at it dot uu.se [this message]
2010-09-30 10:58 ` [Bug rtl-optimization/45813] [4.4/4.5 Regression] alias analysis problem with -mthumb rguenth at gcc dot gnu.org
2010-10-01 11:53 ` jakub at gcc dot gnu.org
2010-11-12 14:04 ` rguenth at gcc dot gnu.org
2011-04-16 10:15 ` jakub at gcc dot gnu.org
2011-04-19  9:06 ` rguenth at gcc dot gnu.org
2012-03-13 14:40 ` [Bug rtl-optimization/45813] [4.5 " jakub at gcc dot gnu.org
2012-03-13 17:06 ` bernds at gcc dot gnu.org
2012-03-15  8:45 ` mikpe at it dot uu.se
2012-07-02 10:46 ` rguenth at gcc dot gnu.org

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