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From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/15596] [3.5 Regression] Missed optimization with bitfields
Date: Fri, 28 May 2004 07:11:00 -0000	[thread overview]
Message-ID: <20040527174852.26453.qmail@sourceware.org> (raw)
In-Reply-To: <20040522223754.15596.pinskia@gcc.gnu.org>


------- Additional Comments From pinskia at gcc dot gnu dot org  2004-05-27 17:48 -------
It is much worse for x86.
(-O3 -fomit-frame-pointer)
After:
fun:
        movl    4(%esp), %eax
        movl    8(%esp), %ecx
        movl    (%eax), %edx
        andl    $1048575, %ecx
        andl    $-1048576, %edx
        orl     %ecx, %edx
        movl    %edx, (%eax)
        movzbl  2(%eax), %edx
        orb     $16, %dl
        andb    $-33, %dl
        movb    %dl, 2(%eax)
        movl    12(%esp), %ecx
        movl    (%eax), %edx
        andl    $1, %ecx
        sall    $22, %ecx
        andl    $-4194305, %edx
        orl     %ecx, %edx
        movl    %edx, (%eax)
        ret     $4
Before:
        pushl   %ebp
        andl    $-1048576, %ecx
        movl    %esp, %ebp
        movl    12(%ebp), %edx
        movl    8(%ebp), %eax
        andl    $1048575, %edx
        orl     %edx, %ecx
        movl    16(%ebp), %edx
        orl     $1048576, %ecx
        andl    $-6291457, %ecx
        andl    $1, %edx
        sall    $22, %edx
        orl     %edx, %ecx
        movl    %ecx, (%eax)
        popl    %ebp
        ret     $4

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
 GCC target triplet|powerpc-apple-darwin        |
   Last reconfirmed|0000-00-00 00:00:00         |2004-05-27 17:48:51
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15596


  parent reply	other threads:[~2004-05-27 17:48 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-05-23 21:09 [Bug tree-optimization/15596] New: " pinskia at gcc dot gnu dot org
2004-05-23 21:48 ` [Bug tree-optimization/15596] " pinskia at gcc dot gnu dot org
2004-05-28  7:11 ` pinskia at gcc dot gnu dot org [this message]
2004-06-29 18:17 ` steven at gcc dot gnu dot org
2004-06-29 18:33 ` pinskia at gcc dot gnu dot org
2005-02-11 13:50 ` [Bug tree-optimization/15596] [4.0 " pinskia at gcc dot gnu dot org
2005-02-11 14:12 ` pinskia at gcc dot gnu dot org
2005-02-13  0:59 ` pinskia at gcc dot gnu dot org
2005-04-21  5:00 ` [Bug tree-optimization/15596] [4.0/4.1 " mmitchel at gcc dot gnu dot org
2005-04-25  1:09 ` pinskia at gcc dot gnu dot org
2005-06-24 20:08 ` pinskia at gcc dot gnu dot org
2005-07-08  1:34 ` mmitchel at gcc dot gnu dot org
2005-09-25 11:37 ` bonzini at gcc dot gnu dot org
2005-09-27 16:16 ` mmitchel at gcc dot gnu dot org

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