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* Re: optimization/7002: gcc -fPIC incorrect optimization on i586
@ 2002-10-05 12:06 Sven Verdoolaege
  0 siblings, 0 replies; 4+ messages in thread
From: Sven Verdoolaege @ 2002-10-05 12:06 UTC (permalink / raw)
  To: nobody; +Cc: gcc-prs

The following reply was made to PR optimization/7002; it has been noted by GNATS.

From: Sven Verdoolaege <skimo@kotnet.org>
To: hubicka@gcc.gnu.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
  nobody@gcc.gnu.org, gcc-gnats@gcc.gnu.org
Cc:  
Subject: Re: optimization/7002: gcc -fPIC incorrect optimization on i586
Date: Sat, 5 Oct 2002 21:01:33 +0200

 On Thu, Oct 03, 2002 at 05:29:47PM -0000, hubicka@gcc.gnu.org wrote:
 > Synopsis: gcc -fPIC incorrect optimization on i586
 > 
 > State-Changed-From-To: open->feedback
 > State-Changed-By: hubicka
 > State-Changed-When: Thu Oct  3 10:29:46 2002
 > State-Changed-Why:
 >     The code produced by 3.2 branch looks entirely different now and testcase is dificult to analyze.  Is it still broken?
 > 
 
 It's difficult to say.  The particular snippet of code shown
 in the bug report seems to get compiled correctly,
 but something in the same file still gets compiled incorrectly
 with both -fPIC and -O2 and not with just -fPIC.
 I'll submit a new bug report when I figure out where the
 problem moved.
 
 skimo


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: optimization/7002: gcc -fPIC incorrect optimization on i586
@ 2002-10-10 11:28 hubicka
  0 siblings, 0 replies; 4+ messages in thread
From: hubicka @ 2002-10-10 11:28 UTC (permalink / raw)
  To: gcc-bugs, gcc-prs, nobody, skimo

Synopsis: gcc -fPIC incorrect optimization on i586

State-Changed-From-To: feedback->closed
State-Changed-By: hubicka
State-Changed-When: Thu Oct 10 11:28:27 2002
State-Changed-Why:
    OK, so I am closing the bugreport.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7002


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: optimization/7002: gcc -fPIC incorrect optimization on i586
@ 2002-10-03 10:29 hubicka
  0 siblings, 0 replies; 4+ messages in thread
From: hubicka @ 2002-10-03 10:29 UTC (permalink / raw)
  To: gcc-bugs, gcc-prs, nobody, skimo

Synopsis: gcc -fPIC incorrect optimization on i586

State-Changed-From-To: open->feedback
State-Changed-By: hubicka
State-Changed-When: Thu Oct  3 10:29:46 2002
State-Changed-Why:
    The code produced by 3.2 branch looks entirely different now and testcase is dificult to analyze.  Is it still broken?

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7002


^ permalink raw reply	[flat|nested] 4+ messages in thread

* optimization/7002: gcc -fPIC incorrect optimization on i586
@ 2002-06-12  4:46 skimo
  0 siblings, 0 replies; 4+ messages in thread
From: skimo @ 2002-06-12  4:46 UTC (permalink / raw)
  To: gcc-gnats


>Number:         7002
>Category:       optimization
>Synopsis:       gcc -fPIC incorrect optimization on i586
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Wed Jun 12 04:46:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Sven Verdoolaege <skimo@kotnet.org>
>Release:        3.1
>Organization:
>Environment:
System: Linux pool 2.4.12 #31 Sat Oct 13 23:07:11 CEST 2001 i586 unknown
Architecture: i586

        <machine, os, target, libraries (multiple lines)>
host: i586-pc-linux-gnu
build: i586-pc-linux-gnu
target: i586-pc-linux-gnu
configured with: ../../src/gcc/configure --enable-shared --prefix=/usr : (reconf
igured) ../../src/gcc/configure --enable-shared --prefix=/usr
GNU C Library stable release version 2.2.4, by Roland McGrath et al.
GNU ld version 2.12.90.0.9 20020526
>Description:
The following piece of code (in a certain context) is compiled incorrectly
with -O2 -fPIC.  It compiles correctly without either of the two.

  vert = Matrix_Alloc(temp->NbRows-1, temp->NbColumns);
  for (i = 1; i < temp->NbRows; i++)
    for (j = 0; j < temp->NbColumns ; j++)
      ((vert->p[i-1][j]) = (temp->p[0][j])-(temp->p[i][j]));

(line 2257 of Lattice.i)

objdump:
      value_substract(vert->p[i-1][j],temp->p[0][j],temp->p[i][j]);
 3e5:   8b 75 e4                mov    0xffffffe4(%ebp),%esi
 3e8:   8b bd 58 ff ff ff       mov    0xffffff58(%ebp),%edi
%edi contains temp->p[i]  
%ecx contains temp->p[0]
 3ee:   8b 04 f1                mov    (%ecx,%esi,8),%eax
 3f1:   8b 54 f1 04             mov    0x4(%ecx,%esi,8),%edx
 3f5:   2b 04 f7                sub    (%edi,%esi,8),%eax
 3f8:   1b 54 f7 04             sbb    0x4(%edi,%esi,8),%edx
subtraction is correctly performed,
 3fc:   89 04 f7                mov    %eax,(%edi,%esi,8)
but result is written back into temp->p[i][j] instead
of into vert->p[i-1][j]  
 3ff:   8b 85 50 ff ff ff       mov    0xffffff50(%ebp),%eax
 405:   89 54 f7 04             mov    %edx,0x4(%edi,%esi,8) 
 409:   46                      inc    %esi
 40a:   89 75 e4                mov    %esi,0xffffffe4(%ebp)
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2002-10-10 18:28 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2002-10-05 12:06 optimization/7002: gcc -fPIC incorrect optimization on i586 Sven Verdoolaege
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2002-10-10 11:28 hubicka
2002-10-03 10:29 hubicka
2002-06-12  4:46 skimo

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