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* Re: optimization/3224: -fomit-frame-pointer generates wrong code (g77)
@ 2002-04-02 4:47 neil
0 siblings, 0 replies; 4+ messages in thread
From: neil @ 2002-04-02 4:47 UTC (permalink / raw)
To: gcc-bugs, gcc-prs, nobody, rguenth
Synopsis: -fomit-frame-pointer generates wrong code (g77)
State-Changed-From-To: feedback->closed
State-Changed-By: neil
State-Changed-When: Tue Apr 2 04:47:28 2002
State-Changed-Why:
Submitter can no longer reproduce.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=3224
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: optimization/3224: -fomit-frame-pointer generates wrong code (g77)
@ 2002-04-02 3:56 Richard Guenther
0 siblings, 0 replies; 4+ messages in thread
From: Richard Guenther @ 2002-04-02 3:56 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR optimization/3224; it has been noted by GNATS.
From: Richard Guenther <rguenth@tat.physik.uni-tuebingen.de>
To: gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org,
rguenth@tat.physik.uni-tuebingen.de, gcc-bugs@gcc.gnu.org
Cc:
Subject: Re: optimization/3224: -fomit-frame-pointer generates wrong code
(g77)
Date: Tue, 02 Apr 2002 13:52:10 +0200
I can no longer reproduce this bug with gcc-3.0.3, so I assume it is fixed.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=3224
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: optimization/3224: -fomit-frame-pointer generates wrong code (g77)
@ 2002-04-02 1:44 rth
0 siblings, 0 replies; 4+ messages in thread
From: rth @ 2002-04-02 1:44 UTC (permalink / raw)
To: gcc-bugs, gcc-prs, nobody, rguenth
Synopsis: -fomit-frame-pointer generates wrong code (g77)
State-Changed-From-To: open->feedback
State-Changed-By: rth
State-Changed-When: Tue Apr 2 01:44:52 2002
State-Changed-Why:
Use -save-temps to save the preprocessed code. As it is,
you reference missing include files.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=3224
^ permalink raw reply [flat|nested] 4+ messages in thread
* optimization/3224: -fomit-frame-pointer generates wrong code (g77)
@ 2001-06-18 5:56 rguenth
0 siblings, 0 replies; 4+ messages in thread
From: rguenth @ 2001-06-18 5:56 UTC (permalink / raw)
To: gcc-gnats
>Number: 3224
>Category: optimization
>Synopsis: -fomit-frame-pointer generates wrong code (g77)
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Mon Jun 18 05:56:02 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: Richard Guenther
>Release: gcc version 3.0
>Organization:
>Environment:
Linux 2.4.3, Athlon
>Description:
The varlimit procedure (in the attached file) called with a field (0:NX2,0:NY2) inside a
common will barf compiled with -fomit-frame-pointer (checked with
-O2 and -O3). SIGSEGV at the second field access, the field
pointer is being destroyed (as viewing from gdb):
Program received signal SIGSEGV, Segmentation fault.
varlimit_ (ilimit=0x87aa9a58, feld=0x3fefffff, varmin=0xbfc5d091,
varmax=0x3fefffff, string=0xde425442, string2=0x3fefffff,
__g77_length_string=-292579374, __g77_length_string2=1072693247)
at hhsub.F:188
188 feld(I,J)=max(feld(i,j),varmin)
Current language: auto; currently fortran
(gdb) bt
#0 varlimit_ (ilimit=0x87aa9a58, feld=0x3fefffff, varmin=0xbfc5d091,
varmax=0x3fefffff, string=0xde425442, string2=0x3fefffff,
__g77_length_string=-292579374, __g77_length_string2=1072693247)
at hhsub.F:188
#1 0x3fefffff in ?? ()
(gdb) print feld
$1 = (PTR TO -> ( real*8 (0:133,0:133))) 0x3fefffff
(which is the same result as after single-stepping through the first iteration)
Generated code is:
(gdb) disassemble
Dump of assembler code for function varlimit_:
0x8089c60 <varlimit_>: push %ebp
0x8089c61 <varlimit_+1>: mov %esp,%ebp
0x8089c63 <varlimit_+3>: push %edi
0x8089c64 <varlimit_+4>: mov 0x8(%ebp),%eax
0x8089c67 <varlimit_+7>: push %esi
0x8089c68 <varlimit_+8>: push %ebx
0x8089c69 <varlimit_+9>: sub $0x1c,%esp
0x8089c6c <varlimit_+12>: mov (%eax),%eax
0x8089c6e <varlimit_+14>: test %eax,%eax
0x8089c70 <varlimit_+16>: jle 0x8089d06 <varlimit_+166>
0x8089c76 <varlimit_+22>: mov 0x91d8024,%esi0x8089c7c <varlimit_+28>: movl $0x1,0xffffffec(%ebp)
0x8089c83 <varlimit_+35>: dec %esi
0x8089c84 <varlimit_+36>: js 0x8089cf9 <varlimit_+153>
0x8089c86 <varlimit_+38>: mov 0x91d8020,%eax
0x8089c8b <varlimit_+43>: movl $0x1,0xffffffe4(%ebp)
0x8089c92 <varlimit_+50>: mov %eax,0xffffffe8(%ebp)
0x8089c95 <varlimit_+53>: lea 0x0(%esi,1),%esi
0x8089c99 <varlimit_+57>: lea 0x0(%edi,1),%edi
0x8089ca0 <varlimit_+64>: mov 0xffffffe8(%ebp),%edx
0x8089ca3 <varlimit_+67>: mov $0x1,%eax
0x8089ca8 <varlimit_+72>: dec %edx0x8089ca9 <varlimit_+73>: js 0x8089cea <varlimit_+138>
0x8089cab <varlimit_+75>: mov 0xffffffe4(%ebp),%ecx
0x8089cae <varlimit_+78>: mov $0x1,%ebx
0x8089cb3 <varlimit_+83>: mov 0x14(%ebp),%eax
0x8089cb6 <varlimit_+86>: imul $0x86,%ecx,%ecx
0x8089cbc <varlimit_+92>: fldl (%eax)
0x8089cbe <varlimit_+94>: mov %esi,%esi
0x8089cc0 <varlimit_+96>: mov 0xc(%ebp),%ebp
0x8089cc3 <varlimit_+99>: lea (%ebx,%ecx,1),%eax
0x8089cc6 <varlimit_+102>: shl $0x3,%eax
0x8089cc9 <varlimit_+105>: fldl (%eax,%ebp,1)
0x8089ccc <varlimit_+108>: mov 0x10(%ebp),%edi
0x8089ccf <varlimit_+111>: fcomi %st(1),%st
0x8089cd1 <varlimit_+113>: fldl (%edi)
0x8089cd3 <varlimit_+115>: fxch %st(1)
0x8089cd5 <varlimit_+117>: fcmovnbe %st(2),%st
0x8089cd7 <varlimit_+119>: fcomi %st(1),%st
0x8089cd9 <varlimit_+121>: fxch %st(1)
0x8089cdb <varlimit_+123>: fcmovnb %st(1),%st
0x8089cdd <varlimit_+125>: fstp %st(1)
0x8089cdf <varlimit_+127>: inc %ebx
0x8089ce0 <varlimit_+128>: dec %edx
0x8089ce1 <varlimit_+129>: fstpl (%eax,%ebp,1)0x8089ce4 <varlimit_+132>: jns 0x8089cc0 <varlimit_+96>
0x8089ce6 <varlimit_+134>: fstp %st(0)
0x8089ce8 <varlimit_+136>: mov %ebx,%eax
0x8089cea <varlimit_+138>: incl 0xffffffe4(%ebp)
0x8089ced <varlimit_+141>: dec %esi
0x8089cee <varlimit_+142>: jns 0x8089ca0 <varlimit_+64>
0x8089cf0 <varlimit_+144>: mov 0xffffffe4(%ebp),%ebp
0x8089cf3 <varlimit_+147>: mov %ebp,0xffffffec(%ebp)
0x8089cf6 <varlimit_+150>: mov %eax,0xfffffff0(%ebp)
0x8089cf9 <varlimit_+153>: call 0x8057080 <bounds_>
0x8089cfe <varlimit_+158>: lea 0xfffffff4(%ebp),%esp
0x8089d01 <varlimit_+161>: pop %ebx
0x8089d02 <varlimit_+162>: pop %esi
0x8089d03 <varlimit_+163>: pop %edi
0x8089d04 <varlimit_+164>: pop %ebp
0x8089d05 <varlimit_+165>: ret
>How-To-Repeat:
If the above code snippet is not enough to find the problem, I can send you the whole package.
>Fix:
As a workaround dont use -fomit-frame-pointer.
>Release-Note:
>Audit-Trail:
>Unformatted:
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^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2002-04-02 12:47 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2002-04-02 4:47 optimization/3224: -fomit-frame-pointer generates wrong code (g77) neil
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2002-04-02 3:56 Richard Guenther
2002-04-02 1:44 rth
2001-06-18 5:56 rguenth
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