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* Re: optimization/6631: Miscompiled structure access
@ 2002-10-08 11:46 Janis Johnson
0 siblings, 0 replies; 4+ messages in thread
From: Janis Johnson @ 2002-10-08 11:46 UTC (permalink / raw)
To: jakub; +Cc: gcc-prs
The following reply was made to PR optimization/6631; it has been noted by GNATS.
From: Janis Johnson <janis187@us.ibm.com>
To: gcc-gnats@gcc.gnu.org
Cc:
Subject: Re: optimization/6631: Miscompiled structure access
Date: Tue, 8 Oct 2002 11:39:50 -0700
This is a regression from GCC 3.0 that was exposed by the following cp
patch:
2002-04-30 Mark Mitchell <mark@codesourcery.com>
ABI change, returning simple classes from functions.
* class.c (finish_struct_bits): Only mark TREE_ADDRESSABLE if
TYPE_HAS_TRIVIAL_INIT_REF is false or
TYPE_HAS_NONTRIVIAL_DESTRUCTOR is true.
The test passes with optimization on if it is altered by adding a
destructor or a copy constructor to class QSize, or by removing "const"
from "inline const QSize operator+".
I'm not planning to investigate this further, but hope this additional
information will be useful.
Janis
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: optimization/6631: Miscompiled structure access
@ 2002-10-14 14:20 mmitchel
0 siblings, 0 replies; 4+ messages in thread
From: mmitchel @ 2002-10-14 14:20 UTC (permalink / raw)
To: gcc-bugs, gcc-prs, jakub, schwab
Synopsis: Miscompiled structure access
State-Changed-From-To: open->closed
State-Changed-By: mmitchel
State-Changed-When: Mon Oct 14 14:20:17 2002
State-Changed-Why:
Fixed in GCC 3.2.1.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=6631
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: optimization/6631: Miscompiled structure access
@ 2002-05-13 0:14 jakub
0 siblings, 0 replies; 4+ messages in thread
From: jakub @ 2002-05-13 0:14 UTC (permalink / raw)
To: gcc-bugs, gcc-prs, jakub, nobody, schwab
Synopsis: Miscompiled structure access
Responsible-Changed-From-To: unassigned->jakub
Responsible-Changed-By: jakub
Responsible-Changed-When: Mon May 13 00:14:15 2002
Responsible-Changed-Why:
Mine.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=6631
^ permalink raw reply [flat|nested] 4+ messages in thread
* optimization/6631: Miscompiled structure access
@ 2002-05-10 18:26 Andreas Schwab
0 siblings, 0 replies; 4+ messages in thread
From: Andreas Schwab @ 2002-05-10 18:26 UTC (permalink / raw)
To: gcc-gnats
>Number: 6631
>Category: optimization
>Synopsis: Miscompiled structure access
>Confidential: no
>Severity: critical
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Fri May 10 18:26:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:
>Release: 3.1 20020506 (prerelease)
>Organization:
>Environment:
System: Linux sykes 2.4.18-SMP #1 SMP Sat Apr 13 18:56:25 UTC 2002 ia64 unknown unknown GNU/Linux
Architecture: ia64
host: ia64-suse-linux-gnu
build: ia64-suse-linux-gnu
target: ia64-suse-linux-gnu
configured with: ../configure --enable-threads=posix --prefix=/usr --with-local-prefix=/usr/local --infodir=/usr/share/info --mandir=/usr/share/man --libdir=/usr/lib --enable-languages=c,c++,f77,objc,java,ada --with-gxx-include-dir=/usr/include/g++ --with-slibdir=/lib --with-system-zlib --enable-shared --enable-checking ia64-suse-linux
>Description:
life_analysis misoptimizes out code to initialize the fields of a structure.
>How-To-Repeat:
$ cat qsize.cpp
void abort (void);
struct QSize
{
QSize();
QSize( int w, int h );
int wd, ht;
friend inline const QSize operator+( const QSize &, const QSize & );
};
inline QSize::QSize()
{ wd = ht = -1; }
inline QSize::QSize( int w, int h )
{ wd = w; ht = h; }
inline const QSize operator+( const QSize & s1, const QSize & s2 )
{ return QSize(s1.wd+s2.wd, s1.ht+s2.ht); }
QSize minimumSize()
{
return QSize (100, 200);
}
QSize totalMinimumSize()
{
QSize s = minimumSize();
return s + QSize( 0, 0 );
}
int main()
{
QSize s = totalMinimumSize();
if (s.wd != 100 || s.ht != 200)
abort ();
}
$ gcc -O -v qsize.cpp
Reading specs from /usr/lib/gcc-lib/ia64-suse-linux/3.1/specs
Configured with: ../configure --enable-threads=posix --prefix=/usr --with-local-prefix=/usr/local --infodir=/usr/share/info --mandir=/usr/share/man --libdir=/usr/lib --enable-languages=c,c++,f77,objc,java,ada --with-gxx-include-dir=/usr/include/g++ --with-slibdir=/lib --with-system-zlib --enable-shared --enable-checking ia64-suse-linux
Thread model: posix
gcc version 3.1 20020506 (prerelease)
/usr/lib/gcc-lib/ia64-suse-linux/3.1/cc1plus -v -D__GNUC__=3 -D__GNUC_MINOR__=1 -D__GNUC_PATCHLEVEL__=0 -D__gnu_linux__ -D__linux -D__linux__ -D_LONGLONG -Dlinux -Dunix -D__gnu_linux__ -D__linux -D__linux__ -D_LONGLONG -D__linux__ -D__unix__ -D__linux -D__unix -Asystem=linux -D__OPTIMIZE__ -D__STDC_HOSTED__=1 -D_GNU_SOURCE -Acpu=ia64 -Amachine=ia64 -D__ia64 -D__ia64__ -D_LP64 -D__LP64__ -D__ELF__ -D__LONG_MAX__=9223372036854775807L qsize.cpp -D__GNUG__=3 -D__DEPRECATED -D__EXCEPTIONS -D__GXX_ABI_VERSION=100 -quiet -dumpbase qsize.cpp -O -version -o /tmp/ccd2tZb1.s
GNU CPP version 3.1 20020506 (prerelease) (cpplib) (IA-64) Linux
GNU C++ version 3.1 20020506 (prerelease) (ia64-suse-linux)
compiled by GNU C version 3.1 20020506 (prerelease).
#include "..." search starts here:
#include <...> search starts here:
/usr/include/g++
/usr/include/g++/ia64-suse-linux
/usr/include/g++/backward
/usr/local/include
/usr/lib/gcc-lib/ia64-suse-linux/3.1/include
/usr/ia64-suse-linux/include
/usr/include
End of search list.
/usr/lib/gcc-lib/ia64-suse-linux/3.1/../../../../ia64-suse-linux/bin/as -x -o /tmp/cci5U9Z1.o /tmp/ccd2tZb1.s
/usr/lib/gcc-lib/ia64-suse-linux/3.1/collect2 -dynamic-linker /lib/ld-linux-ia64.so.2 /usr/lib/gcc-lib/ia64-suse-linux/3.1/../../../crt1.o /usr/lib/gcc-lib/ia64-suse-linux/3.1/../../../crti.o /usr/lib/gcc-lib/ia64-suse-linux/3.1/crtbegin.o -L/usr/lib/gcc-lib/ia64-suse-linux/3.1 -L/usr/lib/gcc-lib/ia64-suse-linux/3.1/../../../../ia64-suse-linux/lib -L/usr/lib/gcc-lib/ia64-suse-linux/3.1/../../.. /tmp/cci5U9Z1.o -lgcc -lgcc_eh -lc -lgcc -lgcc_eh /usr/lib/gcc-lib/ia64-suse-linux/3.1/crtend.o /usr/lib/gcc-lib/ia64-suse-linux/3.1/../../../crtn.o
You have new mail in /suse/schwab/Mail/.incoming
$ ./a.out
Aborted
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2002-10-14 21:20 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2002-10-08 11:46 optimization/6631: Miscompiled structure access Janis Johnson
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2002-10-14 14:20 mmitchel
2002-05-13 0:14 jakub
2002-05-10 18:26 Andreas Schwab
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