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From: "bangerth at dealii dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/13005] Pointer wrongly adjusted for derived class containing virtual function
Date: Tue, 11 Nov 2003 17:57:00 -0000 [thread overview]
Message-ID: <20031111175752.6711.qmail@sources.redhat.com> (raw)
In-Reply-To: <20031111075141.13005.stephenma@telus.net>
------- Additional Comments From bangerth at dealii dot org 2003-11-11 17:57 -------
Oh, yes, and one more datapoint: without optimization, I get this assembler code:
pushl %ebp
movl %esp, %ebp
movl 8(%ebp), %eax
movl (%eax), %edx
addl $4, %edx
movl 12(%ebp), %eax
movl %eax, 4(%edx)
popl %ebp
ret
That is, the addl is there. On the other hand, _with_ optimization, we get
pushl %ebp
movl %esp, %ebp
movl 8(%ebp), %eax
movl (%eax), %edx
movl 12(%ebp), %eax
movl %eax, 8(%edx)
popl %ebp
ret
The addl is gone, but note that in the first case the result is written
into 4(%edx), while in the second into 8(%edx). My assembler times have
long gone for good, but to me this seems functionally equivalent.
W.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13005
next prev parent reply other threads:[~2003-11-11 17:57 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-11 7:51 [Bug c++/13005] New: " stephenma at telus dot net
2003-11-11 16:01 ` [Bug c++/13005] " bangerth at dealii dot org
2003-11-11 17:54 ` bangerth at dealii dot org
2003-11-11 17:57 ` bangerth at dealii dot org [this message]
2003-11-15 9:10 ` [Bug c++/13005] [aliasing] " pinskia at gcc dot gnu dot org
2003-11-15 9:10 ` pinskia at gcc dot gnu dot org
2003-11-16 12:04 ` geoffk at gcc dot gnu dot org
2003-12-04 18:38 ` [Bug c++/13005] [3.3/3.4 Regresssion] " pinskia at gcc dot gnu dot org
2003-12-24 15:14 ` jazzdaq at yahoo dot com
2003-12-24 21:55 ` gdr at gcc dot gnu dot org
2003-12-29 20:50 ` nathan at gcc dot gnu dot org
2003-12-31 9:48 ` stephenma at telus dot net
2003-12-31 12:15 ` nathan at gcc dot gnu dot org
2003-12-31 17:57 ` pinskia at gcc dot gnu dot org
2004-01-01 1:02 ` stephenma at telus dot net
2004-01-01 1:09 ` pinskia at gcc dot gnu dot org
2004-01-08 2:02 ` stephenma at telus dot net
2004-01-08 2:24 ` [Bug c++/13005] " pinskia at gcc dot gnu dot org
2004-01-08 8:10 ` falk dot hueffner at student dot uni-tuebingen dot de
2004-01-08 18:13 ` gdr at integrable-solutions dot net
2004-01-09 1:33 ` stephenma at telus dot net
2004-01-09 1:46 ` stephenma at telus dot net
2004-01-09 4:17 ` gdr at integrable-solutions dot net
2004-01-09 4:24 ` gdr at integrable-solutions dot net
2004-01-09 8:40 ` stephenma at telus dot net
2004-01-09 8:46 ` stephenma at telus dot net
2004-01-09 15:16 ` bangerth at dealii dot org
2004-01-10 2:13 ` gdr at integrable-solutions dot net
2004-01-10 2:16 ` gdr at integrable-solutions dot net
2004-01-10 5:45 ` stephenma at telus dot net
2004-01-10 5:48 ` stephenma at telus dot net
2004-01-10 5:53 ` stephenma at telus dot net
2004-01-10 16:02 ` gdr at integrable-solutions dot net
2004-07-27 3:13 ` [Bug c++/13005] Pointer " pinskia at gcc dot gnu dot org
2005-09-23 22:35 ` pinskia at gcc dot gnu dot org
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