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From: "gcc-bugzilla at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/26144] New: with -O3 and pointer casts, gcc skips if
Date: Tue, 07 Feb 2006 00:42:00 -0000 [thread overview]
Message-ID: <bug-26144-12145@http.gcc.gnu.org/bugzilla/> (raw)
When casting a pointer and checking for == NULL, the check is skipped
when -O3 is enabled. I found this problem while compiling bind with
uClibc,
but could reproduce the problem with the debian version of gcc and this
simple
test file.
Environment:
System: Linux dungeon2 2.6.11-1-k7-smp #1 SMP Mon Jun 20 22:34:51 MDT 2005 i686
GNU/Linux
Architecture: i686
host: i486-pc-linux-gnu
build: i486-pc-linux-gnu
target: i486-pc-linux-gnu
configured with: ../src/configure -v
--enable-languages=c,c++,java,f95,objc,ada,treelang --prefix=/usr
--enable-shared --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix --enable-nls
--program-suffix=-4.0 --enable-__cxa_atexit --enable-clocale=gnu
--enable-libstdcxx-debug --enable-java-awt=gtk-default --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.4.2-gcj-4.0-1.4.2.0/jre --enable-mpfr
--disable-werror --with-tune=i686 --enable-checking=release i486-linux-gnu
How-To-Repeat:
Compile this file:
#include <stdio.h>
void foo(char **dee) { *dee = ""; }
int main(int argc, char *argv[])
{
struct blah *ptr = argv[1];
if(ptr == NULL)
foo(&ptr);
printf("%p", ptr); // output: (nil) expected: 0xADDRESS
return 0;
}
--
Summary: with -O3 and pointer casts, gcc skips if
Product: gcc
Version: 4.0.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: devin at dungeon2 dot cainetworks dot com
GCC build triplet: i486-pc-linux-gnu
GCC host triplet: i486-pc-linux-gnu
GCC target triplet: i486-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26144
next reply other threads:[~2006-02-07 0:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-07 0:42 gcc-bugzilla at gcc dot gnu dot org [this message]
2006-02-07 0:53 ` [Bug tree-optimization/26144] " pinskia at gcc dot gnu dot org
2006-02-07 17:07 ` devin at freeshell dot org
2006-02-09 1:02 ` pinskia at gcc dot gnu dot org
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