public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug c++/21972] New: Bad code generated
@ 2005-06-09  0:20 jordi dot prats at gmail dot com
  2005-06-09  0:25 ` [Bug c++/21972] " pinskia at gcc dot gnu dot org
  0 siblings, 1 reply; 2+ messages in thread
From: jordi dot prats at gmail dot com @ 2005-06-09  0:20 UTC (permalink / raw)
  To: gcc-bugs

g++ compile fine (without any warning) this example program:

/*CODE*/

#include <iostream>

typedef struct sA
{
  int bb;
}AA;

int main()
{
  AA *p;
  
  p=NULL;

  for(int i=(p==NULL)?0:p->bb;i<(p==NULL)?30:(p->bb+4);i++)
    {
      std::cout << i;
    }

  return 1;
}

/*CODE*/

compile: g++ -g main.cxx -o main

If you try to execute it you'll get a segmentation fault. It should produce the
same output than with this for:

for(int i=0;i<30);i++)

-- 
           Summary: Bad code generated
           Product: gcc
           Version: 3.4.3
            Status: UNCONFIRMED
          Severity: critical
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jordi dot prats at gmail dot com
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: GNU/Linux 2.6.11 AMD64
GCC target triplet: GNU/Linux 2.6.11 AMD64


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21972


^ permalink raw reply	[flat|nested] 2+ messages in thread
* [Bug c++/21972] Bad code generated
  2005-06-09  0:20 [Bug c++/21972] New: Bad code generated jordi dot prats at gmail dot com
@ 2005-06-09  0:25 ` pinskia at gcc dot gnu dot org
  0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-06-09  0:25 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From pinskia at gcc dot gnu dot org  2005-06-09 00:24 -------
Nope this is not generating bad code.
i<(p==NULL)?30:(p->bb+4)

is equivalent to
(i<(p==NULL))?30:(p->bb+4)

You want "i<((p==NULL)?30:(p->bb+4))".

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21972


^ permalink raw reply	[flat|nested] 2+ messages in thread
end of thread, other threads:[~2005-06-09  0:25 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2005-06-09  0:20 [Bug c++/21972] New: Bad code generated jordi dot prats at gmail dot com
2005-06-09  0:25 ` [Bug c++/21972] " pinskia at gcc dot gnu dot org

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).