public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "bonzini at gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/39867] [4.4/4.5 Regression] Wrong result of conditional operator exp < 2 ? 2U : (unsigned int) exp
Date: Thu, 23 Apr 2009 15:23:00 -0000	[thread overview]
Message-ID: <20090423152255.9107.qmail@sourceware.org> (raw)
In-Reply-To: <bug-39867-6373@http.gcc.gnu.org/bugzilla/>



------- Comment #3 from bonzini at gnu dot org  2009-04-23 15:22 -------
Created an attachment (id=17684)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=17684&action=view)
patch

Bootstrapped but not yet regtested.  Testcase:

/* { dg-do link } */
/* { dg-options "-O2" } */

int main (void)
{
  int exp = -1;
  /* Wrong folding of the LHS to an unsigned MAX leads to 4294967295 > 2.  */
  if (("%u\n", exp < 2 ? 2U : (unsigned int) exp) > 2)
    link_error ();
  return 0;
}


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39867


  parent reply	other threads:[~2009-04-23 15:23 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-04-23 13:34 [Bug c/39867] New: [4.4 " vincent at vinc17 dot org
2009-04-23 13:45 ` [Bug c/39867] " vincent at vinc17 dot org
2009-04-23 13:46 ` [Bug middle-end/39867] " rguenth at gcc dot gnu dot org
2009-04-23 15:16 ` [Bug middle-end/39867] [4.4/4.5 " bonzini at gnu dot org
2009-04-23 15:23 ` bonzini at gnu dot org [this message]
2009-04-23 15:52 ` bonzini at gnu dot org
2009-04-24 10:29 ` bonzini at gcc dot gnu dot org
2009-04-24 11:35 ` bonzini at gnu dot org
2009-04-24 11:35 ` bonzini at gcc dot gnu dot org
2009-06-23  9:44 ` rguenth at gcc dot gnu dot org

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20090423152255.9107.qmail@sourceware.org \
    --to=gcc-bugzilla@gcc.gnu.org \
    --cc=gcc-bugs@gcc.gnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
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).