public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/38271] [4.4 Regression] Spurious / missing "... used uninitialized in this function" warning
Date: Wed, 26 Nov 2008 10:02:00 -0000	[thread overview]
Message-ID: <20081126100052.29248.qmail@sourceware.org> (raw)
In-Reply-To: <bug-38271-16926@http.gcc.gnu.org/bugzilla/>



------- Comment #3 from rguenth at gcc dot gnu dot org  2008-11-26 10:00 -------
Doesn't happen on 64bit x86_64.  Testcase which doesn't warn with 4.3:

struct xxx {
    short a;
    short b;
    void *c;
};

void bar(struct xxx);

void foo(struct xxx *p, int i)
{
  struct xxx s = *p;
  if (s.a) i++;
  bar(s);
}

but indeed, SRA does bullshit here, cost-wise and correctness-wise.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 GCC target triplet|                            |i686-*-*
      Known to work|                            |4.3.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38271


  parent reply	other threads:[~2008-11-26 10:02 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-11-26  2:48 [Bug middle-end/38271] New: " d dot g dot gorbachev at gmail dot com
2008-11-26  2:50 ` [Bug middle-end/38271] " d dot g dot gorbachev at gmail dot com
2008-11-26  2:55 ` [Bug middle-end/38271] [4.4 Regression] " pinskia at gcc dot gnu dot org
2008-11-26 10:02 ` rguenth at gcc dot gnu dot org [this message]
2008-12-03 16:29 ` jakub at gcc dot gnu dot org
2008-12-03 16:40 ` rguenth at gcc dot gnu dot org
2008-12-05 12:58 ` rguenth at gcc dot gnu dot org
2008-12-05 13:06 ` rguenth at gcc dot gnu dot org
2008-12-08 20:35 ` d dot g dot gorbachev at gmail dot com
2008-12-09 19:36 ` mmitchel at gcc dot gnu dot org
2008-12-10 17:23 ` aoliva at gcc dot gnu dot org
2008-12-10 17:37 ` aoliva 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=20081126100052.29248.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).