From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-426828-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 26094 invoked by alias); 27 Jul 2013 19:44:33 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Received: (qmail 26053 invoked by uid 48); 27 Jul 2013 19:44:31 -0000
From: "dushistov at mail dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/58005] New: missed optimization printf constant string
Date: Sat, 27 Jul 2013 19:44:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 4.8.1
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: dushistov at mail dot ru
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter
Message-ID: <bug-58005-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2013-07/txt/msg01335.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58005

            Bug ID: 58005
           Summary: missed optimization printf constant string
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dushistov at mail dot ru

Simple code:

#include <cstdio>

int main()
{
    printf("%s: test1\n", __PRETTY_FUNCTION__);//1
    printf("test2\n");//2
    return 0;
}

compiled to:

callq  4005a0 <__printf_chk@plt> (1)
and to
callq  400590 <puts@plt> for (2)

I think that, because of __PRETTY_FUNCTION__ is known during compile time, it
is also possible converting (1) to "puts" call.

This optimization can help speedup loging functionality.