From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 21834 invoked by alias); 29 Sep 2011 06:58:58 -0000 Received: (qmail 21822 invoked by uid 22791); 29 Sep 2011 06:58:57 -0000 X-SWARE-Spam-Status: No, hits=-2.8 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00,TW_HF X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Thu, 29 Sep 2011 06:58:43 +0000 From: "zeccav at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug fortran/50514] gfortran should check ISHFT & ISHFTC aruments (r178939) Date: Thu, 29 Sep 2011 07:56:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: fortran X-Bugzilla-Keywords: X-Bugzilla-Severity: minor X-Bugzilla-Who: zeccav at gmail dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2011-09/txt/msg02207.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50514 --- Comment #4 from Vittorio Zecca 2011-09-29 06:58:24 UTC --- About run time checking: I believe the bit size of k is known at compile time, and the overhead to check n against it is negligible as compared to computing ishft itself and maybe n. Of course when I am asking -fcheck I am prepared to slower execution, but it may well pay off, if I find a bug. I believe programmer (debugging) time is now costlier than hardware time.