X-Recipient: archive-cygwin AT delorie DOT com DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org AA4433951832 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com; s=default; t=1603799083; bh=uUmXowEz7OwfQ4HlDZgm531jrmzQLzMcnRistShgd2g=; h=To:Subject:Date:References:List-Id:List-Unsubscribe:List-Archive: List-Post:List-Help:List-Subscribe:From:Reply-To:From; b=rp7ELZc4Xp2pP3bXWpq8U1Fn12u/vI8NlL7kgiJZQCRwg0V64AJpr/q3cQtNC7f23 eFO7TAhMd55VhNaDeDTBQzT6zzM2PTj82PCeOzuC53IWJBiCWYoCS6jEAxjegQ30ot FlSYRgttUwQ+t2fCR0OiBP14wW7+PlM1Twp82GVM= X-Original-To: cygwin AT cygwin DOT com Delivered-To: cygwin AT cygwin DOT com DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 6D9163951840 X-Injected-Via-Gmane: http://gmane.org/ To: cygwin AT cygwin DOT com Subject: Re: sqrtl behavior inconsistent with sqrt and sqrtf Date: Tue, 27 Oct 2020 07:44:32 -0400 Message-ID: References: Mime-Version: 1.0 User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (cygwin) Cancel-Lock: sha1:6De5zZEQer7fcV1F/onMPDfsOO4= X-Spam-Status: No, score=-2.7 required=5.0 tests=BAYES_00, FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS, KAM_DMARC_STATUS, KAM_GOODAOL, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: cygwin AT cygwin DOT com X-Mailman-Version: 2.1.29 List-Id: General Cygwin discussions and problem reports List-Archive: List-Post: List-Help: List-Subscribe: , From: airplanemath via Cygwin Reply-To: airplanemath Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Cygwin" airplanemath via Cygwin writes: > Compiling and running the attached program with the command line below > produces the output below: > > $ gcc -O0 -Og test_sqrt.c -o test_sqrt && ./test_sqrt > Long double: -inf -inf > Double: -inf -nan > Float: -inf -nan > > I suspect the behavior for long double should be the same as for double > and float (sqrt(-inf) = nan), but I'm not sure where to change that. > I'm running a snapshot of Cygwin 3.2.0, if that's important. The mail archive says I'm bad at attaching things. Program source included below: #include #include int main() { long double a, b; double c, d; float f, g; a = (long double) -INFINITY; c = (double) -INFINITY; f = (float) -INFINITY; b = sqrtl(a); d = sqrt(c); g = sqrtf(f); printf("Long double: %4Lf %4Lf\n", a, b); printf("Double: %4lf %4lf\n", c, d); printf("Float: %4f %4f\n", f, g); return 0; } -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple