From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail2-relais-roc.national.inria.fr (mail2-relais-roc.national.inria.fr [192.134.164.83]) by sourceware.org (Postfix) with ESMTPS id 635613846033 for ; Tue, 15 Dec 2020 13:35:54 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 635613846033 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=inria.fr Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=Paul.Zimmermann@inria.fr X-IronPort-AV: E=Sophos;i="5.78,421,1599516000"; d="scan'208";a="483089692" Received: from tomate.loria.fr (HELO tomate) ([152.81.10.51]) by mail2-relais-roc.national.inria.fr with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 15 Dec 2020 14:35:31 +0100 Date: Tue, 15 Dec 2020 14:35:31 +0100 Message-Id: From: Paul Zimmermann To: newlib@sourceware.org Subject: regression in tgamma? X-Spam-Status: No, score=-4.0 required=5.0 tests=BAYES_00, KAM_DMARC_STATUS, RCVD_IN_MSPIKE_H2, 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: newlib@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Newlib mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Dec 2020 13:35:56 -0000 Hi, while updating my comparison from Newlib 3.3.0 to Newlib 4.0.0, I found a regression in tgamma on x86_64/Linux: $ cat test3.c #include #include #ifdef NEWLIB int errno; int* __errno () { return &errno; } #endif int main() { double x = -0x1.53f198fe3b278p+7, y; y = tgamma (x); printf ("x=%a y=%a\n", x, y); } Newlib 3.3.0: $ gcc -DNEWLIB -no-pie test3.c /localdisk/zimmerma/newlib-3.3.0/libm.a; ./a.out x=-0x1.53f198fe3b278p+7 y=0x1.fd6d312572d9cp-1015 Newlib 4.0.0: $ gcc -DNEWLIB -no-pie test3.c /localdisk/zimmerma/newlib-4.0.0/libm.a; ./a.out x=-0x1.53f198fe3b278p+7 y=0x1p+0 Please can someone confirm? Best regards, Paul