From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from donkey.elm.relay.mailchannels.net (donkey.elm.relay.mailchannels.net [23.83.212.49]) by sourceware.org (Postfix) with ESMTPS id DD00F3858C27 for ; Wed, 30 Dec 2020 05:31:39 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org DD00F3858C27 X-Sender-Id: dreamhost|x-authsender|siddhesh@gotplt.org Received: from relay.mailchannels.net (localhost [127.0.0.1]) by relay.mailchannels.net (Postfix) with ESMTP id 4E739101F2B; Wed, 30 Dec 2020 05:31:38 +0000 (UTC) Received: from pdx1-sub0-mail-a94.g.dreamhost.com (100-105-161-17.trex.outbound.svc.cluster.local [100.105.161.17]) (Authenticated sender: dreamhost) by relay.mailchannels.net (Postfix) with ESMTPA id A3DD4101F7E; Wed, 30 Dec 2020 05:31:37 +0000 (UTC) X-Sender-Id: dreamhost|x-authsender|siddhesh@gotplt.org Received: from pdx1-sub0-mail-a94.g.dreamhost.com (pop.dreamhost.com [64.90.62.162]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384) by 0.0.0.0:2500 (trex/5.18.11); Wed, 30 Dec 2020 05:31:38 +0000 X-MC-Relay: Neutral X-MailChannels-SenderId: dreamhost|x-authsender|siddhesh@gotplt.org X-MailChannels-Auth-Id: dreamhost X-Obese-Zesty: 26f704ed23ddb591_1609306297936_310132864 X-MC-Loop-Signature: 1609306297935:986977687 X-MC-Ingress-Time: 1609306297935 Received: from pdx1-sub0-mail-a94.g.dreamhost.com (localhost [127.0.0.1]) by pdx1-sub0-mail-a94.g.dreamhost.com (Postfix) with ESMTP id 63D777F8F4; Tue, 29 Dec 2020 21:31:37 -0800 (PST) Received: from rhbox.intra.reserved-bit.com (unknown [1.186.101.110]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: siddhesh@gotplt.org) by pdx1-sub0-mail-a94.g.dreamhost.com (Postfix) with ESMTPSA id DC91B80026; Tue, 29 Dec 2020 21:31:35 -0800 (PST) X-DH-BACKEND: pdx1-sub0-mail-a94 From: Siddhesh Poyarekar To: libc-alpha@sourceware.org Subject: [COMMITTED] x86 long double: Consider pseudo numbers as signaling Date: Wed, 30 Dec 2020 11:01:26 +0530 Message-Id: <20201230053126.311146-1-siddhesh@sourceware.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <66af299c-54d4-2163-2430-91a258afc892@linaro.org> References: <66af299c-54d4-2163-2430-91a258afc892@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spam-Status: No, score=-9.0 required=5.0 tests=BAYES_00, GIT_PATCH_0, JMQ_SPF_NEUTRAL, KAM_DMARC_NONE, KAM_DMARC_STATUS, KAM_SHORT, RCVD_IN_BARRACUDACENTRAL, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NEUTRAL, 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: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Dec 2020 05:31:41 -0000 > Afaik, there is no need to __attribute__ ((unused)) on arguments for > static inline functions. You're right, this is what I finally committed. Thanks, Siddhesh Add support to treat pseudo-numbers specially and implement x86 version to consider all of them as signaling. Reviewed-by: Adhemerval Zanella --- sysdeps/generic/nan-pseudo-number.h | 31 ++++++++++++++++++++++++ sysdeps/ieee754/ldbl-96/s_issignalingl.c | 11 ++++++--- sysdeps/x86/fpu/nan-pseudo-number.h | 30 +++++++++++++++++++++++ 3 files changed, 69 insertions(+), 3 deletions(-) create mode 100644 sysdeps/generic/nan-pseudo-number.h create mode 100644 sysdeps/x86/fpu/nan-pseudo-number.h diff --git a/sysdeps/generic/nan-pseudo-number.h b/sysdeps/generic/nan-ps= eudo-number.h new file mode 100644 index 0000000000..b39e347402 --- /dev/null +++ b/sysdeps/generic/nan-pseudo-number.h @@ -0,0 +1,31 @@ +/* Pseudo-normal number handling. Generic version. + Copyright (C) 2020 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#ifndef NAN_PSEUDO_NUMBER_H +#define NAN_PSEUDO_NUMBER_H 1 + +/* Set this macro and override the definition of IS_PSEUDO_SIGNALING if = pseudo + numbers need special handling. */ +#define HANDLE_PSEUDO_NUMBERS 0 +static inline int +is_pseudo_signaling (uint32_t exi, uint32_t hxi) +{ + return 0; +} + +#endif /* nan-pseudo-number.h */ diff --git a/sysdeps/ieee754/ldbl-96/s_issignalingl.c b/sysdeps/ieee754/l= dbl-96/s_issignalingl.c index ec542ad468..37e05aa259 100644 --- a/sysdeps/ieee754/ldbl-96/s_issignalingl.c +++ b/sysdeps/ieee754/ldbl-96/s_issignalingl.c @@ -19,12 +19,19 @@ #include #include #include +#include =20 int __issignalingl (long double x) { uint32_t exi, hxi, lxi; GET_LDOUBLE_WORDS (exi, hxi, lxi, x); + + /* By default we do not recognize a pseudo NaN as sNaN. However on 80= 387 and + later all pseudo numbers including pseudo NaNs result in a signal a= nd are + hence recognized as signaling. */ + int ret =3D is_pseudo_signaling (exi, hxi); + #if HIGH_ORDER_BIT_IS_SET_FOR_SNAN # error not implemented #else @@ -34,11 +41,9 @@ __issignalingl (long double x) hxi ^=3D 0x40000000; /* If lxi !=3D 0, then set any suitable bit of the significand in hxi.= */ hxi |=3D (lxi | -lxi) >> 31; - /* We do not recognize a pseudo NaN as sNaN; they're invalid on 80387 = and - later. */ /* We have to compare for greater (instead of greater or equal), becau= se x's significand being all-zero designates infinity not NaN. */ - return ((exi & 0x7fff) =3D=3D 0x7fff) && (hxi > 0xc0000000); + return ret || (((exi & 0x7fff) =3D=3D 0x7fff) && (hxi > 0xc0000000)); #endif } libm_hidden_def (__issignalingl) diff --git a/sysdeps/x86/fpu/nan-pseudo-number.h b/sysdeps/x86/fpu/nan-ps= eudo-number.h new file mode 100644 index 0000000000..ea43b175a1 --- /dev/null +++ b/sysdeps/x86/fpu/nan-pseudo-number.h @@ -0,0 +1,30 @@ +/* Pseudo-normal number handling. x86 version. + Copyright (C) 2020 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#ifndef NAN_PSEUDO_NUMBER_H +#define NAN_PSEUDO_NUMBER_H 1 + +#define HANDLE_PSEUDO_NUMBERS 1 +/* Pseudo numbers on x86 are always signaling. */ +static inline int +is_pseudo_signaling (uint32_t exi, uint32_t hxi) +{ + return ((exi & 0x7fff) && ((hxi & 0x80000000) =3D=3D 0)); +} + +#endif /* nan-pseudo-number.h */ --=20 2.29.2