From patchwork Fri Jun 3 18:43:10 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aleksandar Markovic X-Patchwork-Id: 9153905 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id F3C8D6082E for ; Fri, 3 Jun 2016 18:45:15 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E9CE428304 for ; Fri, 3 Jun 2016 18:45:15 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DEB0B28336; Fri, 3 Jun 2016 18:45:15 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 664D428304 for ; Fri, 3 Jun 2016 18:45:15 +0000 (UTC) Received: from localhost ([::1]:57191 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b8u5q-0001sp-JF for patchwork-qemu-devel@patchwork.kernel.org; Fri, 03 Jun 2016 14:45:14 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42066) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b8u5L-0001pc-1B for qemu-devel@nongnu.org; Fri, 03 Jun 2016 14:44:44 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1b8u5E-0007Tw-Tq for qemu-devel@nongnu.org; Fri, 03 Jun 2016 14:44:41 -0400 Received: from mx2.rt-rk.com ([89.216.37.149]:39746 helo=mail.rt-rk.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b8u5E-0007TS-N5 for qemu-devel@nongnu.org; Fri, 03 Jun 2016 14:44:36 -0400 Received: from localhost (localhost [127.0.0.1]) by mail.rt-rk.com (Postfix) with ESMTP id BB0791A47B6; Fri, 3 Jun 2016 20:44:34 +0200 (CEST) X-Virus-Scanned: amavisd-new at rt-rk.com Received: from rtrkw197-lin.domain.local (rtrkw197-lin.domain.local [10.10.13.82]) by mail.rt-rk.com (Postfix) with ESMTPSA id A3CD31A47B0; Fri, 3 Jun 2016 20:44:34 +0200 (CEST) From: Aleksandar Markovic To: qemu-devel@nongnu.org, leon.alrae@imgtec.com, petar.jovanovic@imgtec.com, miodrag.dinic@imgtec.com, aleksandar.markovic@imgtec.com Date: Fri, 3 Jun 2016 20:43:10 +0200 Message-Id: <1464979398-16838-5-git-send-email-aleksandar.markovic@rt-rk.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1464979398-16838-1-git-send-email-aleksandar.markovic@rt-rk.com> References: <1464979398-16838-1-git-send-email-aleksandar.markovic@rt-rk.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 89.216.37.149 Subject: [Qemu-devel] [PATCH v8 4/9] softfloat: For Mips only, correct order in pickNaNMulAdd() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Aleksandar Markovic Only for Mips platform, and only for cases when snan_bit_is_one is 0, correct the order of argument comparisons in pickNaNMulAdd(). For more info, see [1], page 53, section "3.5.3 NaN Propagation". [1] "MIPS Architecture for Programmers Volume IV-j: The MIPS32 SIMD Architecture Module", Imagination Technologies LTD, Revision 1.12, February 3, 2016 Reviewed-by: Leon Alrae Signed-off-by: Aleksandar Markovic --- fpu/softfloat-specialize.h | 41 +++++++++++++++++++++++++++++------------ 1 file changed, 29 insertions(+), 12 deletions(-) diff --git a/fpu/softfloat-specialize.h b/fpu/softfloat-specialize.h index 093218f..11fc66b 100644 --- a/fpu/softfloat-specialize.h +++ b/fpu/softfloat-specialize.h @@ -571,19 +571,36 @@ static int pickNaNMulAdd(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN, return 3; } - /* Prefer sNaN over qNaN, in the a, b, c order. */ - if (aIsSNaN) { - return 0; - } else if (bIsSNaN) { - return 1; - } else if (cIsSNaN) { - return 2; - } else if (aIsQNaN) { - return 0; - } else if (bIsQNaN) { - return 1; + if (status->snan_bit_is_one) { + /* Prefer sNaN over qNaN, in the c, a, b order. */ + if (cIsSNaN) { + return 2; + } else if (aIsSNaN) { + return 0; + } else if (bIsSNaN) { + return 1; + } else if (cIsQNaN) { + return 2; + } else if (aIsQNaN) { + return 0; + } else { + return 1; + } } else { - return 2; + /* Prefer sNaN over qNaN, in the a, b, c order. */ + if (aIsSNaN) { + return 0; + } else if (bIsSNaN) { + return 1; + } else if (cIsSNaN) { + return 2; + } else if (aIsQNaN) { + return 0; + } else if (bIsQNaN) { + return 1; + } else { + return 2; + } } } #elif defined(TARGET_PPC)