From patchwork Fri Feb 10 07:23:06 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bharata B Rao X-Patchwork-Id: 9566041 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 D2682602B6 for ; Fri, 10 Feb 2017 07:25:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BD2E72852A for ; Fri, 10 Feb 2017 07:25:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AEDFA28545; Fri, 10 Feb 2017 07:25:03 +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 012E52852A for ; Fri, 10 Feb 2017 07:25:03 +0000 (UTC) Received: from localhost ([::1]:42288 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cc5Zm-0007H3-1u for patchwork-qemu-devel@patchwork.kernel.org; Fri, 10 Feb 2017 02:25:02 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60147) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cc5Z9-0007Eo-JZ for qemu-devel@nongnu.org; Fri, 10 Feb 2017 02:24:24 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cc5Z6-0000Lv-G1 for qemu-devel@nongnu.org; Fri, 10 Feb 2017 02:24:23 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:41787 helo=mx0a-001b2d01.pphosted.com) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cc5Z6-0000LP-9a for qemu-devel@nongnu.org; Fri, 10 Feb 2017 02:24:20 -0500 Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v1A7IwG2030613 for ; Fri, 10 Feb 2017 02:24:19 -0500 Received: from e23smtp07.au.ibm.com (e23smtp07.au.ibm.com [202.81.31.140]) by mx0b-001b2d01.pphosted.com with ESMTP id 28gr4efb6b-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Fri, 10 Feb 2017 02:24:19 -0500 Received: from localhost by e23smtp07.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Fri, 10 Feb 2017 17:24:13 +1000 Received: from d23relay07.au.ibm.com (d23relay07.au.ibm.com [9.190.26.37]) by d23dlp01.au.ibm.com (Postfix) with ESMTP id 1E74B2CE8054; Fri, 10 Feb 2017 18:24:13 +1100 (EST) Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97]) by d23relay07.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v1A7O5uQ27525130; Fri, 10 Feb 2017 18:24:13 +1100 Received: from d23av03.au.ibm.com (localhost [127.0.0.1]) by d23av03.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id v1A7Nefv023572; Fri, 10 Feb 2017 18:23:40 +1100 Received: from bharata.in.ibm.com ([9.77.205.48]) by d23av03.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id v1A7NYCr023032; Fri, 10 Feb 2017 18:23:38 +1100 From: Bharata B Rao To: qemu-devel@nongnu.org Date: Fri, 10 Feb 2017 12:53:06 +0530 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1486711391-12247-1-git-send-email-bharata@linux.vnet.ibm.com> References: <1486711391-12247-1-git-send-email-bharata@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 17021007-0044-0000-0000-000002290670 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17021007-0045-0000-0000-000006825528 Message-Id: <1486711391-12247-3-git-send-email-bharata@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-02-10_02:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1612050000 definitions=main-1702100074 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.158.5 Subject: [Qemu-devel] [PATCH 2/7] softfloat: Add float128_to_uint64_round_to_zero() 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: , Cc: rth@twiddle.net, qemu-ppc@nongnu.org, Bharata B Rao , nikunj@linux.vnet.ibm.com, david@gibson.dropbear.id.au Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Implement float128_to_uint64() and use that to implement float128_to_uint64_round_to_zero() This is required by xscvqpudz instruction of PowerPC ISA 3.0. Signed-off-by: Bharata B Rao Reviewed-by: Peter Maydell --- Ealier posted separately at: https://lists.nongnu.org/archive/html/qemu-devel/2017-02/msg01326.html fpu/softfloat.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++ include/fpu/softfloat.h | 2 ++ 2 files changed, 61 insertions(+) diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 5ccba76..47e4646 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -6128,6 +6128,65 @@ int64_t float128_to_int64_round_to_zero(float128 a, float_status *status) } /*---------------------------------------------------------------------------- +| Returns the result of converting the quadruple-precision floating-point value +| `a' to the 64-bit unsigned integer format. The conversion is +| performed according to the IEC/IEEE Standard for Binary Floating-Point +| Arithmetic---which means in particular that the conversion is rounded +| according to the current rounding mode. If `a' is a NaN, the largest +| positive integer is returned. If the conversion overflows, the +| largest unsigned integer is returned. If 'a' is negative, the value is +| rounded and zero is returned; negative values that do not round to zero +| will raise the inexact exception. +*----------------------------------------------------------------------------*/ + +uint64_t float128_to_uint64(float128 a, float_status *status) +{ + flag aSign; + int aExp; + int shiftCount; + uint64_t aSig0, aSig1; + + aSig0 = extractFloat128Frac0(a); + aSig1 = extractFloat128Frac1(a); + aExp = extractFloat128Exp(a); + aSign = extractFloat128Sign(a); + if (aSign && (aExp > 0x3FFE)) { + float_raise(float_flag_invalid, status); + if (float128_is_any_nan(a)) { + return LIT64(0xFFFFFFFFFFFFFFFF); + } else { + return 0; + } + } + if (aExp) { + aSig0 |= LIT64(0x0001000000000000); + } + shiftCount = 0x402F - aExp; + if (shiftCount <= 0) { + if (0x403E < aExp) { + float_raise(float_flag_invalid, status); + return LIT64(0xFFFFFFFFFFFFFFFF); + } + shortShift128Left(aSig0, aSig1, -shiftCount, &aSig0, &aSig1); + } else { + shift64ExtraRightJamming(aSig0, aSig1, shiftCount, &aSig0, &aSig1); + } + return roundAndPackUint64(aSign, aSig0, aSig1, status); +} + +uint64_t float128_to_uint64_round_to_zero(float128 a, float_status *status) +{ + uint64_t v; + signed char current_rounding_mode = status->float_rounding_mode; + + set_float_rounding_mode(float_round_to_zero, status); + v = float128_to_uint64(a, status); + set_float_rounding_mode(current_rounding_mode, status); + + return v; +} + +/*---------------------------------------------------------------------------- | Returns the result of converting the quadruple-precision floating-point | value `a' to the single-precision floating-point format. The conversion | is performed according to the IEC/IEEE Standard for Binary Floating-Point diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h index 8a39028..a09ad0e 100644 --- a/include/fpu/softfloat.h +++ b/include/fpu/softfloat.h @@ -714,6 +714,8 @@ int32_t float128_to_int32(float128, float_status *status); int32_t float128_to_int32_round_to_zero(float128, float_status *status); int64_t float128_to_int64(float128, float_status *status); int64_t float128_to_int64_round_to_zero(float128, float_status *status); +uint64_t float128_to_uint64(float128, float_status *status); +uint64_t float128_to_uint64_round_to_zero(float128, float_status *status); float32 float128_to_float32(float128, float_status *status); float64 float128_to_float64(float128, float_status *status); floatx80 float128_to_floatx80(float128, float_status *status);