From patchwork Tue Feb 7 08:04:35 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: 9559347 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 06B1F60216 for ; Tue, 7 Feb 2017 08:09:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id ECFE920410 for ; Tue, 7 Feb 2017 08:09:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E1E1923F88; Tue, 7 Feb 2017 08:09:22 +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 64D5320410 for ; Tue, 7 Feb 2017 08:09:22 +0000 (UTC) Received: from localhost ([::1]:52527 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cb0q0-0003Ze-Ve for patchwork-qemu-devel@patchwork.kernel.org; Tue, 07 Feb 2017 03:09:21 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54968) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cb0ll-0000E5-Oe for qemu-devel@nongnu.org; Tue, 07 Feb 2017 03:05:01 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cb0lf-0004tV-ED for qemu-devel@nongnu.org; Tue, 07 Feb 2017 03:04:57 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:32872) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cb0lf-0004rv-67 for qemu-devel@nongnu.org; Tue, 07 Feb 2017 03:04:51 -0500 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v1783qoC059196 for ; Tue, 7 Feb 2017 03:04:50 -0500 Received: from e28smtp04.in.ibm.com (e28smtp04.in.ibm.com [125.16.236.4]) by mx0a-001b2d01.pphosted.com with ESMTP id 28euphr33v-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 07 Feb 2017 03:04:49 -0500 Received: from localhost by e28smtp04.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 7 Feb 2017 13:34:42 +0530 Received: from d28dlp03.in.ibm.com (9.184.220.128) by e28smtp04.in.ibm.com (192.168.1.134) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; Tue, 7 Feb 2017 13:34:40 +0530 Received: from d28relay09.in.ibm.com (d28relay09.in.ibm.com [9.184.220.160]) by d28dlp03.in.ibm.com (Postfix) with ESMTP id 91EFC1258018; Tue, 7 Feb 2017 13:36:29 +0530 (IST) Received: from d28av08.in.ibm.com (d28av08.in.ibm.com [9.184.220.148]) by d28relay09.in.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v1784dmO12517550; Tue, 7 Feb 2017 13:34:39 +0530 Received: from d28av08.in.ibm.com (localhost [127.0.0.1]) by d28av08.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id v1784cgg015904; Tue, 7 Feb 2017 13:34:39 +0530 Received: from bharata.in.ibm.com ([9.124.35.189]) by d28av08.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id v1784bYL015898; Tue, 7 Feb 2017 13:34:37 +0530 From: Bharata B Rao To: qemu-devel@nongnu.org Date: Tue, 7 Feb 2017 13:34:35 +0530 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1486454676-29112-1-git-send-email-bharata@linux.vnet.ibm.com> References: <1486454676-29112-1-git-send-email-bharata@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 17020708-0012-0000-0000-000003B27B7B X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17020708-0013-0000-0000-00001B339186 Message-Id: <1486454676-29112-2-git-send-email-bharata@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-02-07_05:, , 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-1702070081 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.156.1 Subject: [Qemu-devel] [RFC PATCH v1 1/2] 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: peter.maydell@linaro.org, nikunj@linux.vnet.ibm.com, qemu-ppc@nongnu.org, Bharata B Rao , david@gibson.dropbear.id.au, rth@twiddle.net 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 --- 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 c295f31..4a4b50b 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -6109,6 +6109,65 @@ 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 842ec6b..4e99253 100644 --- a/include/fpu/softfloat.h +++ b/include/fpu/softfloat.h @@ -712,6 +712,8 @@ 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);