From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 18E99C433EF for ; Wed, 15 Dec 2021 18:12:51 +0000 (UTC) Received: from localhost ([::1]:43218 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mxYlm-0003SN-VR for qemu-devel@archiver.kernel.org; Wed, 15 Dec 2021 13:12:50 -0500 Received: from eggs.gnu.org ([209.51.188.92]:39168) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mxXi9-0004bW-Go; Wed, 15 Dec 2021 12:05:01 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:21126) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mxXi7-0004gA-Cu; Wed, 15 Dec 2021 12:05:01 -0500 Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1BFGfcMn014285; Wed, 15 Dec 2021 17:04:34 GMT Received: from ppma03fra.de.ibm.com (6b.4a.5195.ip4.static.sl-reverse.com [149.81.74.107]) by mx0a-001b2d01.pphosted.com with ESMTP id 3cyfdnyype-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 15 Dec 2021 17:04:34 +0000 Received: from pps.filterd (ppma03fra.de.ibm.com [127.0.0.1]) by ppma03fra.de.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 1BFH42n2000835; Wed, 15 Dec 2021 17:04:32 GMT Received: from b06avi18878370.portsmouth.uk.ibm.com (b06avi18878370.portsmouth.uk.ibm.com [9.149.26.194]) by ppma03fra.de.ibm.com with ESMTP id 3cy7k975tb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 15 Dec 2021 17:04:31 +0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 1BFH4TuK17039622 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 15 Dec 2021 17:04:29 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 896504C046; Wed, 15 Dec 2021 17:04:29 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4F51A4C059; Wed, 15 Dec 2021 17:04:29 +0000 (GMT) Received: from smtp.tlslab.ibm.com (unknown [9.101.4.1]) by d06av22.portsmouth.uk.ibm.com (Postfix) with SMTP; Wed, 15 Dec 2021 17:04:29 +0000 (GMT) Received: from yukon.home (unknown [9.171.19.61]) by smtp.tlslab.ibm.com (Postfix) with ESMTP id 98456220247; Wed, 15 Dec 2021 18:04:28 +0100 (CET) From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= To: qemu-ppc@nongnu.org, qemu-devel@nongnu.org Subject: [PULL 051/102] target/ppc: Add helper for frsqrtes Date: Wed, 15 Dec 2021 18:03:06 +0100 Message-Id: <20211215170357.321643-39-clg@kaod.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211215170357.321643-1-clg@kaod.org> References: <20211215165847.321042-1-clg@kaod.org> <20211215170357.321643-1-clg@kaod.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: _-_z6W2h6Y1tS2Di4pvS3FCY6tIvjL7n X-Proofpoint-ORIG-GUID: _-_z6W2h6Y1tS2Di4pvS3FCY6tIvjL7n X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-15_10,2021-12-14_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1034 lowpriorityscore=0 mlxlogscore=999 adultscore=0 priorityscore=1501 phishscore=0 malwarescore=0 spamscore=0 impostorscore=0 bulkscore=0 mlxscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112150098 Received-SPF: softfail client-ip=148.163.156.1; envelope-from=clg@kaod.org; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -11 X-Spam_score: -1.2 X-Spam_bar: - X-Spam_report: (-1.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_SOFTFAIL=0.665 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Richard Henderson , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Richard Henderson There is no double-rounding bug here, because the result is merely an estimate to within 1 part in 32, but perform the operation with float64r32_div for consistency. Signed-off-by: Richard Henderson Message-Id: <20211119160502.17432-33-richard.henderson@linaro.org> Signed-off-by: C=C3=A9dric Le Goater --- target/ppc/helper.h | 1 + target/ppc/fpu_helper.c | 19 +++++++++++++++++++ target/ppc/translate/fp-impl.c.inc | 3 +-- 3 files changed, 21 insertions(+), 2 deletions(-) diff --git a/target/ppc/helper.h b/target/ppc/helper.h index f70a3aefcbf4..48774fab1917 100644 --- a/target/ppc/helper.h +++ b/target/ppc/helper.h @@ -114,6 +114,7 @@ DEF_HELPER_2(fsqrts, f64, env, f64) DEF_HELPER_2(fre, i64, env, i64) DEF_HELPER_2(fres, i64, env, i64) DEF_HELPER_2(frsqrte, i64, env, i64) +DEF_HELPER_2(frsqrtes, i64, env, i64) DEF_HELPER_4(fsel, i64, env, i64, i64, i64) =20 DEF_HELPER_FLAGS_2(ftdiv, TCG_CALL_NO_RWG_SE, i32, i64, i64) diff --git a/target/ppc/fpu_helper.c b/target/ppc/fpu_helper.c index 4acc557c088a..83c8f2556cc7 100644 --- a/target/ppc/fpu_helper.c +++ b/target/ppc/fpu_helper.c @@ -896,6 +896,25 @@ float64 helper_frsqrte(CPUPPCState *env, float64 arg= ) return retd; } =20 +/* frsqrtes - frsqrtes. */ +float64 helper_frsqrtes(CPUPPCState *env, float64 arg) +{ + /* "Estimate" the reciprocal with actual division. */ + float64 rets =3D float64_sqrt(arg, &env->fp_status); + float64 retd =3D float64r32_div(float64_one, rets, &env->fp_status); + int flags =3D get_float_exception_flags(&env->fp_status); + + if (unlikely(flags & float_flag_invalid)) { + float_invalid_op_sqrt(env, flags, 1, GETPC()); + } + if (unlikely(flags & float_flag_divbyzero)) { + /* Reciprocal of (square root of) zero. */ + float_zero_divide_excp(env, GETPC()); + } + + return retd; +} + /* fsel - fsel. */ uint64_t helper_fsel(CPUPPCState *env, uint64_t arg1, uint64_t arg2, uint64_t arg3) diff --git a/target/ppc/translate/fp-impl.c.inc b/target/ppc/translate/fp= -impl.c.inc index bf56e35cb686..2baae5988fde 100644 --- a/target/ppc/translate/fp-impl.c.inc +++ b/target/ppc/translate/fp-impl.c.inc @@ -212,8 +212,7 @@ static void gen_frsqrtes(DisasContext *ctx) t1 =3D tcg_temp_new_i64(); gen_reset_fpstatus(); get_fpr(t0, rB(ctx->opcode)); - gen_helper_frsqrte(t1, cpu_env, t0); - gen_helper_frsp(t1, cpu_env, t1); + gen_helper_frsqrtes(t1, cpu_env, t0); set_fpr(rD(ctx->opcode), t1); gen_compute_fprf_float64(t1); if (unlikely(Rc(ctx->opcode) !=3D 0)) { --=20 2.31.1