From nobody Fri Dec 19 20:11:59 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1554155797176127.3638597427016; Mon, 1 Apr 2019 14:56:37 -0700 (PDT) Received: from localhost ([127.0.0.1]:52300 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hB4uq-0004fE-1J for importer@patchew.org; Mon, 01 Apr 2019 17:56:28 -0400 Received: from eggs.gnu.org ([209.51.188.92]:42157) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hB46G-0002tt-5W for qemu-devel@nongnu.org; Mon, 01 Apr 2019 17:04:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hB46E-0004Rj-Qq for qemu-devel@nongnu.org; Mon, 01 Apr 2019 17:04:12 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:52778 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 1hB46E-0004JA-HQ for qemu-devel@nongnu.org; Mon, 01 Apr 2019 17:04:10 -0400 Received: from pps.filterd (m0098417.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x31L3pmx062123 for ; Mon, 1 Apr 2019 17:03:58 -0400 Received: from e15.ny.us.ibm.com (e15.ny.us.ibm.com [129.33.205.205]) by mx0a-001b2d01.pphosted.com with ESMTP id 2rkskgsy1t-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 01 Apr 2019 17:03:54 -0400 Received: from localhost by e15.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 1 Apr 2019 22:02:26 +0100 Received: from b01ledav005.gho.pok.ibm.com (b01ledav005.gho.pok.ibm.com [9.57.199.110]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x31L2P1220447430 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 1 Apr 2019 21:02:25 GMT Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E60F0AE06D; Mon, 1 Apr 2019 21:02:24 +0000 (GMT) Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C1B41AE060; Mon, 1 Apr 2019 21:02:24 +0000 (GMT) Received: from localhost (unknown [9.80.94.43]) by b01ledav005.gho.pok.ibm.com (Postfix) with ESMTP; Mon, 1 Apr 2019 21:02:24 +0000 (GMT) From: Michael Roth To: qemu-devel@nongnu.org Date: Mon, 1 Apr 2019 15:58:37 -0500 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190401210011.16009-1-mdroth@linux.vnet.ibm.com> References: <20190401210011.16009-1-mdroth@linux.vnet.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 x-cbid: 19040121-0068-0000-0000-000003AF1BBF X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010857; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000283; SDB=6.01182941; UDB=6.00619269; IPR=6.00963683; MB=3.00026249; MTD=3.00000008; XFM=3.00000015; UTC=2019-04-01 21:02:28 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19040121-0069-0000-0000-0000480295E9 Message-Id: <20190401210011.16009-4-mdroth@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-04-01_06:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=3 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904010136 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by mx0a-001b2d01.pphosted.com id x31L3pmx062123 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 148.163.158.5 Subject: [Qemu-devel] [PATCH 03/97] target/arm: Reorganize SVE WHILE 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 , Richard Henderson , qemu-stable@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" From: Richard Henderson The pseudocode for this operation is an increment + compare loop, so comparing <=3D the maximum integer produces an all-true predicate. Rather than bound in both the inline code and the helper, pass the helper the number of predicate bits to set instead of the number of predicate elements to set. Reported-by: Laurent Desnogues Signed-off-by: Richard Henderson Reviewed-by: Laurent Desnogues Tested-by: Alex Benn=C3=A9e Tested-by: Laurent Desnogues Message-id: 20180801123111.3595-4-richard.henderson@linaro.org Signed-off-by: Peter Maydell (cherry picked from commit bbd0968c458d48e34a08b8694fa3309a9fe1c9e7) Signed-off-by: Michael Roth --- target/arm/sve_helper.c | 5 ---- target/arm/translate-sve.c | 49 +++++++++++++++++++++++++------------- 2 files changed, 32 insertions(+), 22 deletions(-) diff --git a/target/arm/sve_helper.c b/target/arm/sve_helper.c index 9bd0694d55..87594a8adb 100644 --- a/target/arm/sve_helper.c +++ b/target/arm/sve_helper.c @@ -2846,11 +2846,6 @@ uint32_t HELPER(sve_while)(void *vd, uint32_t count,= uint32_t pred_desc) return flags; } =20 - /* Scale from predicate element count to bits. */ - count <<=3D esz; - /* Bound to the bits in the predicate. */ - count =3D MIN(count, oprsz * 8); - /* Set all of the requested bits. */ for (i =3D 0; i < count / 64; ++i) { d->p[i] =3D esz_mask; diff --git a/target/arm/translate-sve.c b/target/arm/translate-sve.c index 9dd4c38bab..89efc80ee7 100644 --- a/target/arm/translate-sve.c +++ b/target/arm/translate-sve.c @@ -3173,19 +3173,19 @@ static bool trans_CTERM(DisasContext *s, arg_CTERM = *a, uint32_t insn) =20 static bool trans_WHILE(DisasContext *s, arg_WHILE *a, uint32_t insn) { - if (!sve_access_check(s)) { - return true; - } - - TCGv_i64 op0 =3D read_cpu_reg(s, a->rn, 1); - TCGv_i64 op1 =3D read_cpu_reg(s, a->rm, 1); - TCGv_i64 t0 =3D tcg_temp_new_i64(); - TCGv_i64 t1 =3D tcg_temp_new_i64(); + TCGv_i64 op0, op1, t0, t1, tmax; TCGv_i32 t2, t3; TCGv_ptr ptr; unsigned desc, vsz =3D vec_full_reg_size(s); TCGCond cond; =20 + if (!sve_access_check(s)) { + return true; + } + + op0 =3D read_cpu_reg(s, a->rn, 1); + op1 =3D read_cpu_reg(s, a->rm, 1); + if (!a->sf) { if (a->u) { tcg_gen_ext32u_i64(op0, op0); @@ -3198,32 +3198,47 @@ static bool trans_WHILE(DisasContext *s, arg_WHILE = *a, uint32_t insn) =20 /* For the helper, compress the different conditions into a computation * of how many iterations for which the condition is true. - * - * This is slightly complicated by 0 <=3D UINT64_MAX, which is nominal= ly - * 2**64 iterations, overflowing to 0. Of course, predicate registers - * aren't that large, so any value >=3D predicate size is sufficient. */ + t0 =3D tcg_temp_new_i64(); + t1 =3D tcg_temp_new_i64(); tcg_gen_sub_i64(t0, op1, op0); =20 - /* t0 =3D MIN(op1 - op0, vsz). */ - tcg_gen_movi_i64(t1, vsz); - tcg_gen_umin_i64(t0, t0, t1); + tmax =3D tcg_const_i64(vsz >> a->esz); if (a->eq) { /* Equality means one more iteration. */ tcg_gen_addi_i64(t0, t0, 1); + + /* If op1 is max (un)signed integer (and the only time the addition + * above could overflow), then we produce an all-true predicate by + * setting the count to the vector length. This is because the + * pseudocode is described as an increment + compare loop, and the + * max integer would always compare true. + */ + tcg_gen_movi_i64(t1, (a->sf + ? (a->u ? UINT64_MAX : INT64_MAX) + : (a->u ? UINT32_MAX : INT32_MAX))); + tcg_gen_movcond_i64(TCG_COND_EQ, t0, op1, t1, tmax, t0); } =20 - /* t0 =3D (condition true ? t0 : 0). */ + /* Bound to the maximum. */ + tcg_gen_umin_i64(t0, t0, tmax); + tcg_temp_free_i64(tmax); + + /* Set the count to zero if the condition is false. */ cond =3D (a->u ? (a->eq ? TCG_COND_LEU : TCG_COND_LTU) : (a->eq ? TCG_COND_LE : TCG_COND_LT)); tcg_gen_movi_i64(t1, 0); tcg_gen_movcond_i64(cond, t0, op0, op1, t0, t1); + tcg_temp_free_i64(t1); =20 + /* Since we're bounded, pass as a 32-bit type. */ t2 =3D tcg_temp_new_i32(); tcg_gen_extrl_i64_i32(t2, t0); tcg_temp_free_i64(t0); - tcg_temp_free_i64(t1); + + /* Scale elements to bits. */ + tcg_gen_shli_i32(t2, t2, a->esz); =20 desc =3D (vsz / 8) - 2; desc =3D deposit32(desc, SIMD_DATA_SHIFT, 2, a->esz); --=20 2.17.1