From nobody Sun Sep 28 17:06:27 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=reject dis=none) header.from=sifive.com ARC-Seal: i=1; a=rsa-sha256; t=1757925854; cv=none; d=zohomail.com; s=zohoarc; b=aGgLaDh/Euewwwv80ptt89HIt1HdIuFeAWQp2cO1RvKHfJYHd/xrTHglG66TvVTcGuBtxiXoZQxGU6GCbqRAESLdRBLzb4LnhHu8xWSuUrlcDssqjl/FcBNfK40DC7BdoYh2eJG3mFCAvT2D5ARcNtcotNKycakPky4KJ28HDe0= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1757925854; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=512SNwG/42h2YVFM//EPeL3wCt1vmEMWdeuDeCr6XOw=; b=hm2K0VisUJnIegjozr3IjeadiU5cEoWO5vdQZV2bAhxJz0i9H9dWX/JyYLY/MpbN1YsbyJGt49lcxeEn70p78D/aPl3JeyjJBj5wwG8GhDKYu5Xw5RYoQpMYjfZOehZgShd0Xadep1bzqG1Ef7QoDJEnI63VgPYX7tdUP12LuEo= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=reject dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1757925854084410.8969595781298; Mon, 15 Sep 2025 01:44:14 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uy4mO-00081h-2z; Mon, 15 Sep 2025 04:41:45 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uy4mF-0007il-Nu for qemu-devel@nongnu.org; Mon, 15 Sep 2025 04:41:36 -0400 Received: from mail-pf1-x42c.google.com ([2607:f8b0:4864:20::42c]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1uy4lt-0002QN-5f for qemu-devel@nongnu.org; Mon, 15 Sep 2025 04:41:33 -0400 Received: by mail-pf1-x42c.google.com with SMTP id d2e1a72fcca58-772627dd50aso5594766b3a.1 for ; Mon, 15 Sep 2025 01:41:10 -0700 (PDT) Received: from duncan.localdomain (114-35-142-126.hinet-ip.hinet.net. [114.35.142.126]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-26295996ff6sm55852045ad.64.2025.09.15.01.41.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Sep 2025 01:41:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; t=1757925668; x=1758530468; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=512SNwG/42h2YVFM//EPeL3wCt1vmEMWdeuDeCr6XOw=; b=hsWaG110Tr/+1APCn+Z1oU+Nfzc2BV6YGoInurvARb8KvsfIdO47/oKDX1zBNCvRke L8aln72Eh2nrrN6fDDHY8gdmAwZuce3najB8TyqlFIhG0AQzoDB9qDVX6PcewOntIz8c ZTwK+RTPS1BGgAfQ4wK07pr6NgNSE8aiRDux8ahnkC0WlWldUSu5Ig21+5/1I/7ggYH5 5ZXzYyVx1YOa2Wbz2q5tEiOkWJn4LkKfskMRrQUkxZJcR8Af2zN2rWPMPGnsvJyZaovl 4WGGS76CIGy6Vl7zUIiIbSSk5GxKlrKac8RIxME4zf9sTUv42ffryupvoPn2OXHHl2ZA /4tg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757925668; x=1758530468; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=512SNwG/42h2YVFM//EPeL3wCt1vmEMWdeuDeCr6XOw=; b=G+RWGDQcsebbBwcbf+z5W+0WMgKt0RbgWLXCxQEvmpLdXoeaUTFaUdDTMm3btrWvHW 9X2QZPelRidfdAz6/aIK2WP09unNeoohW/HBCCXPisTDIS/zamojffq8QBJLQTg9Godq JGhD+qu/jcZz5WWoaU85CCasNLuNQg7mgX2oNsrUU2ZRSPL5+e9UUvBnsNqNtJW7ihb1 1+by24jvF01cX0LFMIXdBH4Oqdtmav3Yz9JSwxuU28VSqk1EXA+kvv9Q60UxOly0b0dT tw9Jjg3iLBe27gzg/QU/qGbKa9yN4bHWAKRhubq5tndCf0gqheB3Kl7UuKRhw9ftKmf9 579Q== X-Gm-Message-State: AOJu0YwzC+Lh35Or5Ukt67NnS54yfINTwk55dNF0ASLKnGpoFacMm8wU sjFRGRSC7AYuQahhluGTIbyfy75/OuHoUagi+EKkErKDI6dYLRnBnXxTAXV0Go6RIbs4wVSY69I 5DLRek19EIxWIHGuUaEahc9ak4V+CAK3sEmHdrEwUOwmp+GWVXuQwKx8XZ240ugRmzEgA0Sub70 oaC/jODSwL7Mu+6V+21BO780lwUnf/UZksN9MyOozMxQ== X-Gm-Gg: ASbGnctsK3rYLc4rVrAwZvKrNei7QDg78wnqKm164gfKZRZZGJN89oE9/OPFfExokQX x5mQ+G6ncnA/XKjg8uEtm4l7+5TIQxUa9mRMlf742UgBoG6TfGUwXmTmBV7xeIuwIVqn1CJanH5 o3Bnoo9flainri5fdfDYHGBUVHf9ly+UIbUTP96e7uPOUJqh9Wg9axRNna6iwW9m6RPrwXBvXmu C+ESl5uWtRR+BDcbYxwZxe7pw3Nz59eBNi52x3ULHiNCtI9K2XIAD+Z8JLDm63eDR/uyXMTYXDv b1j9sNO5sysRIHkmSQoJlVCZgRBQSueooes8zbpEvEd/HYi3YR4OcC5eAA2GsvnE9WYTGkeHvI5 55IzPveb/wGXUzAbsdjS/8WDiuXRHuRTeqFrltFdVAPGzUBKHOudDGjt0eC/IWWsBJV3Ol5Kl3q qjSA== X-Google-Smtp-Source: AGHT+IFoDLndtxzmRjFmPNgqUmSrx8zHVIqUFQdp3DCFdYMLVkCo8j8khTc7kBxGeNWoTrQ9LMlZZw== X-Received: by 2002:a17:902:d507:b0:24b:270e:56d4 with SMTP id d9443c01a7336-25d2a11abefmr139836035ad.4.1757925667933; Mon, 15 Sep 2025 01:41:07 -0700 (PDT) From: Max Chou To: qemu-devel@nongnu.org, qemu-riscv@nongnu.org Cc: Palmer Dabbelt , Alistair Francis , Weiwei Li , Daniel Henrique Barboza , Liu Zhiwei , Max Chou Subject: [RFC PATCH 6/8] target/riscv: Introduce BF16 canonical NaN for Zvfbfa extension Date: Mon, 15 Sep 2025 16:40:34 +0800 Message-ID: <20250915084037.1816893-7-max.chou@sifive.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250915084037.1816893-1-max.chou@sifive.com> References: <20250915084037.1816893-1-max.chou@sifive.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.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; Received-SPF: pass client-ip=2607:f8b0:4864:20::42c; envelope-from=max.chou@sifive.com; helo=mail-pf1-x42c.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @sifive.com) X-ZM-MESSAGEID: 1757925856340116601 Content-Type: text/plain; charset="utf-8" According to the Zvfbfa ISA spec (v0.1), improperly NaN-boxed f-register operands must substitute the BF16 canonical NaN instead of the FP16 canonical NaN for some vector floating-point instructions. Signed-off-by: Max Chou --- target/riscv/insn_trans/trans_rvv.c.inc | 18 +++++++++--------- target/riscv/translate.c | 8 ++++++++ 2 files changed, 17 insertions(+), 9 deletions(-) diff --git a/target/riscv/insn_trans/trans_rvv.c.inc b/target/riscv/insn_tr= ans/trans_rvv.c.inc index 71f98fb350b..62cc03784cb 100644 --- a/target/riscv/insn_trans/trans_rvv.c.inc +++ b/target/riscv/insn_trans/trans_rvv.c.inc @@ -2347,17 +2347,17 @@ GEN_OPIWI_NARROW_TRANS(vnclip_wi, IMM_ZX, vnclip_wx) */ static void do_nanbox(DisasContext *s, TCGv_i64 out, TCGv_i64 in) { - switch (s->sew) { - case 1: - gen_check_nanbox_h(out, in); - break; - case 2: + if (s->sew =3D=3D MO_16) { + if (s->altfmt) { + gen_check_nanbox_h_bf16(out, in); + } else { + gen_check_nanbox_h(out, in); + } + } else if (s->sew =3D=3D MO_32) { gen_check_nanbox_s(out, in); - break; - case 3: + } else if (s->sew =3D=3D MO_64) { tcg_gen_mov_i64(out, in); - break; - default: + } else { g_assert_not_reached(); } } diff --git a/target/riscv/translate.c b/target/riscv/translate.c index 8ad147946c9..d99b58629d0 100644 --- a/target/riscv/translate.c +++ b/target/riscv/translate.c @@ -201,6 +201,14 @@ static void gen_check_nanbox_h(TCGv_i64 out, TCGv_i64 = in) tcg_gen_movcond_i64(TCG_COND_GEU, out, in, t_max, in, t_nan); } =20 +static void gen_check_nanbox_h_bf16(TCGv_i64 out, TCGv_i64 in) +{ + TCGv_i64 t_max =3D tcg_constant_i64(0xffffffffffff0000ull); + TCGv_i64 t_nan =3D tcg_constant_i64(0xffffffffffff7fc0ull); + + tcg_gen_movcond_i64(TCG_COND_GEU, out, in, t_max, in, t_nan); +} + static void gen_check_nanbox_s(TCGv_i64 out, TCGv_i64 in) { TCGv_i64 t_max =3D tcg_constant_i64(0xffffffff00000000ull); --=20 2.43.0