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([2409:40f0:1023:4bd9:3113:58d5:ddb0:62b9]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82339095c85sm1912676b3a.67.2026.01.25.01.01.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 25 Jan 2026 01:01:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1769331668; x=1769936468; darn=nongnu.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=CgY292WfjndhIqO+oMRoE9wZRdTpGDDfjPVXqtL+d6c=; b=aXLEy1J7pIU5mlH6u787VEIl5+7Mt+FMuNkHXdTffkJCLBORigZPmXgw91q11BTWvp 9uRSYaPoI2tbyFgOOgjlD68+OEsTs6FJbP/dNEWUwdD1GhMoz0h+afNx2ZD+02k7fM4w gd0dyMmVcFfoAb73WVA1sBZJ3Sj10uExyf/PkbO+XzIL58rlcIf8EqjnyPSR5fWSp0+w mUSZ5w4kaEjHtLPGI6sWGuD6HOCGwSOr4WrdPbsN+LF35v5KhoiGq9ZqZE6ryV2n9eKs Up24oRdXLMAjN/lXUJqNCCJulBqMw5IFX6BG1xxu1ZeHjdlZ6G3UbK1s+AIps0LV7lTA XYJw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769331668; x=1769936468; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=CgY292WfjndhIqO+oMRoE9wZRdTpGDDfjPVXqtL+d6c=; b=pNQGsZg0NrfaukcFrpuUj+3jm4CkwFqw0xre/2X05zx+btv2jRSYNevpTaFgE1ZWo/ 1VRfmUqDm09feonqxdoHsfsMfHEkAs8QC0Xcyn01asrMHFgYsZAVXoiXR+ICHoY/CpYf Oqb5UeSwTwGiiX+3Gyxp6VcDuFjvmhhivPPccaF6sOfQuPHz9EIMxYhaxpm49SvrnQU5 Vg9aFN/5JoughIRVKsb0u4yQcOijHSXVp3WGFpcQlcfBnSJqJENRkZ4xphKwewThizFH agfqLr+npsgHSD6ieQmk/5RfuJ/RQmd2kjN3Kd2+JnpZDBSJWaG10feZqtQEKUkdJWzB Yt+Q== X-Gm-Message-State: AOJu0YzAnZL0eegD/2bvFPjktsJdPLh8fKuiFsxNGylsXovLT5QMyo5T 8sphUjjfL5FmptE3aY0q/mdyzUudpjrTJFqAUhC91xE4tVpa2RfJlxHj40JhZQ== X-Gm-Gg: AZuq6aLZ22l+9ZoVOhoqlBJ8ORM5yeHjw14E2L9AfTdWDBiJ93WC0aqayMyVcL1ZGDw SXocxOG6fRLu8ZoL5G+IpF1UzN5HgZURZD9W8kcbnV97jywky8Ygeag3BmBIMDAnIaQlefOOc5Z 4BbfpyKXSeHO6JDIWVR0CRMW7kR9bZJQ9hvQCgs+DRziwvPSIixup2AAf+a6gr2er1+s6NmNUjS qVrJjAPmf5MciYpPGKlmbvkjertKb7tZtEV5FOSwvVpVhmgqBOt58RpYClFvOhvRGz/3KljbNIN +joITUCkUyMOckWtjanpRAwDxvRE0Dy75LN1DzXILsjycWGNQxWzBPxVCJ2NG90O703PI43Nqp3 IcbhjBDiI5kDqlescBnqnLErtngrlHcgDr88bfLbcQPej6gUcSARsA9i/iOtU6G055MA9XA0+Iw nHgKjCjo0lP0XFU00yweFjAQvvhDI9kOYIPh9ui185xw== X-Received: by 2002:a05:6a00:9096:b0:817:9a85:54af with SMTP id d2e1a72fcca58-823412a396cmr973014b3a.43.1769331668177; Sun, 25 Jan 2026 01:01:08 -0800 (PST) From: Ridham Khurana To: qemu-devel@nongnu.org Cc: Ridham Khurana Subject: [PATCH] riscv: correct fractional LMUL legality check in vsetvl Date: Sun, 25 Jan 2026 14:29:34 +0530 Message-ID: <20260125085958.47957-1-khurana.ridham222@gmail.com> X-Mailer: git-send-email 2.49.0 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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::42d; envelope-from=khurana.ridham222@gmail.com; helo=mail-pf1-x42d.google.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 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, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Sun, 25 Jan 2026 09:02:07 -0500 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development 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 @gmail.com) X-ZM-MESSAGEID: 1769349819946154101 --- target/riscv/vector_helper.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c index 2de3358ee8..eff349841a 100644 --- a/target/riscv/vector_helper.c +++ b/target/riscv/vector_helper.c @@ -47,18 +47,12 @@ target_ulong HELPER(vsetvl)(CPURISCVState *env, target_= ulong s1, target_ulong reserved =3D s2 & MAKE_64BIT_MASK(R_VTYPE_RESERVED_SHIFT, xlen - 1 - R_VTYPE_RESERVED_SH= IFT); - uint16_t vlen =3D cpu->cfg.vlenb << 3; int8_t lmul; =20 if (vlmul & 4) { - /* - * Fractional LMUL, check: - * - * VLEN * LMUL >=3D SEW - * VLEN >> (8 - lmul) >=3D sew - * (vlenb << 3) >> (8 - lmul) >=3D sew - */ - if (vlmul =3D=3D 4 || (vlen >> (8 - vlmul)) < sew) { + /* fractional LMUL legality check: LMUL =C3=97 ELEN =E2=89=A5 SEW = */ + int divisor =3D 1 << (8 - vlmul); /* converts encoding into diviso= r for fractional LMUL */ + if (vlmul =3D=3D 4 || cpu->cfg.elen < sew * divisor) { vill =3D true; } } --=20 2.49.0