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status=Fix Released; importance=Undecided; assignee=frankchang0125@gmail.com; X-Launchpad-Bug-Tags: riscv vector X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: alistair2323 frankchang0125 tony-cole X-Launchpad-Bug-Reporter: Tony Cole (tony-cole) X-Launchpad-Bug-Modifier: Thomas Huth (th-huth) References: <161832726983.9430.3755052950345832110.malonedeb@chaenomeles.canonical.com> Message-Id: <162987591341.16167.2833824027594585075.launchpad@gac.canonical.com> Subject: [Bug 1923629] Re: RISC-V Vector Instruction vssub.vv not saturating X-Launchpad-Message-Rationale: Subscriber (QEMU) @qemu-devel-ml X-Launchpad-Message-For: qemu-devel-ml Precedence: bulk X-Generated-By: Launchpad (canonical.com); Revision="7edb2d45353e030166106ae05838b77ab406edcd"; Instance="production" X-Launchpad-Hash: a5eed2f50ae1bf7ef34e37b79843c8bc870fe3f8 Received-SPF: pass client-ip=185.125.188.250; envelope-from=noreply@launchpad.net; helo=smtp-relay-services-0.canonical.com X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Bug 1923629 <1923629@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" ** Changed in: qemu Status: Fix Committed =3D> Fix Released --=20 You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1923629 Title: RISC-V Vector Instruction vssub.vv not saturating Status in QEMU: Fix Released Bug description: I noticed doing a negate ( 0 =E2=80=93 0x80000000 ) using vssub.vv produc= es an incorrect result of 0x80000000 (should saturate to 0x7FFFFFFF). Here is the bit of the code: vmv.v.i v16, 0 =E2=80=A6 8f040457 vssub.vv v8,v16,v8 I believe the instruction encoding is correct (vssub.vv with vd =3D v8, vs2 =3D v16, rs1 =3D v8), but the result does not saturate in QEMU. I=E2=80=99ve just tested with what I think is the latest branch ( https://github.com/sifive/qemu/tree/rvv-1.0-upstream-v7 commit 26 Feb 2021: 1151361fa7d45cc90d69086ccf1a4d8397931811 ) and the problem still exists. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1923629/+subscriptions