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[51.210.216.21]) by smtp.gmail.com with ESMTPSA id c9sm13668208pgq.58.2021.10.13.02.37.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Oct 2021 02:37:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20210112.gappssmtp.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=udTBgfMvafWFF2HM9qzUy4cePKbwUTJPgZCDbusCP8U=; b=UIyaj3L+baYDm99H/GroqwM0nslGqnCqXFPFATwF0O6rRw/M8/7q7I9QPtxs3eTUvx F5pqZAFq9jJG3cR36r0M4JRaISOS6JFySX6MLSmjHUxFQaxpUxR6l+4Uyxko1nXCL78L BwizPRT8UlF39aon+G5LEFjRrOg6nLQELUyCM1h2AaRj0GnP1DWoSxL67K++3jebsqEa h4uH9NMGnnNc+/zCXKwXa4vVqTwTHrJ8qzPR/q+RZn5tzCeD5NZLAPO51jcP8j/kr60m Q2AcSJABwzFPUJhFkpCnWBH9LVElaJr7y9OQyYgV2YedSFXqsTifHJHpswAMb6XoxrU8 tG6Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=udTBgfMvafWFF2HM9qzUy4cePKbwUTJPgZCDbusCP8U=; b=Bg2CtPG6WStEm8Ee2TvTj9atAS96LaHKDyScc9eYkXqU0Mf0vVCBMQlWj6xbGnlOUV a2a5HwlqfkzSOYvGaxJv98yvO6NQMV0lHrehGFipde4sJMgZ6LQv1cNp98he8A6QsD/Q BR5AKiK+g6XoeNGUUaAZZ2QAmDS1audT9N/qJZEo/RN8v5NRKPGEmN8IHtyMJiUpDEvi pAGSZxoJa7BTrhjGuVepfXwhVju/p/3VyaOGmrbLCs9MxRIwqOb5tAt5LDAyuU3bzrew hy5vnkhGjqQwbWDE+LPAKlwoOmTFIX9NxTD9G1uSpBZ7EJ/t8vtoy8SW35S5SZ0N1fci ePvg== X-Gm-Message-State: AOAM532lcSAVt1e7CzIArAyC8Wj6GyrK2K2aLX2DaSKWfFL/QoW7psrx YTtNhYOPFyxdM/ApJzRPIKWlNQ== X-Google-Smtp-Source: ABdhPJwaa95Kn/xrswpQdYQX5pzCG8BIM49uyOlnXK2zo3HTvrGRdxDvr5F665aVCEBT3ZlCQHO+2g== X-Received: by 2002:a17:90a:29a4:: with SMTP id h33mr12294332pjd.88.1634117854756; Wed, 13 Oct 2021 02:37:34 -0700 (PDT) From: Vincent Palatin To: philipp.tomsich@vrull.eu, qemu-devel@nongnu.org Subject: [PATCH v1A] target/riscv: fix orc.b instruction in the Zbb extension Date: Wed, 13 Oct 2021 11:37:21 +0200 Message-Id: <20211013093721.1182727-1-vpalatin@rivosinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: 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::62b; envelope-from=vpalatin@rivosinc.com; helo=mail-pl1-x62b.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, 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: Wed, 13 Oct 2021 09:30:50 -0400 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: alistair23@gmail.com, richard.henderson@linaro.org, alistair.francis@opensource.wdc.com, vpalatin@rivosinc.com, peter.maydell@linaro.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1634132197452100001 Content-Type: text/plain; charset="utf-8" The implementation was failing for the following 7 hexadecimal patterns which return one wrong byte (0x00 instead of 0xff): orc.b(0x............01..) =3D 0x............00.. (instead of 0x............= ff..) orc.b(0x..........01....) =3D 0x..........00.... (instead of 0x..........ff= ....) orc.b(0x........01......) =3D 0x........00...... (instead of 0x........ff..= ....) orc.b(0x......01........) =3D 0x......00........ (instead of 0x......ff....= ....) orc.b(0x....01..........) =3D 0x....00.......... (instead of 0x....ff......= ....) orc.b(0x..01............) =3D 0x..00............ (instead of 0x..ff........= ....) orc.b(0x01..............) =3D 0x00.............. (instead of 0xff..........= ....) Try to keep the carry from propagating and triggering the incorrect results. Signed-off-by: Vincent Palatin --- target/riscv/insn_trans/trans_rvb.c.inc | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/target/riscv/insn_trans/trans_rvb.c.inc b/target/riscv/insn_tr= ans/trans_rvb.c.inc index 185c3e9a60..b9fc272789 100644 --- a/target/riscv/insn_trans/trans_rvb.c.inc +++ b/target/riscv/insn_trans/trans_rvb.c.inc @@ -249,11 +249,17 @@ static bool trans_rev8_64(DisasContext *ctx, arg_rev8= _64 *a) static void gen_orc_b(TCGv ret, TCGv source1) { TCGv tmp =3D tcg_temp_new(); + TCGv tmp2 =3D tcg_temp_new(); TCGv ones =3D tcg_constant_tl(dup_const_tl(MO_8, 0x01)); =20 + /* avoid carry propagation */ + tcg_gen_shli_tl(tmp, source1, 1); + tcg_gen_or_tl(tmp, source1, tmp); + tcg_gen_andc_tl(tmp2, tmp, ones); + /* Set lsb in each byte if the byte was zero. */ - tcg_gen_sub_tl(tmp, source1, ones); - tcg_gen_andc_tl(tmp, tmp, source1); + tcg_gen_sub_tl(tmp, tmp2, ones); + tcg_gen_andc_tl(tmp, tmp, tmp2); tcg_gen_shri_tl(tmp, tmp, 7); tcg_gen_andc_tl(tmp, ones, tmp); =20 @@ -261,6 +267,7 @@ static void gen_orc_b(TCGv ret, TCGv source1) tcg_gen_muli_tl(ret, tmp, 0xff); =20 tcg_temp_free(tmp); + tcg_temp_free(tmp2); } =20 static bool trans_orc_b(DisasContext *ctx, arg_orc_b *a) --=20 2.25.1