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[81.2.115.148]) by smtp.gmail.com with ESMTPSA id j6sm9827443wrm.97.2021.07.13.06.37.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Jul 2021 06:37:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=k6grFFqHPB3tF2ojR0KuBO/NFzUsEvLnrBSRggUNVfs=; b=jN1Sbx1VY9KoDtcdpRFKvgdmKxbzlK32P+heZlXMenNUzJaIIYmthJkFo2AqBd27xa mlbsFs/Wice4pEIlCSNEc3CT7GTRxOu/CchTGAOlfeaGi7cYTQGSE/AAmEXFsNJeTOPs zpDda8v1mvRdElHuEvayjttRDcDPfczPrF2Gm/sp4NovMv2ob9pHKOBdJkm5Znwi+47y TDv2mXhq//qnX9WC4+MOlfxPP/NZOdmyVuCMIOwKU+56yOewEqUGCZZh2y2LrR3EePVn JQe1bKbOrA+hJHMwLHpbiuraagoQM5LdutRoneYzVo8fw/liP6Re6hr05lsWx25dqboo 7HvQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=k6grFFqHPB3tF2ojR0KuBO/NFzUsEvLnrBSRggUNVfs=; b=KK535vjwzyP0uvUDB9PCJxVIIi9Om62Opxyz9wk3uwXI1WWv5c671KRNCDpC3if/1E SMvyBwap+y97YWOwG4bEGBWOaX7m5HuoYUYM7HrS9nZXe38D5WURXtjJDIU36D51Weye Ttx9y47TnhGMm+zK7svxXbHIp2i6cGjT3HWaU65//qei+VYtAMKPT8s6cSyWlzFGSwYI aHA7MSp1NPpfIW2HV37EkS6yYI0wSOMZ89MFJSTlFyQQaqWu9OPCQnc1wlAOIXsiCO6p loYER/dqIgGRr2QGOLHaZwd2H2St7wjkafQ9Vve1Wil+11QT31TTKjpiTGhsvbIooJDX DlOA== X-Gm-Message-State: AOAM531lsjv+4cROu+iPLAfibXZg/8pKf8X649qdWwTxKyfBRzxop8TJ w5HeR99YpqNsopjqv2Ta/BcFeg== X-Google-Smtp-Source: ABdhPJzAnvVu6/SF3bfB9J5GrcKSmVepVqxP+gwQ0e6uk5SsUa0desiOHBw26qJT668icl0omjrV0w== X-Received: by 2002:a5d:4a0b:: with SMTP id m11mr5853166wrq.210.1626183454587; Tue, 13 Jul 2021 06:37:34 -0700 (PDT) From: Peter Maydell To: qemu-arm@nongnu.org, qemu-devel@nongnu.org Subject: [PATCH for-6.2 07/34] target/arm: Fix calculation of LTP mask when LR is 0 Date: Tue, 13 Jul 2021 14:36:59 +0100 Message-Id: <20210713133726.26842-8-peter.maydell@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210713133726.26842-1-peter.maydell@linaro.org> References: <20210713133726.26842-1-peter.maydell@linaro.org> 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=2a00:1450:4864:20::42c; envelope-from=peter.maydell@linaro.org; helo=mail-wr1-x42c.google.com X-Spam_score_int: -1 X-Spam_score: -0.2 X-Spam_bar: / X-Spam_report: (-0.2 / 5.0 requ) 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=ham autolearn_force=no X-Spam_action: no action 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1626183826202100001 Content-Type: text/plain; charset="utf-8" In mve_element_mask(), we calculate a mask for tail predication which should have a number of 1 bits based on the value of LR. However, our MAKE_64BIT_MASK() macro has undefined behaviour when passed a zero length. Special case this to give the all-zeroes mask we require. Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson --- target/arm/mve_helper.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c index f17e5a413fd..c75432c5fef 100644 --- a/target/arm/mve_helper.c +++ b/target/arm/mve_helper.c @@ -64,7 +64,8 @@ static uint16_t mve_element_mask(CPUARMState *env) */ int masklen =3D env->regs[14] << env->v7m.ltpsize; assert(masklen <=3D 16); - mask &=3D MAKE_64BIT_MASK(0, masklen); + uint16_t ltpmask =3D masklen ? MAKE_64BIT_MASK(0, masklen) : 0; + mask &=3D ltpmask; } =20 if ((env->condexec_bits & 0xf) =3D=3D 0) { --=20 2.20.1