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([71.212.131.115]) by smtp.gmail.com with ESMTPSA id w17-20020aa78591000000b0068c5bd3c3b4sm1588933pfn.206.2023.09.14.10.44.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Sep 2023 10:44:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1694713482; x=1695318282; 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=Sa7/YS9CoqDQehByb25wHU0vdLROTPpiwafKH90tB9I=; b=kmMCnoq5aucO6SfslxSP2dVjrPoq5jPfshQJtjSpx/q3UYnx6GMqKlSQSRqyP97zEh XayUnuh9sQs7gXI54nkZJfHOgG7ibYFUwdGqQordUhN2uMrK8pPCTuGhIVn7T6vuc14W qcW0Kk/E5do5uP5g2IcraEccqsq1xQXetzWzAvLJrwN7oyIr5ANSa0hiGGCqhyITJA9X Muaay8fR892yGziG2/sNwDJc/jSMIhcgLU2n81ONqLJ2a9C0TUMeK4TpjUxfOvOoWtBZ jMJg5hv91jFK89yAbGoe6B1v5EqPT1v1F8w2fliDdrvIgEIr0SCI1cf7BwogvEZY3Zkc kSuw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694713482; x=1695318282; 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=Sa7/YS9CoqDQehByb25wHU0vdLROTPpiwafKH90tB9I=; b=IXX0TwJAjqeeUIQZ5qRRbzdZZRn8PBuSqCGK5jDDVokBzeiIdVfw/kqrFvTAG7ByOA 0ido7mERxReZuVmxbEXjbrBW4COrhodH6orct+PGeAmk34AdngcnyD+7yzM/5DQ6meSf +7fe4Upk3PxgQ0jzz6hxBsmXFmwg1B6E6ScUqLhS/RY3omsc01G3ZhliVALsnL0TIb8i IKfkwkIWqCQqYaooIdMUruU76BGnWkwFy++JTU46AAFPj+OsSOR5f2tGkwhm8ZCme6Qf B7h2bQIpvdeo6+qqJi2ycjRrysdDqwwBr5ZaupCRKL9csU+dpzGmdiv8KMsy1ilI6OYs a+Tw== X-Gm-Message-State: AOJu0YyWfgsc+lfqTxWaI5zyEik5PF4RmPJtltlK1xTHwyiGEd6IxS5d q9sF7LAZMz7MIIYEyt8/Bi7lFgAJkYwDQe0UX4w= X-Google-Smtp-Source: AGHT+IG94+fKOKuWBscpNIqXfaX3HtAgXM5tW3T7TwtTKJdlRYE6Tf2id+BxThzJP+Y1EBF74QbCJQ== X-Received: by 2002:a05:6a21:3d85:b0:131:a21:9f96 with SMTP id bj5-20020a056a213d8500b001310a219f96mr5571738pzc.6.1694713481744; Thu, 14 Sep 2023 10:44:41 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: philmd@linaro.org Subject: [PATCH 4/6] accel/tcg: Improve setting of can_do_io at start of TB Date: Thu, 14 Sep 2023 10:44:34 -0700 Message-Id: <20230914174436.1597356-5-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230914174436.1597356-1-richard.henderson@linaro.org> References: <20230914174436.1597356-1-richard.henderson@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=2607:f8b0:4864:20::42c; envelope-from=richard.henderson@linaro.org; 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=ham 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 @linaro.org) X-ZM-MESSAGEID: 1694713577281100003 Content-Type: text/plain; charset="utf-8" Initialize can_do_io to true if this the TB has CF_LAST_IO and will consist of a single instruction. This avoids a set to 0 followed immediately by a set to 1. Signed-off-by: Richard Henderson Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- accel/tcg/translator.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/accel/tcg/translator.c b/accel/tcg/translator.c index 850d82e26f..dd507cd471 100644 --- a/accel/tcg/translator.c +++ b/accel/tcg/translator.c @@ -87,12 +87,12 @@ static TCGOp *gen_tb_start(DisasContextBase *db, uint32= _t cflags) offsetof(ArchCPU, neg.icount_decr.u16.low) - offsetof(ArchCPU, env)); /* - * cpu->can_do_io is cleared automatically here at the beginning of + * cpu->can_do_io is set automatically here at the beginning of * each translation block. The cost is minimal and only paid for * -icount, plus it would be very easy to forget doing it in the * translator. */ - set_can_do_io(db, false); + set_can_do_io(db, db->max_insns =3D=3D 1 && (cflags & CF_LAST_IO)); } =20 return icount_start_insn; --=20 2.34.1