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[66.91.136.156]) by smtp.gmail.com with ESMTPSA id u85sm371825qku.42.2017.07.05.17.24.23 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 05 Jul 2017 17:24:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references; bh=KdxOpIn7expYDVmuToYLNLB06Cj4xS3Ky//rBKQoVBo=; b=YAzz8NGDapL62Y2so3A/iRR+eVzFBi4h3d/HAtML20YftYk55Z/rJDjBH0wqDUDnr3 HD+S2GHBRPFaGBCgwOMZeT9gHrAhjfQKDhssMVXgNpq7CCp38TUQwAepd+n9PjlC+NOx /mPyjp0eFtNtNuXAZkubWTbxVqcdPvzSx2DwWvqDrmMyAHpb4SOlqlLM7LYg8pTc6Bmm FHy1s197sRs0jABt/dJDxzmYxVkO9E0Yo+8CWvgGPi8GOMBB0Y48gAcK12moiMOwEt6J enSdKqHGkToXe7TpYW/piLeR3gDZolaSA3WKHHDgL9boT5lpBCSTtW7WDWVgCI8JWHzG PiZw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references; bh=KdxOpIn7expYDVmuToYLNLB06Cj4xS3Ky//rBKQoVBo=; b=EmX2y7beRuubsKn178capJmZPsjKC/DPZWxNoXzs1doU30DlBpchzMdLTWk1FSHOnU SvGh512hPBP9377tVquucTIFloDnmXJD20GXIg11jOspFN5P3kr1RiZsv1U0yB/OSmW6 s9hDBEEn8SFXgT0Tu7+kkzt9GsyVXGPn4fp/2FeZcO0bd/49PZWHo97rPPSFEGj1ErdM pVXL33PaAvBtdjw/RNJ+Q47F2FhRU5VO5JED0rxNpyGYCJ3tUAra/3MxavqXvPXtFecI 7vR95IuTVcCu+rnAOjkobcfklk3HSt0lFNeFcfM2YF3ZbutD3fGtnO30AJdEXAtbm2EC aniA== X-Gm-Message-State: AKS2vOySWMegupPEqO7hOF9HkaFLNNY95XU9jiwLGXHqUFR+iobtroBR 96QReAJZ7JI3PGtrsPg= X-Received: by 10.200.48.38 with SMTP id f35mr56928196qte.88.1499300666553; Wed, 05 Jul 2017 17:24:26 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Wed, 5 Jul 2017 14:23:52 -1000 Message-Id: <20170706002401.10507-3-rth@twiddle.net> X-Mailer: git-send-email 2.9.4 In-Reply-To: <20170706002401.10507-1-rth@twiddle.net> References: <20170706002401.10507-1-rth@twiddle.net> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:400d:c0d::244 Subject: [Qemu-devel] [PATCH 02/11] target/sh4: Consolidate end-of-TB tests X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: bruno@clisp.org, aurelien@aurel32.net Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" We can fold 3 different tests within the decode loop into a more accurate computation of max_insns to start. Signed-off-by: Richard Henderson Reviewed-by: Aurelien Jarno --- target/sh4/translate.c | 29 +++++++++++++++++------------ 1 file changed, 17 insertions(+), 12 deletions(-) diff --git a/target/sh4/translate.c b/target/sh4/translate.c index 6b247fa..e1661e9 100644 --- a/target/sh4/translate.c +++ b/target/sh4/translate.c @@ -1856,7 +1856,6 @@ void gen_intermediate_code(CPUSH4State * env, struct = TranslationBlock *tb) ctx.features =3D env->features; ctx.has_movcal =3D (ctx.tbflags & TB_FLAG_PENDING_MOVCA); =20 - num_insns =3D 0; max_insns =3D tb->cflags & CF_COUNT_MASK; if (max_insns =3D=3D 0) { max_insns =3D CF_COUNT_MASK; @@ -1864,9 +1863,23 @@ void gen_intermediate_code(CPUSH4State * env, struct= TranslationBlock *tb) if (max_insns > TCG_MAX_INSNS) { max_insns =3D TCG_MAX_INSNS; } + /* Since the ISA is fixed-width, we can bound by the number + of instructions remaining on the page. */ + num_insns =3D (TARGET_PAGE_SIZE - (ctx.pc & (TARGET_PAGE_SIZE - 1))) /= 2; + if (max_insns > num_insns) { + max_insns =3D num_insns; + } + /* Single stepping means just that. */ + if (ctx.singlestep_enabled || singlestep) { + max_insns =3D 1; + } =20 gen_tb_start(tb); - while (ctx.bstate =3D=3D BS_NONE && !tcg_op_buf_full()) { + num_insns =3D 0; + + while (ctx.bstate =3D=3D BS_NONE + && num_insns < max_insns + && !tcg_op_buf_full()) { tcg_gen_insn_start(ctx.pc, ctx.envflags); num_insns++; =20 @@ -1890,18 +1903,10 @@ void gen_intermediate_code(CPUSH4State * env, struc= t TranslationBlock *tb) ctx.opcode =3D cpu_lduw_code(env, ctx.pc); decode_opc(&ctx); ctx.pc +=3D 2; - if ((ctx.pc & (TARGET_PAGE_SIZE - 1)) =3D=3D 0) - break; - if (cs->singlestep_enabled) { - break; - } - if (num_insns >=3D max_insns) - break; - if (singlestep) - break; } - if (tb->cflags & CF_LAST_IO) + if (tb->cflags & CF_LAST_IO) { gen_io_end(); + } if (cs->singlestep_enabled) { gen_save_cpu_state(&ctx, true); gen_helper_debug(cpu_env); --=20 2.9.4