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[97.113.165.157]) by smtp.gmail.com with ESMTPSA id 34sm10959480qtp.17.2017.06.13.22.23.25 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 13 Jun 2017 22:23:25 -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=0JIyMTWEbgKNU/nXeGzvw+nCv+LbCnygH0rtWYHqaiw=; b=iniXKNOcU7o+09rkD/S88MmLDRrZHpoWaUPajItcryPkBaEo3/ycS0MWuZ3axs/MRR FMTn/2DuQoxhF3XBimm+3+jsfGUSebKNZ71hVxLIU24aRn/xYxidJUWmK2p60N8bAIET WcMZRT4XjmhXWuGWikV50K9CG4tYFQBReBoao48eSJCTHA/0fQXi0Z8i4I1CjDirw6wE Y9Fv9cQIBkqa/j0CFqwKyzeDqj9ikjSgQ7Ma51hL0W/wEu1c3AGvC4Q1tiXUyqDNZnw+ NZY79T6iIppw0JZDn2Am0IL2atc7Dsz2FoytcydiaDRUhLfzCt6/J9A82PuZJ3tADpbJ c+KQ== 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=0JIyMTWEbgKNU/nXeGzvw+nCv+LbCnygH0rtWYHqaiw=; b=Rj58nSF0s6zqNp2Y6077eWXTaL9UGeN9pde7v0cnyf1wyBOqy+y/eaKtQZSVh7CD/7 dqkIuFFc/+6fjkWRlEqLJmus+2Ei9WboOq/M+qXTihXUsdktNB8FPiX5ek3ZPKxJomIZ nmosbOfkCQwUOUOjAgFXTs3BQStIh11y6Br8ptGF1CK9IvRef89omqAwpgXDpXis3D4i PUJdeL7ZSwLAdSqZULO0RCHY93UwV/GwnGuOv4q61G7agcEM4JDdYn9VmvNwBPzw7p0s 7kNk9tzwoyXR4le3pDz1snwPoNH0AV6qdlDjnm7veUPuxibxGl5zGBxtatfBpHJrnlZD x5kg== X-Gm-Message-State: AKS2vOyiql38n7LtKSJsvsjrW9t40GK2J9/iZw466vDkmU8wCpf280TS G+UVJm3pXml+htLLaS8= X-Received: by 10.237.45.3 with SMTP id h3mr4864594qtd.57.1497417806375; Tue, 13 Jun 2017 22:23:26 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Tue, 13 Jun 2017 22:23:09 -0700 Message-Id: <20170614052311.13785-9-rth@twiddle.net> X-Mailer: git-send-email 2.9.4 In-Reply-To: <20170614052311.13785-1-rth@twiddle.net> References: <20170614052311.13785-1-rth@twiddle.net> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:400d:c0d::242 Subject: [Qemu-devel] [PULL 08/10] tcg/arm: Use ldr (literal) for goto_tb 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: 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-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" The new placement of the TB means that we can use one insn to load the goto_tb destination directly from the TB. Signed-off-by: Richard Henderson --- tcg/arm/tcg-target.inc.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) diff --git a/tcg/arm/tcg-target.inc.c b/tcg/arm/tcg-target.inc.c index 42370e5..d1793ec 100644 --- a/tcg/arm/tcg-target.inc.c +++ b/tcg/arm/tcg-target.inc.c @@ -1669,14 +1669,27 @@ static inline void tcg_out_op(TCGContext *s, TCGOpc= ode opc, } break; case INDEX_op_goto_tb: - tcg_debug_assert(s->tb_jmp_insn_offset =3D=3D 0); { /* Indirect jump method */ - intptr_t ptr =3D (intptr_t)(s->tb_jmp_target_addr + args[0]); - tcg_out_movi32(s, COND_AL, TCG_REG_R0, ptr & ~0xfff); - tcg_out_ld32_12(s, COND_AL, TCG_REG_PC, TCG_REG_R0, ptr & 0xff= f); + intptr_t ptr, dif, dil; + TCGReg base =3D TCG_REG_PC; + + tcg_debug_assert(s->tb_jmp_insn_offset =3D=3D 0); + ptr =3D (intptr_t)(s->tb_jmp_target_addr + args[0]); + dif =3D ptr - ((intptr_t)s->code_ptr + 8); + dil =3D sextract32(dif, 0, 12); + if (dif !=3D dil) { + /* The TB is close, but outside the 12 bits addressable by + the load. We can extend this to 20 bits with a sub of a + shifted immediate from pc. In the vastly unlikely event + the code requires more than 1MB, we'll use 2 insns and + be no worse off. */ + base =3D TCG_REG_R0; + tcg_out_movi32(s, COND_AL, base, ptr - dil); + } + tcg_out_ld32_12(s, COND_AL, TCG_REG_PC, base, dil); + s->tb_jmp_reset_offset[args[0]] =3D tcg_current_code_size(s); } - s->tb_jmp_reset_offset[args[0]] =3D tcg_current_code_size(s); break; case INDEX_op_goto_ptr: tcg_out_bx(s, COND_AL, args[0]); --=20 2.9.4