From nobody Mon Feb 9 07:41:19 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zoho.com; dkim=fail spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1496851192207963.6644838100078; Wed, 7 Jun 2017 08:59:52 -0700 (PDT) Received: from localhost ([::1]:44794 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dIdN8-0003rb-G9 for importer@patchew.org; Wed, 07 Jun 2017 11:59:50 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48530) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dIdJV-0000jS-LI for qemu-devel@nongnu.org; Wed, 07 Jun 2017 11:56:06 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dIdJU-0005fh-MY for qemu-devel@nongnu.org; Wed, 07 Jun 2017 11:56:05 -0400 Received: from mail-qt0-x241.google.com ([2607:f8b0:400d:c0d::241]:35642) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1dIdJU-0005f7-Hl for qemu-devel@nongnu.org; Wed, 07 Jun 2017 11:56:04 -0400 Received: by mail-qt0-x241.google.com with SMTP id x58so1991084qtc.2 for ; Wed, 07 Jun 2017 08:56:04 -0700 (PDT) Received: from bigtime.twiddle.net.com (184-217-116-168.pools.spcsdns.net. [184.217.116.168]) by smtp.gmail.com with ESMTPSA id i28sm1272525qta.52.2017.06.07.08.56.02 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 07 Jun 2017 08:56:03 -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=CZuOQA8z7S/McZqGqhuzohMvsuyDE6ISLie/MXe2Pzg=; b=SpmOuu3wfgNYt11L3ETQ9RvJdEYiWHTnNGIKNXpxyzPfytSU+Rnaz+vA0LHUlESbyJ 6chhKxMGZ9vAN7L7BdsnWsmffkYcTaSTpY5WGGYdNlHNVnGJxUZ0doj3vrCtIGnGtvRj 4IfIHkHIlQXTaeyLLS4csBAnO+nECb40ccmpXReuuWBNxCG4x6aPChgWrt7ia/4ymjN2 ncZn4sH9YazdwEFgcTkBtoCeqmjBb6OqgqHA/KDCqYWWVXfx/5rXhuiOoE/9LTGZZbnG Sb9/hDbo0wOzosHloqXo5Q8LwbIge9dJiwCKQoHEoCO93guxEB/cz+qP/jL1HdeOkKra uEdQ== 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=CZuOQA8z7S/McZqGqhuzohMvsuyDE6ISLie/MXe2Pzg=; b=p7qzv2qpTzbODI//lAsIN9vw+TcselJKynm4gbUMxB7F3VpT3XMMWrmSZp4KLZO5TC cmw3sV3aSpEG8CutbCgGnNjTqnPXYh9+B6F6cUd4N52TKkWLCdJT3nlNYL4dIe4veNor 4LZGnVIlFjt46bobFDHnL+5mQrQESit9SHBfxTUfeuRExDzKqW7YtaXiLFpiXsPRFMXI lbVBN3qCdUE4CPtjPMtU9T3gC51F9yk87DliTpvKhzgCmiAX06oKTvCkZCPDqCmmF+Ku drQiJcn2qnc1Du53VGFbyMfz/dFrlx3oAgjDqprGzMIZ6ESaCD4WfyYCUd7zl5a3Issn 7+Ig== X-Gm-Message-State: AKS2vOwvsQaYgpfqQI77RBaHsUJY+pEOCkcEump3WNBFgIw+3h5DGHEz qGpLlqWfnyR1ZjqnSYo= X-Received: by 10.55.55.207 with SMTP id e198mr39894599qka.44.1496850963760; Wed, 07 Jun 2017 08:56:03 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Wed, 7 Jun 2017 08:55:36 -0700 Message-Id: <20170607155536.1193-8-rth@twiddle.net> X-Mailer: git-send-email 2.9.4 In-Reply-To: <20170607155536.1193-1-rth@twiddle.net> References: <20170607155536.1193-1-rth@twiddle.net> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:400d:c0d::241 Subject: [Qemu-devel] [PATCH v4 7/7] target/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: cota@braap.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 18708b1..b640fb9 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