From patchwork Tue May 9 08:28:00 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aurelien Jarno X-Patchwork-Id: 759971 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3wMXh40n6bz9s3T for ; Tue, 9 May 2017 18:33:24 +1000 (AEST) Received: from localhost ([::1]:35768 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d80a9-0006o5-Hx for incoming@patchwork.ozlabs.org; Tue, 09 May 2017 04:33:21 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49327) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d80V7-0002hg-OQ for qemu-devel@nongnu.org; Tue, 09 May 2017 04:28:10 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d80V7-000063-0t for qemu-devel@nongnu.org; Tue, 09 May 2017 04:28:09 -0400 Received: from hall.aurel32.net ([2001:bc8:30d7:100::1]:35430) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1d80V6-00005g-Rn for qemu-devel@nongnu.org; Tue, 09 May 2017 04:28:08 -0400 Received: from ohm.aurel32.net ([2001:bc8:30d7:111::1000]) by hall.aurel32.net with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1d80V5-0003hk-Ve; Tue, 09 May 2017 10:28:07 +0200 Received: from aurel32 by ohm.aurel32.net with local (Exim 4.89) (envelope-from ) id 1d80V5-0002oi-JT; Tue, 09 May 2017 10:28:07 +0200 From: Aurelien Jarno To: qemu-devel@nongnu.org Date: Tue, 9 May 2017 10:28:00 +0200 Message-Id: <20170509082800.10756-4-aurelien@aurel32.net> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170509082800.10756-1-aurelien@aurel32.net> References: <20170509082800.10756-1-aurelien@aurel32.net> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2001:bc8:30d7:100::1 Subject: [Qemu-devel] [PATCH 3/3] target/s390x: implement serialization in BRANCH CONDITION 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: Alexander Graf , Aurelien Jarno , Richard Henderson Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Aurelien Jarno Reviewed-by: Richard Henderson --- target/s390x/translate.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/target/s390x/translate.c b/target/s390x/translate.c index c58c27f8e9..2f07ce2be9 100644 --- a/target/s390x/translate.c +++ b/target/s390x/translate.c @@ -1517,6 +1517,21 @@ static ExitStatus op_bc(DisasContext *s, DisasOps *o) int imm = is_imm ? get_field(s->fields, i2) : 0; DisasCompare c; + /* BCR with R2 = 0 causes no branching */ + if (have_field(s->fields, r2) && get_field(s->fields, r2) == 0) { + if (m1 == 14) { + /* Perform serialization */ + /* FIXME: check for fast-BCR-serialization facility */ + tcg_gen_mb(TCG_MO_ALL | TCG_BAR_SC); + } + if (m1 == 15) { + /* Perform serialization */ + /* FIXME: perform checkpoint-synchronisation */ + tcg_gen_mb(TCG_MO_ALL | TCG_BAR_SC); + } + return NO_EXIT; + } + disas_jcc(s, &c, m1); return help_branch(s, &c, is_imm, imm, o->in2); }