From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45734) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d9KAd-0001Kw-K5 for qemu-devel@nongnu.org; Fri, 12 May 2017 19:40:28 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d9KAc-0004BL-Tp for qemu-devel@nongnu.org; Fri, 12 May 2017 19:40:27 -0400 Received: from mail-qk0-x244.google.com ([2607:f8b0:400d:c09::244]:34928) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1d9KAc-0004AE-Qo for qemu-devel@nongnu.org; Fri, 12 May 2017 19:40:26 -0400 Received: by mail-qk0-x244.google.com with SMTP id k74so9846470qke.2 for ; Fri, 12 May 2017 16:40:26 -0700 (PDT) Sender: Richard Henderson From: Richard Henderson Date: Fri, 12 May 2017 16:40:09 -0700 Message-Id: <20170512234009.32557-10-rth@twiddle.net> In-Reply-To: <20170512234009.32557-1-rth@twiddle.net> References: <20170512234009.32557-1-rth@twiddle.net> Subject: [Qemu-devel] [PULL 9/9] target/s390x: implement serialization in BRANCH CONDITION List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: stefanha@redhat.com, Aurelien Jarno From: Aurelien Jarno Signed-off-by: Aurelien Jarno Message-Id: <20170509082800.10756-4-aurelien@aurel32.net> Signed-off-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 3a0a3ee..4c48c59 100644 --- a/target/s390x/translate.c +++ b/target/s390x/translate.c @@ -1518,6 +1518,21 @@ 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); } -- 2.9.3