From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41248) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bkxFQ-0006BL-Cf for qemu-devel@nongnu.org; Fri, 16 Sep 2016 13:48:26 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bkxFM-0007aT-7Y for qemu-devel@nongnu.org; Fri, 16 Sep 2016 13:48:23 -0400 Received: from mail-pf0-f196.google.com ([209.85.192.196]:33122) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bkxFL-0007Zo-VZ for qemu-devel@nongnu.org; Fri, 16 Sep 2016 13:48:20 -0400 Received: by mail-pf0-f196.google.com with SMTP id q2so1221033pfj.0 for ; Fri, 16 Sep 2016 10:48:19 -0700 (PDT) Sender: Richard Henderson From: Richard Henderson Date: Fri, 16 Sep 2016 10:46:43 -0700 Message-Id: <1474048017-26696-22-git-send-email-rth@twiddle.net> In-Reply-To: <1474048017-26696-1-git-send-email-rth@twiddle.net> References: <1474048017-26696-1-git-send-email-rth@twiddle.net> Subject: [Qemu-devel] [PATCH v4 21/35] target-i386: emulate LOCK'ed NEG using cmpxchg helper List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: "Emilio G. Cota" From: "Emilio G. Cota" [rth: Move redundant qemu_load out of cmpxchg loop.] Signed-off-by: Emilio G. Cota Message-Id: <1467054136-10430-16-git-send-email-cota@braap.org> Signed-off-by: Richard Henderson --- target-i386/translate.c | 38 ++++++++++++++++++++++++++++++++++---- 1 file changed, 34 insertions(+), 4 deletions(-) diff --git a/target-i386/translate.c b/target-i386/translate.c index 49455a3..17a37a3 100644 --- a/target-i386/translate.c +++ b/target-i386/translate.c @@ -4713,11 +4713,41 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s, } break; case 3: /* neg */ - tcg_gen_neg_tl(cpu_T0, cpu_T0); - if (mod != 3) { - gen_op_st_v(s, ot, cpu_T0, cpu_A0); + if (s->prefix & PREFIX_LOCK) { + TCGLabel *label1; + TCGv a0, t0, t1, t2; + + if (mod == 3) { + goto illegal_op; + } + a0 = tcg_temp_local_new(); + t0 = tcg_temp_local_new(); + label1 = gen_new_label(); + + tcg_gen_mov_tl(a0, cpu_A0); + tcg_gen_mov_tl(t0, cpu_T0); + + gen_set_label(label1); + t1 = tcg_temp_new(); + t2 = tcg_temp_new(); + tcg_gen_mov_tl(t2, t0); + tcg_gen_neg_tl(t1, t0); + tcg_gen_atomic_cmpxchg_tl(t0, a0, t0, t1, + s->mem_index, ot | MO_LE); + tcg_temp_free(t1); + tcg_gen_brcond_tl(TCG_COND_NE, t0, t2, label1); + + tcg_temp_free(t2); + tcg_temp_free(a0); + tcg_gen_mov_tl(cpu_T0, t0); + tcg_temp_free(t0); } else { - gen_op_mov_reg_v(ot, rm, cpu_T0); + tcg_gen_neg_tl(cpu_T0, cpu_T0); + if (mod != 3) { + gen_op_st_v(s, ot, cpu_T0, cpu_A0); + } else { + gen_op_mov_reg_v(ot, rm, cpu_T0); + } } gen_op_update_neg_cc(); set_cc_op(s, CC_OP_SUBB + ot); -- 2.5.5