From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:32916) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VHptG-00010u-47 for qemu-devel@nongnu.org; Fri, 06 Sep 2013 02:51:39 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VHpt9-0005AW-GH for qemu-devel@nongnu.org; Fri, 06 Sep 2013 02:51:34 -0400 Received: from mail-qe0-x22d.google.com ([2607:f8b0:400d:c02::22d]:43994) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VHpt9-0005AD-C9 for qemu-devel@nongnu.org; Fri, 06 Sep 2013 02:51:27 -0400 Received: by mail-qe0-f45.google.com with SMTP id 6so1516498qea.32 for ; Thu, 05 Sep 2013 23:51:27 -0700 (PDT) Sender: Richard Henderson From: Richard Henderson Date: Thu, 5 Sep 2013 23:50:28 -0700 Message-Id: <1378450242-27080-7-git-send-email-rth@twiddle.net> In-Reply-To: <1378450242-27080-1-git-send-email-rth@twiddle.net> References: <1378450242-27080-1-git-send-email-rth@twiddle.net> Subject: [Qemu-devel] [PATCH 06/19] tcg-ia64: Avoid unnecessary stop bit in tcg_out_alu List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: aurelien@aurel32.net, Richard Henderson When performing an operation with two input registers, we'd leave the stop bit (and thus an extra cycle) that's only needed when one or the other input is a constant. Signed-off-by: Richard Henderson --- tcg/ia64/tcg-target.c | 17 ++++++----------- 1 file changed, 6 insertions(+), 11 deletions(-) diff --git a/tcg/ia64/tcg-target.c b/tcg/ia64/tcg-target.c index ad5a6b9..f0c5e0b 100644 --- a/tcg/ia64/tcg-target.c +++ b/tcg/ia64/tcg-target.c @@ -1042,31 +1042,26 @@ static inline void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg, } } -static inline void tcg_out_alu(TCGContext *s, uint64_t opc_a1, TCGArg ret, - TCGArg arg1, int const_arg1, - TCGArg arg2, int const_arg2) +static void tcg_out_alu(TCGContext *s, uint64_t opc_a1, TCGReg ret, TCGArg arg1, + int const_arg1, TCGArg arg2, int const_arg2) { - uint64_t opc1, opc2; + uint64_t opc1 = 0, opc2 = 0; if (const_arg1 && arg1 != 0) { opc1 = tcg_opc_a5(TCG_REG_P0, OPC_ADDL_A5, TCG_REG_R2, arg1, TCG_REG_R0); arg1 = TCG_REG_R2; - } else { - opc1 = INSN_NOP_M; } if (const_arg2 && arg2 != 0) { opc2 = tcg_opc_a5(TCG_REG_P0, OPC_ADDL_A5, TCG_REG_R3, arg2, TCG_REG_R0); arg2 = TCG_REG_R3; - } else { - opc2 = INSN_NOP_I; } - tcg_out_bundle(s, mII, - opc1, - opc2, + tcg_out_bundle(s, (opc1 || opc2 ? mII : miI), + opc1 ? opc1 : INSN_NOP_M, + opc2 ? opc2 : INSN_NOP_I, tcg_opc_a1(TCG_REG_P0, opc_a1, ret, arg1, arg2)); } -- 1.8.3.1