From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51706) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WT1cB-0002yb-W0 for qemu-devel@nongnu.org; Thu, 27 Mar 2014 00:08:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WT1c6-0003dg-2g for qemu-devel@nongnu.org; Thu, 27 Mar 2014 00:08:27 -0400 Received: from mail-qg0-x22c.google.com ([2607:f8b0:400d:c04::22c]:57946) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WT1c5-0003dS-UO for qemu-devel@nongnu.org; Thu, 27 Mar 2014 00:08:21 -0400 Received: by mail-qg0-f44.google.com with SMTP id a108so2153987qge.31 for ; Wed, 26 Mar 2014 21:08:21 -0700 (PDT) Sender: Richard Henderson From: Richard Henderson Date: Wed, 26 Mar 2014 21:08:06 -0700 Message-Id: <1395893293-8243-2-git-send-email-rth@twiddle.net> In-Reply-To: <1395893293-8243-1-git-send-email-rth@twiddle.net> References: <1395893293-8243-1-git-send-email-rth@twiddle.net> Subject: [Qemu-devel] [PATCH v2 1/8] tcg-ia64: Optimize small arguments to exit_tb List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: aurelien@aurel32.net Saves one bundle for the common case of exit_tb 0. Signed-off-by: Richard Henderson --- tcg/ia64/tcg-target.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/tcg/ia64/tcg-target.c b/tcg/ia64/tcg-target.c index 2d8e00c..7407011 100644 --- a/tcg/ia64/tcg-target.c +++ b/tcg/ia64/tcg-target.c @@ -950,15 +950,21 @@ static inline void tcg_out_callr(TCGContext *s, TCGReg addr) static void tcg_out_exit_tb(TCGContext *s, tcg_target_long arg) { int64_t disp; - uint64_t imm; + uint64_t imm, opc1; - tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R8, arg); + /* At least arg == 0 is a common operation. */ + if (arg == sextract64(arg, 0, 22)) { + opc1 = tcg_opc_movi_a(TCG_REG_P0, TCG_REG_R8, arg); + } else { + tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R8, arg); + opc1 = INSN_NOP_M; + } disp = tb_ret_addr - s->code_ptr; imm = (uint64_t)disp >> 4; tcg_out_bundle(s, mLX, - INSN_NOP_M, + opc1, tcg_opc_l3 (imm), tcg_opc_x3 (TCG_REG_P0, OPC_BRL_SPTK_MANY_X3, imm)); } -- 1.8.5.3