From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:54849) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1THHqP-0005ty-BO for qemu-devel@nongnu.org; Thu, 27 Sep 2012 13:25:50 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1THHqK-0005Qy-ML for qemu-devel@nongnu.org; Thu, 27 Sep 2012 13:25:49 -0400 Received: from mail-pb0-f45.google.com ([209.85.160.45]:39647) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1THHqJ-0004ys-Tc for qemu-devel@nongnu.org; Thu, 27 Sep 2012 13:25:44 -0400 Received: by mail-pb0-f45.google.com with SMTP id rp2so3912471pbb.4 for ; Thu, 27 Sep 2012 10:25:43 -0700 (PDT) Sender: Richard Henderson From: Richard Henderson Date: Thu, 27 Sep 2012 10:19:54 -0700 Message-Id: <1348766397-20731-5-git-send-email-rth@twiddle.net> In-Reply-To: <1348766397-20731-1-git-send-email-rth@twiddle.net> References: <1348766397-20731-1-git-send-email-rth@twiddle.net> Subject: [Qemu-devel] [PATCH 4/7] tcg: Optimize double-word comparisons against zero List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Aurelien Jarno Signed-off-by: Richard Henderson --- tcg/optimize.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/tcg/optimize.c b/tcg/optimize.c index d39926e..c972e4f 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -799,6 +799,57 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr, } args += 6; break; + case INDEX_op_brcond2_i32: + /* Simplify LT/GE comparisons vs zero to a single compare + vs the high word of the input. */ + if ((args[4] == TCG_COND_LT || args[4] == TCG_COND_GE) + && temps[args[2]].state == TCG_TEMP_CONST + && temps[args[3]].state == TCG_TEMP_CONST + && temps[args[2]].val == 0 + && temps[args[2]].val == 0) { + gen_opc_buf[op_index] = INDEX_op_brcond_i32; + args[0] = args[1]; + args[1] = args[3]; + args[2] = args[4]; + args[3] = args[5]; + gen_args += 4; + } else { + gen_args[0] = args[0]; + gen_args[1] = args[1]; + gen_args[2] = args[2]; + gen_args[3] = args[3]; + gen_args[4] = args[4]; + gen_args[5] = args[5]; + gen_args += 6; + } + memset(temps, 0, nb_temps * sizeof(struct tcg_temp_info)); + args += 6; + break; + case INDEX_op_setcond2_i32: + /* Simplify LT/GE comparisons vs zero to a single compare + vs the high word of the input. */ + if ((args[5] == TCG_COND_LT || args[5] == TCG_COND_GE) + && temps[args[3]].state == TCG_TEMP_CONST + && temps[args[4]].state == TCG_TEMP_CONST + && temps[args[3]].val == 0 + && temps[args[4]].val == 0) { + gen_opc_buf[op_index] = INDEX_op_setcond_i32; + args[1] = args[2]; + args[2] = args[4]; + args[3] = args[5]; + gen_args += 4; + } else { + reset_temp(args[0]); + gen_args[0] = args[0]; + gen_args[1] = args[1]; + gen_args[2] = args[2]; + gen_args[3] = args[3]; + gen_args[4] = args[4]; + gen_args[5] = args[5]; + gen_args += 6; + } + args += 6; + break; case INDEX_op_call: nb_call_args = (args[0] >> 16) + (args[0] & 0xffff); if (!(args[nb_call_args + 1] & (TCG_CALL_CONST | TCG_CALL_PURE))) { -- 1.7.11.4