From patchwork Thu Sep 27 17:19:54 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Henderson X-Patchwork-Id: 187417 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 2CD242C007F for ; Fri, 28 Sep 2012 03:25:58 +1000 (EST) Received: from localhost ([::1]:44432 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1THHqW-0005uF-7c for incoming@patchwork.ozlabs.org; Thu, 27 Sep 2012 13:25:56 -0400 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) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:from:to:cc:subject:date:message-id:x-mailer:in-reply-to :references; bh=13dAjgJbNVQFkRxhveGa6fQ5DyQp3jKtOuiC8QXmOE8=; b=sSDnvqvoIePpd/yLsMQG0Cf657LYuj38Id6rKgL7fLkK4mjq9L3pSmAAmUN1vy/kU0 4oGWaOzT/ZewDs4q0s0c3nUBtzt0BzyNGCC2V0+bGxTEZmw7y9tppiwLD6NBQsa3j/Fq Q+sZIc3sf8AGsbv0qLpYyGALOrORJuFlvydRogmmXI/V8jOMok/wj1p8MyrRz3Sjr0cb 7KT8QoymKraEIgK3R34wVjWcnhvYIiE0+CUK4C+EcSQJ+DxMC2MCGPrIgWuig1z65sCO p/wYqrlg4z6I4pKVbDj0m3Pyvj5g28CY0BRS9uNrGB77YxMqE5mvmwnfhFVkjuQy7j8w LUeQ== Received: by 10.66.77.193 with SMTP id u1mr11105346paw.52.1348766410943; Thu, 27 Sep 2012 10:20:10 -0700 (PDT) Received: from anchor.twiddle.home.com ([173.160.232.49]) by mx.google.com with ESMTPS id jw14sm4118581pbb.36.2012.09.27.10.20.10 (version=TLSv1/SSLv3 cipher=OTHER); Thu, 27 Sep 2012 10:20:10 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Thu, 27 Sep 2012 10:19:54 -0700 Message-Id: <1348766397-20731-5-git-send-email-rth@twiddle.net> X-Mailer: git-send-email 1.7.11.4 In-Reply-To: <1348766397-20731-1-git-send-email-rth@twiddle.net> References: <1348766397-20731-1-git-send-email-rth@twiddle.net> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 209.85.160.45 Cc: Aurelien Jarno Subject: [Qemu-devel] [PATCH 4/7] tcg: Optimize double-word comparisons against zero X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org 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))) {