From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-patches-return-266148-listarch-gcc-patches=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 2838 invoked by alias); 23 Jun 2010 19:16:23 -0000
Received: (qmail 2819 invoked by uid 22791); 23 Jun 2010 19:16:19 -0000
X-SWARE-Spam-Status: No, hits=-2.0 required=5.0	tests=AWL,BAYES_00,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE
X-Spam-Check-By: sourceware.org
Received: from fg-out-1718.google.com (HELO fg-out-1718.google.com) (72.14.220.159)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Wed, 23 Jun 2010 19:16:12 +0000
Received: by fg-out-1718.google.com with SMTP id e12so1453947fga.8        for <gcc-patches@gcc.gnu.org>; Wed, 23 Jun 2010 12:16:09 -0700 (PDT)
Received: by 10.87.67.13 with SMTP id u13mr13679535fgk.66.1277320569167;        Wed, 23 Jun 2010 12:16:09 -0700 (PDT)
Received: from yakj.usersys.redhat.com (s209p8.home.99maxprogres.cz [85.93.118.17])        by mx.google.com with ESMTPS id 26sm13897006fks.22.2010.06.23.12.16.07        (version=TLSv1/SSLv3 cipher=RC4-MD5);        Wed, 23 Jun 2010 12:16:07 -0700 (PDT)
Message-ID: <4C225D75.2070106@gnu.org>
Date: Wed, 23 Jun 2010 19:53:00 -0000
From: Paolo Bonzini <bonzini@gnu.org>
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.10) Gecko/20100621 Fedora/3.0.5-1.fc13 Lightning/1.0b2pre Thunderbird/3.0.5
MIME-Version: 1.0
To: "H.J. Lu" <hjl.tools@gmail.com>
CC: Uros Bizjak <ubizjak@gmail.com>, gcc-patches@gcc.gnu.org
Subject: Re: PATCH: PR target/44588: Very inefficient 8bit mod/div
References: <20100621193321.GA13780@intel.com>	<1277229955.2613.1.camel@localhost>	<AANLkTinvsAQe57kp-irwq_eD3cmUlMmayXHsfnMZNaMN@mail.gmail.com>	<1277232299.2613.13.camel@localhost>	<AANLkTilT8MaCjhWg6EpLKYK35dx9YbMtqihItk_Bs0GQ@mail.gmail.com>	<AANLkTimsX6kCYJ2UBSPp0kVWoDpYoqqBVmqFm0cRgMY8@mail.gmail.com>	<AANLkTiniV21ve1ABjDon6To57pK45A57OL_saLLSCg0n@mail.gmail.com>	<4C224592.5090100@gnu.org>	<AANLkTik0WHZ7HHLvFric-_1YPKRHbJAdDxaQwCCEO_-g@mail.gmail.com>	<4C224EB7.8090900@gnu.org> <AANLkTil0KgTudmb2SBoRml0uJq5Po6mE6IPR0x6NnyjJ@mail.gmail.com>
In-Reply-To: <AANLkTil0KgTudmb2SBoRml0uJq5Po6mE6IPR0x6NnyjJ@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-patches.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-patches/>
List-Post: <mailto:gcc-patches@gcc.gnu.org>
List-Help: <mailto:gcc-patches-help@gcc.gnu.org>
Sender: gcc-patches-owner@gcc.gnu.org
X-SW-Source: 2010-06/txt/msg02371.txt.bz2

On 06/23/2010 08:24 PM, H.J. Lu wrote:
>   [(set (match_operand:HI 0 "register_operand" "=a")
>          (div:HI
>            (match_operand:HI 1 "register_operand" "0")
>            (match_operand:QI 2 "nonimmediate_operand" "qm")))
>     (clobber (reg:CC FLAGS_REG))]

Maybe this:

[(set (match_operand:QI 0 "register_operand" "=a")
    (subreg:QI
     (div:HI
      (match_operand:HI 1 "register_operand" "0")
      (match_operand:QI 2 "nonimmediate_operand" "qm")) 0))
  (clobber (reg:CC FLAGS_REG))]

Paolo