s_floor.S - vx32 - Local 9vx git repository for patches.
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       s_floor.S (2141B)
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            1 /*
            2  * Copyright (c) 1993,94 Winning Strategies, Inc.
            3  * All rights reserved.
            4  *
            5  * Redistribution and use in source and binary forms, with or without
            6  * modification, are permitted provided that the following conditions
            7  * are met:
            8  * 1. Redistributions of source code must retain the above copyright
            9  *    notice, this list of conditions and the following disclaimer.
           10  * 2. Redistributions in binary form must reproduce the above copyright
           11  *    notice, this list of conditions and the following disclaimer in the
           12  *    documentation and/or other materials provided with the distribution.
           13  * 3. All advertising materials mentioning features or use of this software
           14  *    must display the following acknowledgement:
           15  *      This product includes software developed by Winning Strategies, Inc.
           16  * 4. The name of the author may not be used to endorse or promote products
           17  *    derived from this software without specific prior written permission.
           18  *
           19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
           20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
           21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
           22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
           23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
           24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
           25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
           26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
           27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
           28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
           29  */
           30 
           31 /*
           32  * Written by:
           33  *        J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
           34  */
           35 
           36 #include <asm.h>
           37 
           38 ENTRY(floor)
           39         pushl        %ebp
           40         movl        %esp,%ebp
           41         subl        $8,%esp
           42 
           43         fstcw        -4(%ebp)                /* store fpu control word */
           44         movw        -4(%ebp),%dx
           45         orw        $0x0400,%dx                /* round towards -oo */
           46         andw        $0xf7ff,%dx
           47         movw        %dx,-8(%ebp)
           48         fldcw        -8(%ebp)                /* load modfied control word */
           49 
           50         fldl        8(%ebp);                /* round */
           51         frndint
           52 
           53         fldcw        -4(%ebp)                /* restore original control word */
           54 
           55         leave
           56         ret