s_cos.S - vx32 - Local 9vx git repository for patches.
 (HTM) git clone git://r-36.net/vx32
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       ---
       s_cos.S (1964B)
       ---
            1 /*
            2  * Copyright (c) 1994 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(cos)
           39         fldl        4(%esp)
           40         fcos
           41         fnstsw        %ax
           42         andw        $0x400,%ax
           43         jnz        1f
           44         ret        
           45 1:        fldpi
           46         fadd        %st(0)
           47         fxch        %st(1)
           48 2:        fprem1
           49         fnstsw        %ax
           50         andw        $0x400,%ax
           51         jnz        2b
           52         fstp        %st(1)
           53         fcos
           54         ret