arch/i386-all/stdc/math/s_tan.s

   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 "aros/i386/asm.h"
  37
  38         .text
  39         _ALIGNMENT
  40         .globl  AROS_CDEFNAME(tan)
  41         _FUNCTION(AROS_CDEFNAME(tan))
  42
  43         .set    FirstArg, 4 /* Skip Return-Adress */
  44         .set    arg_x, FirstArg
  45
  46 AROS_CDEFNAME(tan):
  47         fldl    arg_x(%esp)
  48         fptan
  49         fnstsw  %ax
  50         sahf
  51         jp      1f
  52         fstp    %st(0)
  53         ret
  54 1:      fldpi
  55         fadd    %st(0)
  56         fxch    %st(1)
  57 2:      fprem
  58         fnstsw  %ax
  59         sahf
  60         jp      2b
  61         fstp    %st(1)
  62         fptan
  63         fstp    %st(0)
  64         ret