1 /* Math functions for i387.
2 Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by John C. Bowman <bowman@ipp-garching.mpg.de>, 1995.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If not,
18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 double atan (double __x);
23 double ceil (double __x);
24 double cos (double __x);
25 double fabs (double __x);
26 double floor (double __x);
27 double log (double __x);
28 double __log2 (double __x);
29 double pow (double __x, double __y);
30 double sin (double __x);
31 double sqrt (double __x);
32 double tan (double __x);
35 double atan (double __x)
37 register double __value;
41 : "=t" (__value) : "0" (__x));
46 double ceil (double __x)
48 register double __value;
49 __volatile unsigned short int __cw, __cwtmp;
51 __asm __volatile ("fnstcw %0" : "=m" (__cw));
52 __cwtmp = (__cw & 0xf3ff) | 0x0800; /* rounding up */
53 __asm __volatile ("fldcw %0" : : "m" (__cwtmp));
54 __asm __volatile ("frndint" : "=t" (__value) : "0" (__x));
55 __asm __volatile ("fldcw %0" : : "m" (__cw));
60 double cos (double __x)
62 register double __value;
65 : "=t" (__value): "0" (__x));
70 double fabs (double __x)
72 register double __value;
75 : "=t" (__value) : "0" (__x));
80 double floor (double __x)
82 register double __value;
83 __volatile unsigned short int __cw, __cwtmp;
85 __asm __volatile ("fnstcw %0" : "=m" (__cw));
86 __cwtmp = (__cw & 0xf3ff) | 0x0400; /* rounding down */
87 __asm __volatile ("fldcw %0" : : "m" (__cwtmp));
88 __asm __volatile ("frndint" : "=t" (__value) : "0" (__x));
89 __asm __volatile ("fldcw %0" : : "m" (__cw));
94 double log (double __x)
96 register double __value;
101 : "=t" (__value) : "0" (__x));
106 double __log2 (double __x)
108 register double __value;
113 : "=t" (__value) : "0" (__x));
118 double pow (double __x, double __y)
120 register double __value, __exponent;
121 long __p = (long) __y;
123 if (__x == 0.0 && __y > 0.0)
125 if (__y == (double) __p)
147 ("fmul %%st(1) # y * log2(x)\n\t"
149 "frndint # int(y * log2(x))\n\t"
151 "fsub %%st(1) # fract(y * log2(x))\n\t"
152 "f2xm1 # 2^(fract(y * log2(x))) - 1\n\t"
153 : "=t" (__value), "=u" (__exponent) : "0" (__log2 (__x)), "1" (__y));
157 : "=t" (__value) : "0" (__value), "u" (__exponent));
162 double sin (double __x)
164 register double __value;
167 : "=t" (__value) : "0" (__x));
172 double sqrt (double __x)
174 register double __value;
177 : "=t" (__value) : "0" (__x));
182 double tan (double __x)
184 register double __value;
185 register double __value2 __attribute__ ((unused));
188 : "=t" (__value2), "=u" (__value) : "0" (__x));