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. */
21 #include <msvcrt/math.h>
23 double pow (double __x, double __y);
25 double __log2 (double __x);
27 double __log2 (double __x)
29 register double __value;
35 : "=t" (__value) : "0" (__x));
37 //__value = linkme_log2(__x);
43 double pow (double __x, double __y)
45 register double __value;
47 register double __exponent;
48 long __p = (long) __y;
50 if (__x == 0.0 && __y > 0.0)
52 if (__y == (double) __p)
74 ("fmul %%st(1) # y * log2(x)\n\t"
76 "frndint # int(y * log2(x))\n\t"
78 "fsub %%st(1) # fract(y * log2(x))\n\t"
79 "f2xm1 # 2^(fract(y * log2(x))) - 1\n\t"
80 : "=t" (__value), "=u" (__exponent) : "0" (__log2 (__x)), "1" (__y));
84 : "=t" (__value) : "0" (__value), "u" (__exponent));
86 __value = linkme_pow(__x, __y);
91 long double powl (long double __x,long double __y)
93 return pow(__x,__y/2)*pow(__x,__y/2);