OpenCores
URL https://opencores.org/ocsvn/openrisc_me/openrisc_me/trunk

Subversion Repositories openrisc_me

[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libm/] [math/] [w_exp2.c] - Blame information for rev 258

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 207 jeremybenn
 
2
/* @(#)w_exp2.c 5.1 93/09/24 */
3
/*
4
 * ====================================================
5
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6
 *
7
 * Developed at SunPro, a Sun Microsystems, Inc. business.
8
 * Permission to use, copy, modify, and distribute this
9
 * software is freely granted, provided that this notice
10
 * is preserved.
11
 * ====================================================
12
 */
13
 
14
/*
15
FUNCTION
16
        <<exp2>>, <<exp2f>>--exponential, base 2
17
INDEX
18
        exp2
19
INDEX
20
        exp2f
21
 
22
ANSI_SYNOPSIS
23
        #include <math.h>
24
        double exp2(double <[x]>);
25
        float exp2f(float <[x]>);
26
 
27
DESCRIPTION
28
        <<exp2>> and <<exp2f>> calculate 2 ^ <[x]>, that is,
29
        @ifnottex
30
        2 raised to the power <[x]>.
31
        @end ifnottex
32
        @tex
33
        $2^x$
34
        @end tex
35
 
36
        You can use the (non-ANSI) function <<matherr>> to specify
37
        error handling for these functions.
38
 
39
RETURNS
40
        On success, <<exp2>> and <<exp2f>> return the calculated value.
41
        If the result underflows, the returned value is <<0>>.  If the
42
        result overflows, the returned value is <<HUGE_VAL>>.  In
43
        either case, <<errno>> is set to <<ERANGE>>.
44
 
45
PORTABILITY
46
        ANSI C, POSIX.
47
 
48
*/
49
 
50
/*
51
 * wrapper exp2(x)
52
 */
53
 
54
#include "fdlibm.h"
55
#include <errno.h>
56
#include <math.h>
57
 
58
#ifndef _DOUBLE_IS_32BITS
59
 
60
#ifdef __STDC__
61
        double exp2(double x)           /* wrapper exp2 */
62
#else
63
        double exp2(x)                  /* wrapper exp2 */
64
        double x;
65
#endif
66
{
67
  return pow(2.0, x);
68
}
69
 
70
#endif /* defined(_DOUBLE_IS_32BITS) */

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.