summaryrefslogtreecommitdiff
path: root/math/w_powl.c
blob: 7c8d9f8ba400376195b6457096feb28b3d4da08a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
/* Copyright (C) 2011-2014 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <math.h>
#include <math_private.h>


/* wrapper powl */
long double
__powl (long double x, long double y)
{
  long double z = __ieee754_powl (x, y);
  if (__glibc_unlikely (!__finitel (z)))
    {
      if (_LIB_VERSION != _IEEE_)
	{
	  if (__isnanl (x))
	    {
	      if (y == 0.0L)
		/* pow(NaN,0.0) */
		return __kernel_standard_l (x, y, 242);
	    }
	  else if (__finitel (x) && __finitel (y))
	    {
	      if (__isnanl (z))
		/* pow neg**non-int */
		return __kernel_standard_l (x, y, 224);
	      else if (x == 0.0L && y < 0.0L)
		{
		  if (signbit (x) && signbit (z))
		    /* pow(-0.0,negative) */
		    return __kernel_standard_l (x, y, 223);
		  else
		    /* pow(+0.0,negative) */
		    return __kernel_standard_l (x, y, 243);
		}
	      else
		/* pow overflow */
		return __kernel_standard_l (x, y, 221);
	    }
	}
    }
  else if (__builtin_expect (z == 0.0L, 0) && __finitel (x) && __finitel (y)
	   && _LIB_VERSION != _IEEE_)
    {
      if (x == 0.0L)
	{
	  if (y == 0.0L)
	    /* pow(0.0,0.0) */
	    return __kernel_standard_l (x, y, 220);
	}
      else
	/* pow underflow */
	return __kernel_standard_l (x, y, 222);
    }

  return z;
}
weak_alias (__powl, powl)