1 /* Compute complex base 10 logarithm.
2 Copyright (C) 1997, 1998, 2011 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the 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 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 #include <math_private.h>
26 __complex__
long double
27 __clog10l (__complex__
long double x
)
29 __complex__
long double result
;
30 int rcls
= fpclassify (__real__ x
);
31 int icls
= fpclassify (__imag__ x
);
33 if (__builtin_expect (rcls
== FP_ZERO
&& icls
== FP_ZERO
, 0))
35 /* Real and imaginary part are 0.0. */
36 __imag__ result
= signbit (__real__ x
) ? M_PIl
: 0.0;
37 __imag__ result
= __copysignl (__imag__ result
, __imag__ x
);
38 /* Yes, the following line raises an exception. */
39 __real__ result
= -1.0 / fabsl (__real__ x
);
41 else if (__builtin_expect (rcls
!= FP_NAN
&& icls
!= FP_NAN
, 1))
43 /* Neither real nor imaginary part is NaN. */
44 __real__ result
= __ieee754_log10l (__ieee754_hypotl (__real__ x
,
46 __imag__ result
= M_LOG10El
* __ieee754_atan2l (__imag__ x
, __real__ x
);
50 __imag__ result
= __nanl ("");
51 if (rcls
== FP_INFINITE
|| icls
== FP_INFINITE
)
52 /* Real or imaginary part is infinite. */
53 __real__ result
= HUGE_VALL
;
55 __real__ result
= __nanl ("");
60 weak_alias (__clog10l
, clog10l
)