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[glibc.git] / math / s_clog10l.c
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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
19 02111-1307 USA. */
21 #include <complex.h>
22 #include <math.h>
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,
45 __imag__ x));
46 __imag__ result = M_LOG10El * __ieee754_atan2l (__imag__ x, __real__ x);
48 else
50 __imag__ result = __nanl ("");
51 if (rcls == FP_INFINITE || icls == FP_INFINITE)
52 /* Real or imaginary part is infinite. */
53 __real__ result = HUGE_VALL;
54 else
55 __real__ result = __nanl ("");
58 return result;
60 weak_alias (__clog10l, clog10l)