Mercurial > hg > CbC > CbC_gcc
comparison libquadmath/math/catanq.c @ 68:561a7518be6b
update gcc-4.6
author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
---|---|
date | Sun, 21 Aug 2011 07:07:55 +0900 |
parents | |
children | 1830386684a0 |
comparison
equal
deleted
inserted
replaced
67:f6334be47118 | 68:561a7518be6b |
---|---|
1 /* Return arc tangent of complex __float128 value. | |
2 Copyright (C) 1997, 1998 Free Software Foundation, Inc. | |
3 This file is part of the GNU C Library. | |
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
5 | |
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. | |
10 | |
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. | |
15 | |
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. */ | |
20 | |
21 #include "quadmath-imp.h" | |
22 | |
23 | |
24 __complex128 | |
25 catanq (__complex128 x) | |
26 { | |
27 __complex128 res; | |
28 int rcls = fpclassifyq (__real__ x); | |
29 int icls = fpclassifyq (__imag__ x); | |
30 | |
31 if (rcls <= QUADFP_INFINITE || icls <= QUADFP_INFINITE) | |
32 { | |
33 if (rcls == QUADFP_INFINITE) | |
34 { | |
35 __real__ res = copysignq (M_PI_2q, __real__ x); | |
36 __imag__ res = copysignq (0.0, __imag__ x); | |
37 } | |
38 else if (icls == QUADFP_INFINITE) | |
39 { | |
40 if (rcls >= QUADFP_ZERO) | |
41 __real__ res = copysignq (M_PI_2q, __real__ x); | |
42 else | |
43 __real__ res = nanq (""); | |
44 __imag__ res = copysignq (0.0, __imag__ x); | |
45 } | |
46 else if (icls == QUADFP_ZERO || icls == QUADFP_INFINITE) | |
47 { | |
48 __real__ res = nanq (""); | |
49 __imag__ res = copysignq (0.0, __imag__ x); | |
50 } | |
51 else | |
52 { | |
53 __real__ res = nanq (""); | |
54 __imag__ res = nanq (""); | |
55 } | |
56 } | |
57 else if (rcls == QUADFP_ZERO && icls == QUADFP_ZERO) | |
58 { | |
59 res = x; | |
60 } | |
61 else | |
62 { | |
63 __float128 r2, num, den; | |
64 | |
65 r2 = __real__ x * __real__ x; | |
66 | |
67 den = 1 - r2 - __imag__ x * __imag__ x; | |
68 | |
69 __real__ res = 0.5 * atan2q (2.0 * __real__ x, den); | |
70 | |
71 num = __imag__ x + 1.0; | |
72 num = r2 + num * num; | |
73 | |
74 den = __imag__ x - 1.0; | |
75 den = r2 + den * den; | |
76 | |
77 __imag__ res = 0.25 * logq (num / den); | |
78 } | |
79 | |
80 return res; | |
81 } |