* sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
[glibc.git] / math / s_csinl.c
blobf7a1c43600b69d2c7a06eee565a0fcd85c35a1cb
1 /* Complex sine function for long double.
2 Copyright (C) 1997 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 <fenv.h>
23 #include <math.h>
25 #include "math_private.h"
28 __complex__ long double
29 __csinl (__complex__ long double x)
31 __complex__ long double retval;
32 int negate = signbit (__real__ x);
33 int rcls = fpclassify (__real__ x);
34 int icls = fpclassify (__imag__ x);
36 __real__ x = fabsl (__real__ x);
38 if (icls >= FP_ZERO)
40 /* Imaginary part is finite. */
41 if (rcls >= FP_ZERO)
43 /* Real part is finite. */
44 long double sinh_val = __ieee754_sinhl (__imag__ x);
45 long double cosh_val = __ieee754_coshl (__imag__ x);
46 long double sinix, cosix;
48 __sincosl (__real__ x, &sinix, &cosix);
50 __real__ retval = cosh_val * sinix;
51 __imag__ retval = sinh_val * cosix;
53 if (negate)
54 __real__ retval = -__real__ retval;
56 else
58 if (icls == FP_ZERO)
60 /* Imaginary part is 0.0. */
61 __real__ retval = __nanl ("");
62 __imag__ retval = __imag__ x;
64 #ifdef FE_INVALID
65 if (rcls == FP_INFINITE)
66 feraiseexcept (FE_INVALID);
67 #endif
69 else
71 __real__ retval = __nanl ("");
72 __imag__ retval = __nanl ("");
74 #ifdef FE_INVALID
75 feraiseexcept (FE_INVALID);
76 #endif
80 else if (icls == FP_INFINITE)
82 /* Imaginary part is infinite. */
83 if (rcls == FP_ZERO)
85 /* Real part is 0.0. */
86 __real__ retval = __copysignl (0.0, negate ? -1.0 : 1.0);
87 __imag__ retval = __imag__ x;
89 else if (rcls > FP_ZERO)
91 /* Real part is finite. */
92 long double sinix, cosix;
94 __sincosl (__real__ x, &sinix, &cosix);
96 __real__ retval = __copysignl (HUGE_VALL, sinix);
97 __imag__ retval = __copysignl (HUGE_VALL, cosix);
99 if (negate)
100 __real__ retval = -__real__ retval;
101 if (signbit (__imag__ x))
102 __imag__ retval = -__imag__ retval;
104 else
106 /* The addition raises the invalid exception. */
107 __real__ retval = __nanl ("");
108 __imag__ retval = HUGE_VALL;
110 #ifdef FE_INVALID
111 if (rcls == FP_INFINITE)
112 feraiseexcept (FE_INVALID);
113 #endif
116 else
118 if (rcls == FP_ZERO)
119 __real__ retval = __copysignl (0.0, negate ? -1.0 : 1.0);
120 else
121 __real__ retval = __nanl ("");
122 __imag__ retval = __nanl ("");
125 return retval;
127 weak_alias (__csinl, csinl)