1 /* Complex sine function for float.
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.
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 <complex.h>
22 #include <fenv.h>
23 #include <math.h>
24
25 #include "math_private.h"
26
27
28 __complex__ float
__csinf(__complex__ float x)29 __csinf (__complex__ float x)
30 {
31 __complex__ float retval;
32 int negate = signbit (__real__ x);
33 int rcls = fpclassify (__real__ x);
34 int icls = fpclassify (__imag__ x);
35
36 __real__ x = fabsf (__real__ x);
37
38 if (icls >= FP_ZERO)
39 {
40 /* Imaginary part is finite. */
41 if (rcls >= FP_ZERO)
42 {
43 /* Real part is finite. */
44 float sinh_val = __ieee754_sinhf (__imag__ x);
45 float cosh_val = __ieee754_coshf (__imag__ x);
46 float sinix, cosix;
47
48 __sincosf (__real__ x, &sinix, &cosix);
49
50 __real__ retval = cosh_val * sinix;
51 __imag__ retval = sinh_val * cosix;
52
53 if (negate)
54 __real__ retval = -__real__ retval;
55 }
56 else
57 {
58 if (icls == FP_ZERO)
59 {
60 /* Imaginary part is 0.0. */
61 __real__ retval = __nanf ("");
62 __imag__ retval = __imag__ x;
63
64 #ifdef FE_INVALID
65 if (rcls == FP_INFINITE)
66 feraiseexcept (FE_INVALID);
67 #endif
68 }
69 else
70 {
71 __real__ retval = __nanf ("");
72 __imag__ retval = __nanf ("");
73
74 #ifdef FE_INVALID
75 feraiseexcept (FE_INVALID);
76 #endif
77 }
78 }
79 }
80 else if (icls == FP_INFINITE)
81 {
82 /* Imaginary part is infinite. */
83 if (rcls == FP_ZERO)
84 {
85 /* Real part is 0.0. */
86 __real__ retval = __copysignf (0.0, negate ? -1.0 : 1.0);
87 __imag__ retval = __imag__ x;
88 }
89 else if (rcls > FP_ZERO)
90 {
91 /* Real part is finite. */
92 float sinix, cosix;
93
94 __sincosf (__real__ x, &sinix, &cosix);
95
96 __real__ retval = __copysignf (HUGE_VALF, sinix);
97 __imag__ retval = __copysignf (HUGE_VALF, cosix);
98
99 if (negate)
100 __real__ retval = -__real__ retval;
101 if (signbit (__imag__ x))
102 __imag__ retval = -__imag__ retval;
103 }
104 else
105 {
106 /* The addition raises the invalid exception. */
107 __real__ retval = __nanf ("");
108 __imag__ retval = HUGE_VALF;
109
110 #ifdef FE_INVALID
111 if (rcls == FP_INFINITE)
112 feraiseexcept (FE_INVALID);
113 #endif
114 }
115 }
116 else
117 {
118 if (rcls == FP_ZERO)
119 __real__ retval = __copysignf (0.0, negate ? -1.0 : 1.0);
120 else
121 __real__ retval = __nanf ("");
122 __imag__ retval = __nanf ("");
123 }
124
125 return retval;
126 }
127 weak_alias (__csinf, csinf)
128