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63551311 UD |
1 | /* Complex sine function for 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. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
63551311 UD |
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 | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
63551311 | 15 | |
41bdb6e2 AJ |
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. */ | |
63551311 UD |
20 | |
21 | #include <complex.h> | |
779ae82e | 22 | #include <fenv.h> |
63551311 UD |
23 | #include <math.h> |
24 | ||
779ae82e UD |
25 | #include "math_private.h" |
26 | ||
63551311 UD |
27 | |
28 | __complex__ double | |
29 | __csin (__complex__ double x) | |
30 | { | |
779ae82e UD |
31 | __complex__ double retval; |
32 | int negate = signbit (__real__ x); | |
33 | int rcls = fpclassify (__real__ x); | |
34 | int icls = fpclassify (__imag__ x); | |
35 | ||
36 | __real__ x = fabs (__real__ x); | |
63551311 | 37 | |
779ae82e | 38 | if (icls >= FP_ZERO) |
63551311 | 39 | { |
779ae82e UD |
40 | /* Imaginary part is finite. */ |
41 | if (rcls >= FP_ZERO) | |
63551311 | 42 | { |
779ae82e UD |
43 | /* Real part is finite. */ |
44 | double sinh_val = __ieee754_sinh (__imag__ x); | |
45 | double cosh_val = __ieee754_cosh (__imag__ x); | |
46 | double sinix, cosix; | |
47 | ||
48 | __sincos (__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; | |
63551311 UD |
55 | } |
56 | else | |
57 | { | |
779ae82e UD |
58 | if (icls == FP_ZERO) |
59 | { | |
60 | /* Imaginary part is 0.0. */ | |
61 | __real__ retval = __nan (""); | |
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 = __nan (""); | |
72 | __imag__ retval = __nan (""); | |
73 | ||
74 | #ifdef FE_INVALID | |
75 | feraiseexcept (FE_INVALID); | |
76 | #endif | |
77 | } | |
63551311 UD |
78 | } |
79 | } | |
779ae82e | 80 | else if (icls == FP_INFINITE) |
63551311 | 81 | { |
779ae82e UD |
82 | /* Imaginary part is infinite. */ |
83 | if (rcls == FP_ZERO) | |
84 | { | |
85 | /* Real part is 0.0. */ | |
86 | __real__ retval = __copysign (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 | double sinix, cosix; | |
93 | ||
94 | __sincos (__real__ x, &sinix, &cosix); | |
63551311 | 95 | |
779ae82e UD |
96 | __real__ retval = __copysign (HUGE_VAL, sinix); |
97 | __imag__ retval = __copysign (HUGE_VAL, cosix); | |
63551311 | 98 | |
779ae82e UD |
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 = __nan (""); | |
108 | __imag__ retval = HUGE_VAL; | |
63551311 | 109 | |
779ae82e UD |
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 = __copysign (0.0, negate ? -1.0 : 1.0); | |
120 | else | |
121 | __real__ retval = __nan (""); | |
122 | __imag__ retval = __nan (""); | |
63551311 UD |
123 | } |
124 | ||
779ae82e | 125 | return retval; |
63551311 UD |
126 | } |
127 | weak_alias (__csin, csin) | |
128 | #ifdef NO_LONG_DOUBLE | |
129 | strong_alias (__csin, __csinl) | |
130 | weak_alias (__csin, csinl) | |
131 | #endif |