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63551311 | 1 | /* Complex sine function for float. |
bc62c2fb | 2 | Copyright (C) 1997, 2011 Free Software Foundation, Inc. |
63551311 UD |
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 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
63551311 UD |
19 | |
20 | #include <complex.h> | |
779ae82e | 21 | #include <fenv.h> |
63551311 UD |
22 | #include <math.h> |
23 | ||
9277c064 | 24 | #include <math_private.h> |
779ae82e | 25 | |
63551311 UD |
26 | |
27 | __complex__ float | |
28 | __csinf (__complex__ float x) | |
29 | { | |
779ae82e UD |
30 | __complex__ float retval; |
31 | int negate = signbit (__real__ x); | |
32 | int rcls = fpclassify (__real__ x); | |
33 | int icls = fpclassify (__imag__ x); | |
34 | ||
35 | __real__ x = fabsf (__real__ x); | |
63551311 | 36 | |
bc62c2fb | 37 | if (__builtin_expect (icls >= FP_ZERO, 1)) |
63551311 | 38 | { |
779ae82e | 39 | /* Imaginary part is finite. */ |
bc62c2fb | 40 | if (__builtin_expect (rcls >= FP_ZERO, 1)) |
63551311 | 41 | { |
779ae82e UD |
42 | /* Real part is finite. */ |
43 | float sinh_val = __ieee754_sinhf (__imag__ x); | |
44 | float cosh_val = __ieee754_coshf (__imag__ x); | |
45 | float sinix, cosix; | |
46 | ||
47 | __sincosf (__real__ x, &sinix, &cosix); | |
48 | ||
49 | __real__ retval = cosh_val * sinix; | |
50 | __imag__ retval = sinh_val * cosix; | |
51 | ||
52 | if (negate) | |
53 | __real__ retval = -__real__ retval; | |
63551311 UD |
54 | } |
55 | else | |
56 | { | |
779ae82e UD |
57 | if (icls == FP_ZERO) |
58 | { | |
59 | /* Imaginary part is 0.0. */ | |
60 | __real__ retval = __nanf (""); | |
61 | __imag__ retval = __imag__ x; | |
62 | ||
779ae82e UD |
63 | if (rcls == FP_INFINITE) |
64 | feraiseexcept (FE_INVALID); | |
779ae82e UD |
65 | } |
66 | else | |
67 | { | |
68 | __real__ retval = __nanf (""); | |
69 | __imag__ retval = __nanf (""); | |
70 | ||
779ae82e | 71 | feraiseexcept (FE_INVALID); |
779ae82e | 72 | } |
63551311 UD |
73 | } |
74 | } | |
779ae82e | 75 | else if (icls == FP_INFINITE) |
63551311 | 76 | { |
779ae82e UD |
77 | /* Imaginary part is infinite. */ |
78 | if (rcls == FP_ZERO) | |
79 | { | |
80 | /* Real part is 0.0. */ | |
81 | __real__ retval = __copysignf (0.0, negate ? -1.0 : 1.0); | |
82 | __imag__ retval = __imag__ x; | |
83 | } | |
84 | else if (rcls > FP_ZERO) | |
85 | { | |
86 | /* Real part is finite. */ | |
87 | float sinix, cosix; | |
88 | ||
89 | __sincosf (__real__ x, &sinix, &cosix); | |
63551311 | 90 | |
779ae82e UD |
91 | __real__ retval = __copysignf (HUGE_VALF, sinix); |
92 | __imag__ retval = __copysignf (HUGE_VALF, cosix); | |
63551311 | 93 | |
779ae82e UD |
94 | if (negate) |
95 | __real__ retval = -__real__ retval; | |
96 | if (signbit (__imag__ x)) | |
97 | __imag__ retval = -__imag__ retval; | |
98 | } | |
99 | else | |
100 | { | |
101 | /* The addition raises the invalid exception. */ | |
102 | __real__ retval = __nanf (""); | |
103 | __imag__ retval = HUGE_VALF; | |
63551311 | 104 | |
779ae82e UD |
105 | if (rcls == FP_INFINITE) |
106 | feraiseexcept (FE_INVALID); | |
779ae82e UD |
107 | } |
108 | } | |
109 | else | |
110 | { | |
111 | if (rcls == FP_ZERO) | |
112 | __real__ retval = __copysignf (0.0, negate ? -1.0 : 1.0); | |
113 | else | |
114 | __real__ retval = __nanf (""); | |
115 | __imag__ retval = __nanf (""); | |
63551311 UD |
116 | } |
117 | ||
779ae82e | 118 | return retval; |
63551311 | 119 | } |
1705f0a3 | 120 | #ifndef __csinf |
63551311 | 121 | weak_alias (__csinf, csinf) |
1705f0a3 | 122 | #endif |