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c50eee19 | 1 | /* Complex sine function for float types. |
6d7e8eda | 2 | Copyright (C) 1997-2023 Free Software Foundation, Inc. |
ffb84f5e | 3 | This file is part of the GNU C Library. |
ffb84f5e PM |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
ffb84f5e PM |
18 | |
19 | #include <complex.h> | |
20 | #include <fenv.h> | |
21 | #include <math.h> | |
22 | #include <math_private.h> | |
8f5b00d3 | 23 | #include <math-underflow.h> |
ffb84f5e PM |
24 | #include <float.h> |
25 | ||
c50eee19 PM |
26 | CFLOAT |
27 | M_DECL_FUNC (__csin) (CFLOAT x) | |
ffb84f5e | 28 | { |
c50eee19 | 29 | CFLOAT retval; |
ffb84f5e PM |
30 | int negate = signbit (__real__ x); |
31 | int rcls = fpclassify (__real__ x); | |
32 | int icls = fpclassify (__imag__ x); | |
33 | ||
c50eee19 | 34 | __real__ x = M_FABS (__real__ x); |
ffb84f5e PM |
35 | |
36 | if (__glibc_likely (icls >= FP_ZERO)) | |
37 | { | |
38 | /* Imaginary part is finite. */ | |
39 | if (__glibc_likely (rcls >= FP_ZERO)) | |
40 | { | |
41 | /* Real part is finite. */ | |
c50eee19 PM |
42 | const int t = (int) ((M_MAX_EXP - 1) * M_MLIT (M_LN2)); |
43 | FLOAT sinix, cosix; | |
ffb84f5e | 44 | |
c50eee19 | 45 | if (__glibc_likely (__real__ x > M_MIN)) |
ffb84f5e | 46 | { |
c50eee19 | 47 | M_SINCOS (__real__ x, &sinix, &cosix); |
ffb84f5e PM |
48 | } |
49 | else | |
50 | { | |
51 | sinix = __real__ x; | |
c50eee19 | 52 | cosix = 1; |
ffb84f5e PM |
53 | } |
54 | ||
55 | if (negate) | |
56 | sinix = -sinix; | |
57 | ||
c50eee19 | 58 | if (M_FABS (__imag__ x) > t) |
ffb84f5e | 59 | { |
c50eee19 PM |
60 | FLOAT exp_t = M_EXP (t); |
61 | FLOAT ix = M_FABS (__imag__ x); | |
ffb84f5e PM |
62 | if (signbit (__imag__ x)) |
63 | cosix = -cosix; | |
64 | ix -= t; | |
c50eee19 PM |
65 | sinix *= exp_t / 2; |
66 | cosix *= exp_t / 2; | |
ffb84f5e PM |
67 | if (ix > t) |
68 | { | |
69 | ix -= t; | |
70 | sinix *= exp_t; | |
71 | cosix *= exp_t; | |
72 | } | |
73 | if (ix > t) | |
74 | { | |
75 | /* Overflow (original imaginary part of x > 3t). */ | |
c50eee19 PM |
76 | __real__ retval = M_MAX * sinix; |
77 | __imag__ retval = M_MAX * cosix; | |
ffb84f5e PM |
78 | } |
79 | else | |
80 | { | |
c50eee19 | 81 | FLOAT exp_val = M_EXP (ix); |
ffb84f5e PM |
82 | __real__ retval = exp_val * sinix; |
83 | __imag__ retval = exp_val * cosix; | |
84 | } | |
85 | } | |
86 | else | |
87 | { | |
c50eee19 PM |
88 | __real__ retval = M_COSH (__imag__ x) * sinix; |
89 | __imag__ retval = M_SINH (__imag__ x) * cosix; | |
ffb84f5e PM |
90 | } |
91 | ||
92 | math_check_force_underflow_complex (retval); | |
93 | } | |
94 | else | |
95 | { | |
96 | if (icls == FP_ZERO) | |
97 | { | |
98 | /* Imaginary part is 0.0. */ | |
e886c367 | 99 | __real__ retval = __real__ x - __real__ x; |
ffb84f5e | 100 | __imag__ retval = __imag__ x; |
ffb84f5e PM |
101 | } |
102 | else | |
103 | { | |
c50eee19 PM |
104 | __real__ retval = M_NAN; |
105 | __imag__ retval = M_NAN; | |
ffb84f5e PM |
106 | |
107 | feraiseexcept (FE_INVALID); | |
108 | } | |
109 | } | |
110 | } | |
111 | else if (icls == FP_INFINITE) | |
112 | { | |
113 | /* Imaginary part is infinite. */ | |
114 | if (rcls == FP_ZERO) | |
115 | { | |
116 | /* Real part is 0.0. */ | |
c50eee19 | 117 | __real__ retval = M_COPYSIGN (0, negate ? -1 : 1); |
ffb84f5e PM |
118 | __imag__ retval = __imag__ x; |
119 | } | |
120 | else if (rcls > FP_ZERO) | |
121 | { | |
122 | /* Real part is finite. */ | |
c50eee19 | 123 | FLOAT sinix, cosix; |
ffb84f5e | 124 | |
c50eee19 | 125 | if (__glibc_likely (__real__ x > M_MIN)) |
ffb84f5e | 126 | { |
c50eee19 | 127 | M_SINCOS (__real__ x, &sinix, &cosix); |
ffb84f5e PM |
128 | } |
129 | else | |
130 | { | |
131 | sinix = __real__ x; | |
c50eee19 | 132 | cosix = 1; |
ffb84f5e PM |
133 | } |
134 | ||
c50eee19 PM |
135 | __real__ retval = M_COPYSIGN (M_HUGE_VAL, sinix); |
136 | __imag__ retval = M_COPYSIGN (M_HUGE_VAL, cosix); | |
ffb84f5e PM |
137 | |
138 | if (negate) | |
139 | __real__ retval = -__real__ retval; | |
140 | if (signbit (__imag__ x)) | |
141 | __imag__ retval = -__imag__ retval; | |
142 | } | |
143 | else | |
144 | { | |
e886c367 | 145 | __real__ retval = __real__ x - __real__ x; |
c50eee19 | 146 | __imag__ retval = M_HUGE_VAL; |
ffb84f5e PM |
147 | } |
148 | } | |
149 | else | |
150 | { | |
151 | if (rcls == FP_ZERO) | |
c50eee19 | 152 | __real__ retval = M_COPYSIGN (0, negate ? -1 : 1); |
ffb84f5e | 153 | else |
c50eee19 PM |
154 | __real__ retval = M_NAN; |
155 | __imag__ retval = M_NAN; | |
ffb84f5e PM |
156 | } |
157 | ||
158 | return retval; | |
159 | } | |
c50eee19 PM |
160 | |
161 | declare_mgen_alias (__csin, csin) |