1 /* Return value of complex exponential function for float complex value.
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
__cexpf(__complex__ float x)29 __cexpf (__complex__ float x)
30 {
31 __complex__ float retval;
32 int rcls = fpclassify (__real__ x);
33 int icls = fpclassify (__imag__ x);
34
35 if (rcls >= FP_ZERO)
36 {
37 /* Real part is finite. */
38 if (icls >= FP_ZERO)
39 {
40 /* Imaginary part is finite. */
41 float exp_val = __ieee754_expf (__real__ x);
42 float sinix, cosix;
43
44 __sincosf (__imag__ x, &sinix, &cosix);
45
46 if (isfinite (exp_val))
47 {
48 __real__ retval = exp_val * cosix;
49 __imag__ retval = exp_val * sinix;
50 }
51 else
52 {
53 __real__ retval = __copysignf (exp_val, cosix);
54 __imag__ retval = __copysignf (exp_val, sinix);
55 }
56 }
57 else
58 {
59 /* If the imaginary part is +-inf or NaN and the real part
60 is not +-inf the result is NaN + iNaN. */
61 __real__ retval = __nanf ("");
62 __imag__ retval = __nanf ("");
63
64 #ifdef FE_INVALID
65 feraiseexcept (FE_INVALID);
66 #endif
67 }
68 }
69 else if (rcls == FP_INFINITE)
70 {
71 /* Real part is infinite. */
72 if (icls >= FP_ZERO)
73 {
74 /* Imaginary part is finite. */
75 float value = signbit (__real__ x) ? 0.0 : HUGE_VALF;
76
77 if (icls == FP_ZERO)
78 {
79 /* Imaginary part is 0.0. */
80 __real__ retval = value;
81 __imag__ retval = __imag__ x;
82 }
83 else
84 {
85 float sinix, cosix;
86
87 __sincosf (__imag__ x, &sinix, &cosix);
88
89 __real__ retval = __copysignf (value, cosix);
90 __imag__ retval = __copysignf (value, sinix);
91 }
92 }
93 else if (signbit (__real__ x) == 0)
94 {
95 __real__ retval = HUGE_VALF;
96 __imag__ retval = __nanf ("");
97
98 #ifdef FE_INVALID
99 if (icls == FP_INFINITE)
100 feraiseexcept (FE_INVALID);
101 #endif
102 }
103 else
104 {
105 __real__ retval = 0.0;
106 __imag__ retval = __copysignf (0.0, __imag__ x);
107 }
108 }
109 else
110 {
111 /* If the real part is NaN the result is NaN + iNaN. */
112 __real__ retval = __nanf ("");
113 __imag__ retval = __nanf ("");
114
115 #ifdef FE_INVALID
116 if (rcls != FP_NAN || icls != FP_NAN)
117 feraiseexcept (FE_INVALID);
118 #endif
119 }
120
121 return retval;
122 }
123 weak_alias (__cexpf, cexpf)
124