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3e5f5557 | 1 | /* Return value of complex exponential function for float complex value. |
77425c63 | 2 | Copyright (C) 1997, 2011 Free Software Foundation, Inc. |
3e5f5557 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. | |
3e5f5557 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. |
3e5f5557 | 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/>. */ | |
3e5f5557 UD |
19 | |
20 | #include <complex.h> | |
779ae82e | 21 | #include <fenv.h> |
3e5f5557 | 22 | #include <math.h> |
9277c064 | 23 | #include <math_private.h> |
63551311 | 24 | |
3e5f5557 UD |
25 | |
26 | __complex__ float | |
27 | __cexpf (__complex__ float x) | |
28 | { | |
29 | __complex__ float retval; | |
63551311 UD |
30 | int rcls = fpclassify (__real__ x); |
31 | int icls = fpclassify (__imag__ x); | |
3e5f5557 | 32 | |
77425c63 | 33 | if (__builtin_expect (rcls >= FP_ZERO, 1)) |
3e5f5557 | 34 | { |
63551311 | 35 | /* Real part is finite. */ |
77425c63 | 36 | if (__builtin_expect (icls >= FP_ZERO, 1)) |
3e5f5557 | 37 | { |
63551311 UD |
38 | /* Imaginary part is finite. */ |
39 | float exp_val = __ieee754_expf (__real__ x); | |
7799b7b3 UD |
40 | float sinix, cosix; |
41 | ||
42 | __sincosf (__imag__ x, &sinix, &cosix); | |
e7fd8a39 | 43 | |
993b3242 UD |
44 | if (isfinite (exp_val)) |
45 | { | |
7799b7b3 UD |
46 | __real__ retval = exp_val * cosix; |
47 | __imag__ retval = exp_val * sinix; | |
993b3242 UD |
48 | } |
49 | else | |
50 | { | |
7799b7b3 UD |
51 | __real__ retval = __copysignf (exp_val, cosix); |
52 | __imag__ retval = __copysignf (exp_val, sinix); | |
993b3242 | 53 | } |
3e5f5557 UD |
54 | } |
55 | else | |
e7fd8a39 UD |
56 | { |
57 | /* If the imaginary part is +-inf or NaN and the real part | |
58 | is not +-inf the result is NaN + iNaN. */ | |
59 | __real__ retval = __nanf (""); | |
60 | __imag__ retval = __nanf (""); | |
779ae82e | 61 | |
779ae82e | 62 | feraiseexcept (FE_INVALID); |
e7fd8a39 | 63 | } |
3e5f5557 | 64 | } |
77425c63 | 65 | else if (__builtin_expect (rcls == FP_INFINITE, 1)) |
3e5f5557 | 66 | { |
63551311 | 67 | /* Real part is infinite. */ |
77425c63 | 68 | if (__builtin_expect (icls >= FP_ZERO, 1)) |
3e5f5557 | 69 | { |
63551311 | 70 | /* Imaginary part is finite. */ |
993b3242 UD |
71 | float value = signbit (__real__ x) ? 0.0 : HUGE_VALF; |
72 | ||
63551311 | 73 | if (icls == FP_ZERO) |
993b3242 | 74 | { |
63551311 | 75 | /* Imaginary part is 0.0. */ |
993b3242 UD |
76 | __real__ retval = value; |
77 | __imag__ retval = __imag__ x; | |
78 | } | |
3e5f5557 | 79 | else |
e7fd8a39 | 80 | { |
7799b7b3 UD |
81 | float sinix, cosix; |
82 | ||
83 | __sincosf (__imag__ x, &sinix, &cosix); | |
84 | ||
85 | __real__ retval = __copysignf (value, cosix); | |
86 | __imag__ retval = __copysignf (value, sinix); | |
e7fd8a39 UD |
87 | } |
88 | } | |
89 | else if (signbit (__real__ x) == 0) | |
90 | { | |
91 | __real__ retval = HUGE_VALF; | |
92 | __imag__ retval = __nanf (""); | |
779ae82e | 93 | |
779ae82e UD |
94 | if (icls == FP_INFINITE) |
95 | feraiseexcept (FE_INVALID); | |
3e5f5557 | 96 | } |
3e5f5557 | 97 | else |
993b3242 UD |
98 | { |
99 | __real__ retval = 0.0; | |
100 | __imag__ retval = __copysignf (0.0, __imag__ x); | |
101 | } | |
3e5f5557 UD |
102 | } |
103 | else | |
e7fd8a39 | 104 | { |
63551311 | 105 | /* If the real part is NaN the result is NaN + iNaN. */ |
e7fd8a39 UD |
106 | __real__ retval = __nanf (""); |
107 | __imag__ retval = __nanf (""); | |
779ae82e | 108 | |
779ae82e UD |
109 | if (rcls != FP_NAN || icls != FP_NAN) |
110 | feraiseexcept (FE_INVALID); | |
e7fd8a39 | 111 | } |
3e5f5557 UD |
112 | |
113 | return retval; | |
114 | } | |
1705f0a3 | 115 | #ifndef __cexpf |
3e5f5557 | 116 | weak_alias (__cexpf, cexpf) |
1705f0a3 | 117 | #endif |