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bc6dd76e | 1 | /* Complex exponential function. m68k fpu version |
5da9d124 | 2 | Copyright (C) 1997, 1999 Free Software Foundation, Inc. |
bc6dd76e UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
3214b89b 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. | |
bc6dd76e 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 | |
3214b89b | 14 | Lesser General Public License for more details. |
bc6dd76e | 15 | |
3214b89b | 16 | You should have received a copy of the GNU Lesser General Public |
ab84e3ff PE |
17 | License along with the GNU C Library. If not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
bc6dd76e | 19 | |
bc6dd76e UD |
20 | #include <complex.h> |
21 | #include <math.h> | |
5da9d124 | 22 | #include "mathimpl.h" |
bc6dd76e UD |
23 | |
24 | #ifndef SUFF | |
25 | #define SUFF | |
26 | #endif | |
bc6dd76e UD |
27 | #ifndef float_type |
28 | #define float_type double | |
29 | #endif | |
30 | ||
31 | #define CONCATX(a,b) __CONCAT(a,b) | |
32 | #define s(name) CONCATX(name,SUFF) | |
33 | #define m81(func) __m81_u(s(func)) | |
34 | ||
35 | __complex__ float_type | |
36 | s(__cexp) (__complex__ float_type x) | |
37 | { | |
38 | __complex__ float_type retval; | |
e7af313d UD |
39 | unsigned long ix_cond; |
40 | ||
41 | ix_cond = __m81_test (__imag__ x); | |
bc6dd76e | 42 | |
e7af313d | 43 | if ((ix_cond & (__M81_COND_NAN|__M81_COND_INF)) == 0) |
bc6dd76e | 44 | { |
e7af313d UD |
45 | /* Imaginary part is finite. */ |
46 | float_type exp_val = m81(__ieee754_exp) (__real__ x); | |
47 | ||
48 | __real__ retval = __imag__ retval = exp_val; | |
49 | if (m81(__finite) (exp_val)) | |
bc6dd76e | 50 | { |
e7af313d UD |
51 | float_type sin_ix, cos_ix; |
52 | __asm ("fsincos%.x %2,%1:%0" : "=f" (sin_ix), "=f" (cos_ix) | |
53 | : "f" (__imag__ x)); | |
54 | __real__ retval *= cos_ix; | |
55 | if (ix_cond & __M81_COND_ZERO) | |
56 | __imag__ retval = __imag__ x; | |
57 | else | |
58 | __imag__ retval *= sin_ix; | |
59 | } | |
60 | else | |
61 | { | |
62 | /* Compute the sign of the result. */ | |
63 | float_type remainder, pi_2; | |
64 | int quadrant; | |
bc6dd76e | 65 | |
e7af313d UD |
66 | __asm ("fmovecr %#0,%0\n\tfscale%.w %#-1,%0" : "=f" (pi_2)); |
67 | __asm ("fmod%.x %2,%0\n\tfmove%.l %/fpsr,%1" | |
68 | : "=f" (remainder), "=dm" (quadrant) | |
69 | : "f" (pi_2), "0" (__imag__ x)); | |
70 | quadrant = (quadrant >> 16) & 0x83; | |
71 | if (quadrant & 0x80) | |
72 | quadrant ^= 0x83; | |
73 | switch (quadrant) | |
45b0751e | 74 | { |
e7af313d UD |
75 | default: |
76 | break; | |
77 | case 1: | |
78 | __real__ retval = -__real__ retval; | |
79 | break; | |
80 | case 2: | |
81 | __real__ retval = -__real__ retval; | |
82 | case 3: | |
83 | __imag__ retval = -__imag__ retval; | |
84 | break; | |
45b0751e | 85 | } |
e7af313d UD |
86 | if (ix_cond & __M81_COND_ZERO && !m81(__isnan) (exp_val)) |
87 | __imag__ retval = __imag__ x; | |
bc6dd76e | 88 | } |
bc6dd76e | 89 | } |
e7af313d | 90 | else |
bc6dd76e | 91 | { |
e7af313d | 92 | unsigned long rx_cond = __m81_test (__real__ x); |
45b0751e | 93 | |
e7af313d UD |
94 | if (rx_cond & __M81_COND_INF) |
95 | { | |
96 | /* Real part is infinite. */ | |
97 | if (rx_cond & __M81_COND_NEG) | |
45b0751e | 98 | { |
e7af313d UD |
99 | __real__ retval = __imag__ retval = 0.0; |
100 | if (ix_cond & __M81_COND_NEG) | |
101 | __imag__ retval = -__imag__ retval; | |
45b0751e | 102 | } |
bc6dd76e UD |
103 | else |
104 | { | |
e7af313d UD |
105 | __real__ retval = __real__ x; |
106 | __imag__ retval = __imag__ x - __imag__ x; | |
bc6dd76e UD |
107 | } |
108 | } | |
bc6dd76e | 109 | else |
e7af313d | 110 | __real__ retval = __imag__ retval = __imag__ x - __imag__ x; |
bc6dd76e | 111 | } |
bc6dd76e UD |
112 | |
113 | return retval; | |
114 | } | |
115 | #define weak_aliasx(a,b) weak_alias(a,b) | |
116 | weak_aliasx (s(__cexp), s(cexp)) |