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f56f9124 | 1 | /* Implement __kernel_standard_l. |
dff8da6b | 2 | Copyright (C) 2012-2024 Free Software Foundation, Inc. |
f56f9124 JM |
3 | This file is part of the GNU C Library. |
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/>. |
f56f9124 JM |
18 | |
19 | Parts based on k_standard.c from fdlibm: */ | |
20 | ||
21 | /* @(#)k_standard.c 5.1 93/09/24 */ | |
22 | /* | |
23 | * ==================================================== | |
24 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. | |
25 | * | |
26 | * Developed at SunPro, a Sun Microsystems, Inc. business. | |
27 | * Permission to use, copy, modify, and distribute this | |
28 | * software is freely granted, provided that this notice | |
29 | * is preserved. | |
30 | * ==================================================== | |
31 | */ | |
32 | ||
33 | #include <math.h> | |
b4d5b8b0 | 34 | #include <math-barriers.h> |
813378e9 | 35 | #include <math-svid-compat.h> |
8b1bab5f | 36 | #include <fenv.h> |
f56f9124 JM |
37 | #include <float.h> |
38 | #include <errno.h> | |
39 | ||
40 | ||
4f3647e4 JM |
41 | #if LIBM_SVID_COMPAT |
42 | ||
f56f9124 JM |
43 | static double zero = 0.0; |
44 | ||
45 | /* Handle errors for a libm function as specified by TYPE (see | |
46 | comments in k_standard.c for details), with arguments X and Y, | |
47 | returning the appropriate return value for that function. */ | |
48 | ||
49 | long double | |
50 | __kernel_standard_l (long double x, long double y, int type) | |
51 | { | |
52 | double dx, dy; | |
53 | struct exception exc; | |
8b1bab5f JM |
54 | fenv_t env; |
55 | ||
56 | feholdexcept (&env); | |
57 | dx = x; | |
58 | dy = y; | |
59 | math_force_eval (dx); | |
60 | math_force_eval (dy); | |
61 | fesetenv (&env); | |
f56f9124 JM |
62 | |
63 | switch (type) | |
64 | { | |
65 | case 221: | |
66 | /* powl (x, y) overflow. */ | |
67 | exc.arg1 = dx; | |
68 | exc.arg2 = dy; | |
69 | exc.type = OVERFLOW; | |
70 | exc.name = (char *) "powl"; | |
71 | if (_LIB_VERSION == _SVID_) | |
72 | { | |
73 | exc.retval = HUGE; | |
74 | y *= 0.5; | |
f29b6f17 | 75 | if (x < zero && rintl (y) != y) |
f56f9124 JM |
76 | exc.retval = -HUGE; |
77 | } | |
78 | else | |
79 | { | |
80 | exc.retval = HUGE_VAL; | |
81 | y *= 0.5; | |
f29b6f17 | 82 | if (x < zero && rintl (y) != y) |
f56f9124 JM |
83 | exc.retval = -HUGE_VAL; |
84 | } | |
85 | if (_LIB_VERSION == _POSIX_) | |
86 | __set_errno (ERANGE); | |
87 | else if (!matherr (&exc)) | |
88 | __set_errno (ERANGE); | |
89 | return exc.retval; | |
90 | ||
91 | case 222: | |
92 | /* powl (x, y) underflow. */ | |
93 | exc.arg1 = dx; | |
94 | exc.arg2 = dy; | |
95 | exc.type = UNDERFLOW; | |
96 | exc.name = (char *) "powl"; | |
97 | exc.retval = zero; | |
98 | y *= 0.5; | |
f29b6f17 | 99 | if (x < zero && rintl (y) != y) |
f56f9124 JM |
100 | exc.retval = -zero; |
101 | if (_LIB_VERSION == _POSIX_) | |
102 | __set_errno (ERANGE); | |
103 | else if (!matherr (&exc)) | |
104 | __set_errno (ERANGE); | |
105 | return exc.retval; | |
106 | ||
107 | default: | |
108 | return __kernel_standard (dx, dy, type); | |
109 | } | |
110 | } | |
4f3647e4 | 111 | #endif |