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8f5b00d3 | 1 | /* Check for underflow and force underflow exceptions. |
2b778ceb | 2 | Copyright (C) 2015-2021 Free Software Foundation, Inc. |
8f5b00d3 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/>. */ |
8f5b00d3 JM |
18 | |
19 | #ifndef _MATH_UNDERFLOW_H | |
20 | #define _MATH_UNDERFLOW_H 1 | |
21 | ||
22 | #include <float.h> | |
23 | #include <math.h> | |
24 | ||
25 | #include <math-barriers.h> | |
26 | ||
27 | #define fabs_tg(x) __MATH_TG ((x), (__typeof (x)) __builtin_fabs, (x)) | |
28 | ||
29 | /* These must be function-like macros because some __MATH_TG | |
30 | implementations macro-expand the function-name argument before | |
31 | concatenating a suffix to it. */ | |
32 | #define min_of_type_f() FLT_MIN | |
33 | #define min_of_type_() DBL_MIN | |
34 | #define min_of_type_l() LDBL_MIN | |
35 | #define min_of_type_f128() FLT128_MIN | |
36 | ||
37 | #define min_of_type(x) __MATH_TG ((x), (__typeof (x)) min_of_type_, ()) | |
38 | ||
39 | /* If X (which is not a NaN) is subnormal, force an underflow | |
40 | exception. */ | |
41 | #define math_check_force_underflow(x) \ | |
42 | do \ | |
43 | { \ | |
44 | __typeof (x) force_underflow_tmp = (x); \ | |
45 | if (fabs_tg (force_underflow_tmp) \ | |
46 | < min_of_type (force_underflow_tmp)) \ | |
47 | { \ | |
48 | __typeof (force_underflow_tmp) force_underflow_tmp2 \ | |
49 | = force_underflow_tmp * force_underflow_tmp; \ | |
50 | math_force_eval (force_underflow_tmp2); \ | |
51 | } \ | |
52 | } \ | |
53 | while (0) | |
54 | /* Likewise, but X is also known to be nonnegative. */ | |
55 | #define math_check_force_underflow_nonneg(x) \ | |
56 | do \ | |
57 | { \ | |
58 | __typeof (x) force_underflow_tmp = (x); \ | |
59 | if (force_underflow_tmp \ | |
60 | < min_of_type (force_underflow_tmp)) \ | |
61 | { \ | |
62 | __typeof (force_underflow_tmp) force_underflow_tmp2 \ | |
63 | = force_underflow_tmp * force_underflow_tmp; \ | |
64 | math_force_eval (force_underflow_tmp2); \ | |
65 | } \ | |
66 | } \ | |
67 | while (0) | |
68 | /* Likewise, for both real and imaginary parts of a complex | |
69 | result. */ | |
70 | #define math_check_force_underflow_complex(x) \ | |
71 | do \ | |
72 | { \ | |
73 | __typeof (x) force_underflow_complex_tmp = (x); \ | |
74 | math_check_force_underflow (__real__ force_underflow_complex_tmp); \ | |
75 | math_check_force_underflow (__imag__ force_underflow_complex_tmp); \ | |
76 | } \ | |
77 | while (0) | |
78 | ||
79 | #endif /* math-underflow.h */ |