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c72aa4a2 | 1 | /* Raise given exceptions. |
688903eb | 2 | Copyright (C) 1997-2018 Free Software Foundation, Inc. |
c72aa4a2 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. | |
c72aa4a2 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. |
c72aa4a2 | 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/>. */ | |
c72aa4a2 UD |
19 | |
20 | #include <fenv.h> | |
e8fcfc26 | 21 | #include <float.h> |
c72aa4a2 UD |
22 | #include <math.h> |
23 | ||
146bade7 UD |
24 | int |
25 | __feraiseexcept (int excepts) | |
c72aa4a2 UD |
26 | { |
27 | /* Raise exceptions represented by EXCEPTS. But we must raise only one | |
28 | signal at a time. It is important that if the overflow/underflow | |
29 | exception and the divide by zero exception are given at the same | |
30 | time, the overflow/underflow exception follows the divide by zero | |
31 | exception. */ | |
32 | ||
33 | /* First: invalid exception. */ | |
34 | if (excepts & FE_INVALID) | |
35 | { | |
c0c3f78a | 36 | /* One example of an invalid operation is 0 * Infinity. */ |
d9814880 UD |
37 | double d = HUGE_VAL; |
38 | __asm__ __volatile__ ("fmul%.s %#0r0,%0; fnop" : "=f" (d) : "0" (d)); | |
c72aa4a2 UD |
39 | } |
40 | ||
41 | /* Next: division by zero. */ | |
42 | if (excepts & FE_DIVBYZERO) | |
43 | { | |
44 | double d = 1.0; | |
45 | __asm__ __volatile__ ("fdiv%.s %#0r0,%0; fnop" : "=f" (d) : "0" (d)); | |
46 | } | |
47 | ||
48 | /* Next: overflow. */ | |
49 | if (excepts & FE_OVERFLOW) | |
50 | { | |
d9814880 | 51 | long double d = LDBL_MAX; |
c49416b5 | 52 | |
75dc7e89 | 53 | __asm__ __volatile__ ("fmul%.x %0,%0; fnop" : "=f" (d) : "0" (d)); |
c72aa4a2 UD |
54 | } |
55 | ||
56 | /* Next: underflow. */ | |
57 | if (excepts & FE_UNDERFLOW) | |
58 | { | |
c49416b5 | 59 | long double d = -LDBL_MAX; |
c49416b5 | 60 | |
75dc7e89 | 61 | __asm__ __volatile__ ("fetox%.x %0; fnop" : "=f" (d) : "0" (d)); |
c72aa4a2 UD |
62 | } |
63 | ||
64 | /* Last: inexact. */ | |
65 | if (excepts & FE_INEXACT) | |
66 | { | |
d9814880 UD |
67 | long double d = 1.0; |
68 | __asm__ __volatile__ ("fdiv%.s %#0r3,%0; fnop" : "=f" (d) : "0" (d)); | |
c72aa4a2 | 69 | } |
146bade7 UD |
70 | |
71 | /* Success. */ | |
72 | return 0; | |
c72aa4a2 | 73 | } |
60446d7a RM |
74 | |
75 | #include <shlib-compat.h> | |
76 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) | |
146bade7 | 77 | strong_alias (__feraiseexcept, __old_feraiseexcept) |
60446d7a RM |
78 | compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1); |
79 | #endif | |
80 | ||
403cc231 | 81 | libm_hidden_def (__feraiseexcept) |
280ad607 | 82 | libm_hidden_ver (__feraiseexcept, feraiseexcept) |
60446d7a | 83 | versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2); |