1 /* Raise given exceptions. OpenRISC version.
2 Copyright (C) 2024-2025 Free Software Foundation, Inc.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library. If not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <fenv.h>
19 #include <fpu_control.h>
20 #include <float.h>
21 #include <math.h>
22
23 int
feraiseexcept(int excepts)24 feraiseexcept (int excepts)
25 {
26 if (excepts == 0)
27 return 0;
28
29 /* Raise exceptions represented by EXPECTS. */
30
31 if (excepts & FE_INEXACT)
32 {
33 float d = 1.0, x = 3.0;
34 __asm__ volatile ("lf.div.s %0, %0, %1" : "+r" (d) : "r" (x));
35 }
36
37 if (excepts & FE_UNDERFLOW)
38 {
39 float d = FLT_MIN;
40 __asm__ volatile ("lf.mul.s %0, %0, %0" : "+r" (d));
41 }
42
43 if (excepts & FE_OVERFLOW)
44 {
45 float d = FLT_MAX;
46 __asm__ volatile ("lf.mul.s %0, %0, %0" : "+r" (d) : "r" (d));
47 }
48
49 if (excepts & FE_DIVBYZERO)
50 {
51 float d = 1.0, x = 0.0;
52 __asm__ volatile ("lf.div.s %0, %0, %1" : "+r" (d) : "r" (x));
53 }
54
55 if (excepts & FE_INVALID)
56 {
57 float d = HUGE_VAL, x = 0.0;
58 __asm__ volatile ("lf.mul.s %0, %1, %0" : "+r" (d) : "r" (x));
59 }
60
61 /* Success. */
62 return 0;
63 }
64