1/* Raise given exceptions.
2   Copyright (C) 1997-2018 Free Software Foundation, Inc.
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
17   <http://www.gnu.org/licenses/>.  */
18
19#include <fenv.h>
20#include <float.h>
21#include <math.h>
22#include <shlib-compat.h>
23
24int
25__feraiseexcept (int excepts)
26{
27  static const struct {
28    double zero, one, max, min, pi;
29  } c = {
30    0.0, 1.0, DBL_MAX, DBL_MIN, M_PI
31  };
32  double d;
33
34  /* Raise exceptions represented by EXPECTS.  But we must raise only
35     one signal at a time.  It is important the if the overflow/underflow
36     exception and the inexact exception are given at the same time,
37     the overflow/underflow exception follows the inexact exception.  */
38
39  /* First: invalid exception.  */
40  if ((FE_INVALID & excepts) != 0)
41    {
42      /* One example of an invalid operation is 0/0.  */
43      __asm ("" : "=e" (d) : "0" (c.zero));
44      d /= c.zero;
45      __asm __volatile ("" : : "e" (d));
46    }
47
48  /* Next: division by zero.  */
49  if ((FE_DIVBYZERO & excepts) != 0)
50    {
51      __asm ("" : "=e" (d) : "0" (c.one));
52      d /= c.zero;
53      __asm __volatile ("" : : "e" (d));
54    }
55
56  /* Next: overflow.  */
57  if ((FE_OVERFLOW & excepts) != 0)
58    {
59      __asm ("" : "=e" (d) : "0" (c.max));
60      d *= d;
61      __asm __volatile ("" : : "e" (d));
62    }
63
64  /* Next: underflow.  */
65  if ((FE_UNDERFLOW & excepts) != 0)
66    {
67      __asm ("" : "=e" (d) : "0" (c.min));
68      d *= d;
69      __asm __volatile ("" : : "e" (d));
70    }
71
72  /* Last: inexact.  */
73  if ((FE_INEXACT & excepts) != 0)
74    {
75      __asm ("" : "=e" (d) : "0" (c.one));
76      d /= c.pi;
77      __asm __volatile ("" : : "e" (d));
78    }
79
80  /* Success.  */
81  return 0;
82}
83
84#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
85strong_alias (__feraiseexcept, __old_feraiseexcept)
86compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1);
87#endif
88
89libm_hidden_def (__feraiseexcept)
90libm_hidden_ver (__feraiseexcept, feraiseexcept)
91versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2);
92