sysdeps/sparc/fpu/fraiseexcpt.c

   1 /* Raise given exceptions.
   2    Copyright (C) 1997, 1999, 2000 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <fenv.h>
  21 #include <float.h>
  22 #include <math.h>
  23 #include <shlib-compat.h>
  24
  25 int
  26 __feraiseexcept (int excepts)
  27 {
  28   static volatile double sink;
  29   static const struct {
  30     double zero, one, max, min, sixteen, pi;
  31   } c = {
  32     0.0, 1.0, DBL_MAX, DBL_MIN, 16.0, M_PI
  33   };
  34
  35   /* Raise exceptions represented by EXPECTS.  But we must raise only
  36      one signal at a time.  It is important the if the overflow/underflow
  37      exception and the inexact exception are given at the same time,
  38      the overflow/underflow exception follows the inexact exception.  */
  39
  40   /* First: invalid exception.  */
  41   if ((FE_INVALID & excepts) != 0)
  42     /* One example of a invalid operation is 0/0.  */
  43     sink = c.zero / c.zero;
  44
  45   /* Next: division by zero.  */
  46   if ((FE_DIVBYZERO & excepts) != 0)
  47     sink = c.one / c.zero;
  48
  49   /* Next: overflow.  */
  50   if ((FE_OVERFLOW & excepts) != 0)
  51     sink = c.max * c.max;
  52
  53   /* Next: underflow.  */
  54   if ((FE_UNDERFLOW & excepts) != 0)
  55     sink = c.min / c.sixteen;
  56
  57   /* Last: inexact.  */
  58   if ((FE_INEXACT & excepts) != 0)
  59     sink = c.one / c.pi;
  60
  61   /* Success.  */
  62   return 0;
  63 }
  64
  65 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  66 strong_alias (__feraiseexcept, __old_feraiseexcept)
  67 compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1);
  68 #endif
  69
  70 versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2);