sysdeps/sparc/fpu/fraiseexcpt.c

   1 /* Raise given exceptions.
   2    Copyright (C) 1997, 1999, 2000, 2002 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 const struct {
  29     double zero, one, max, min, sixteen, pi;
  30   } c = {
  31     0.0, 1.0, DBL_MAX, DBL_MIN, 16.0, M_PI
  32   };
  33   double d;
  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     {
  43       /* One example of a invalid operation is 0/0.  */
  44       __asm ("" : "=e" (d) : "0" (c.zero));
  45       d /= c.zero;
  46       __asm __volatile ("" : : "e" (d));
  47     }
  48
  49   /* Next: division by zero.  */
  50   if ((FE_DIVBYZERO & excepts) != 0)
  51     {
  52       __asm ("" : "=e" (d) : "0" (c.one));
  53       d /= c.zero;
  54       __asm __volatile ("" : : "e" (d));
  55     }
  56
  57   /* Next: overflow.  */
  58   if ((FE_OVERFLOW & excepts) != 0)
  59     {
  60       __asm ("" : "=e" (d) : "0" (c.max));
  61       d *= d;
  62       __asm __volatile ("" : : "e" (d));
  63     }
  64
  65   /* Next: underflow.  */
  66   if ((FE_UNDERFLOW & excepts) != 0)
  67     {
  68       __asm ("" : "=e" (d) : "0" (c.min));
  69       d /= c.sixteen;
  70       __asm __volatile ("" : : "e" (d));
  71     }
  72
  73   /* Last: inexact.  */
  74   if ((FE_INEXACT & excepts) != 0)
  75     {
  76       __asm ("" : "=e" (d) : "0" (c.one));
  77       d /= c.pi;
  78       __asm __volatile ("" : : "e" (d));
  79     }
  80
  81   /* Success.  */
  82   return 0;
  83 }
  84
  85 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  86 strong_alias (__feraiseexcept, __old_feraiseexcept)
  87 compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1);
  88 #endif
  89
  90 libm_hidden_ver (__feraiseexcept, feraiseexcept)
  91 versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2);