sysdeps/m68k/fpu/fraiseexcpt.c

   1 /* Raise given exceptions.
   2    Copyright (C) 1997,99,2000,01,02 Free Software Foundation, Inc.
   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
   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.
  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
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <fenv.h>
  22 #include <float.h>
  23 #include <math.h>
  24
  25 int
  26 __feraiseexcept (int excepts)
  27 {
  28   /* Raise exceptions represented by EXCEPTS.  But we must raise only one
  29      signal at a time.  It is important that if the overflow/underflow
  30      exception and the divide by zero exception are given at the same
  31      time, the overflow/underflow exception follows the divide by zero
  32      exception.  */
  33
  34   /* First: invalid exception.  */
  35   if (excepts & FE_INVALID)
  36     {
  37       /* One example of a invalid operation is 0 * Infinity.  */
  38       double d = HUGE_VAL;
  39       __asm__ __volatile__ ("fmul%.s %#0r0,%0; fnop" : "=f" (d) : "0" (d));
  40     }
  41
  42   /* Next: division by zero.  */
  43   if (excepts & FE_DIVBYZERO)
  44     {
  45       double d = 1.0;
  46       __asm__ __volatile__ ("fdiv%.s %#0r0,%0; fnop" : "=f" (d) : "0" (d));
  47     }
  48
  49   /* Next: overflow.  */
  50   if (excepts & FE_OVERFLOW)
  51     {
  52       long double d = LDBL_MAX;
  53
  54       __asm__ __volatile__ ("fmul%.x %0,%0; fnop" : "=f" (d) : "0" (d));
  55     }
  56
  57   /* Next: underflow.  */
  58   if (excepts & FE_UNDERFLOW)
  59     {
  60       long double d = -LDBL_MAX;
  61
  62       __asm__ __volatile__ ("fetox%.x %0; fnop" : "=f" (d) : "0" (d));
  63     }
  64
  65   /* Last: inexact.  */
  66   if (excepts & FE_INEXACT)
  67     {
  68       long double d = 1.0;
  69       __asm__ __volatile__ ("fdiv%.s %#0r3,%0; fnop" : "=f" (d) : "0" (d));
  70     }
  71
  72   /* Success.  */
  73   return 0;
  74 }
  75
  76 #include <shlib-compat.h>
  77 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  78 strong_alias (__feraiseexcept, __old_feraiseexcept)
  79 compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1);
  80 #endif
  81
  82 libm_hidden_ver (__feraiseexcept, feraiseexcept)
  83 versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2);