sysdeps/sh/sh4/fpu/fraiseexcpt.c

   1 /* Raise given exceptions.
   2    Copyright (C) 1997-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Nobuhiro Iwamatsu <iwamatsu@nigauri.org>, 2012.
   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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <fenv.h>
  21 #include <float.h>
  22 #include <fpu_control.h>
  23 #include <math.h>
  24
  25 int
  26 feraiseexcept (int excepts)
  27 {
  28   if (excepts == 0)
  29     return 0;
  30
  31   /* Raise exceptions represented by EXPECTS.  */
  32
  33   if (excepts & FE_INEXACT)
  34   {
  35     double d = 1.0, x = 3.0;
  36     __asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x));
  37   }
  38
  39   if (excepts & FE_UNDERFLOW)
  40   {
  41     long double d = LDBL_MIN, x = 10;
  42     __asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x));
  43   }
  44
  45   if (excepts & FE_OVERFLOW)
  46   {
  47     long double d = LDBL_MAX;
  48     __asm__ __volatile__ ("fmul %0, %0" : "+d" (d) : "d" (d));
  49   }
  50
  51   if (excepts & FE_DIVBYZERO)
  52   {
  53     double d = 1.0, x = 0.0;
  54     __asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x));
  55   }
  56
  57   if (excepts & FE_INVALID)
  58   {
  59     double d = HUGE_VAL, x = 0.0;
  60     __asm__ __volatile__ ("fmul %1, %0" : "+d" (d) : "d" (x));
  61   }
  62
  63   {
  64     /* Restore flag fields.  */
  65     fpu_control_t cw;
  66     _FPU_GETCW (cw);
  67     cw |= (excepts & FE_ALL_EXCEPT);
  68     _FPU_SETCW (cw);
  69   }
  70
  71   return 0;
  72 }
  73 libm_hidden_def (feraiseexcept)