sysdeps/am33/fpu/fraiseexcpt.c

   1 /* Raise given exceptions.
   2    Copyright (C) 2000, 2002, 2004 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Alexandre Oliva <aoliva@redhat.com>
   5    based on corresponding file in the M68K port.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, write to the Free
  19    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  20    02111-1307 USA.  */
  21
  22 #include <fenv.h>
  23 #include <float.h>
  24 #include <math.h>
  25 #include <shlib-compat.h>
  26
  27 int
  28 __feraiseexcept (int excepts)
  29 {
  30   /* Raise exceptions represented by EXCEPTS.  But we must raise only one
  31      signal at a time.  It is important that if the overflow/underflow
  32      exception and the divide by zero exception are given at the same
  33      time, the overflow/underflow exception follows the divide by zero
  34      exception.  */
  35
  36   /* First: invalid exception.  */
  37   if (excepts & FE_INVALID)
  38     {
  39       /* One example of a invalid operation is 0 * Infinity.  */
  40       float x = HUGE_VALF, y = 0.0f;
  41       __asm__ __volatile__ ("fmul %1,%0" : "+f" (x) : "f" (y));
  42     }
  43
  44   /* Next: division by zero.  */
  45   if (excepts & FE_DIVBYZERO)
  46     {
  47       float x = 1.0f, y = 0.0f;
  48       __asm__ __volatile__ ("fdiv %1,%0" : "+f" (x) : "f" (y));
  49     }
  50
  51   /* Next: overflow.  */
  52   if (excepts & FE_OVERFLOW)
  53     {
  54       float x = FLT_MAX;
  55
  56       __asm__ __volatile__ ("fmul %0,%0" : "+f" (x));
  57     }
  58
  59   /* Next: underflow.  */
  60   if (excepts & FE_UNDERFLOW)
  61     {
  62       float x = -FLT_MIN;
  63
  64       __asm__ __volatile__ ("fmul %0,%0" : "+f" (x));
  65     }
  66
  67   /* Last: inexact.  */
  68   if (excepts & FE_INEXACT)
  69     {
  70       float x = 1.0f, y = 3.0f;
  71       __asm__ __volatile__ ("fdiv %1,%0" : "=f" (x) : "f" (y));
  72     }
  73
  74   /* Success.  */
  75   return 0;
  76 }
  77
  78 libm_hidden_ver (__feraiseexcept, feraiseexcept)
  79 versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2);