ports/sysdeps/am33/fpu/fraiseexcpt.c

   1 /* Raise given exceptions.
   2    Copyright (C) 2000-2014 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, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include <fenv.h>
  22 #include <float.h>
  23 #include <math.h>
  24 #include <shlib-compat.h>
  25
  26 int
  27 __feraiseexcept (int excepts)
  28 {
  29   /* Raise exceptions represented by EXCEPTS.  But we must raise only one
  30      signal at a time.  It is important that if the overflow/underflow
  31      exception and the divide by zero exception are given at the same
  32      time, the overflow/underflow exception follows the divide by zero
  33      exception.  */
  34
  35   /* First: invalid exception.  */
  36   if (excepts & FE_INVALID)
  37     {
  38       /* One example of an invalid operation is 0 * Infinity.  */
  39       float x = HUGE_VALF, y = 0.0f;
  40       __asm__ __volatile__ ("fmul %1,%0" : "+f" (x) : "f" (y));
  41     }
  42
  43   /* Next: division by zero.  */
  44   if (excepts & FE_DIVBYZERO)
  45     {
  46       float x = 1.0f, y = 0.0f;
  47       __asm__ __volatile__ ("fdiv %1,%0" : "+f" (x) : "f" (y));
  48     }
  49
  50   /* Next: overflow.  */
  51   if (excepts & FE_OVERFLOW)
  52     {
  53       float x = FLT_MAX;
  54
  55       __asm__ __volatile__ ("fmul %0,%0" : "+f" (x));
  56     }
  57
  58   /* Next: underflow.  */
  59   if (excepts & FE_UNDERFLOW)
  60     {
  61       float x = -FLT_MIN;
  62
  63       __asm__ __volatile__ ("fmul %0,%0" : "+f" (x));
  64     }
  65
  66   /* Last: inexact.  */
  67   if (excepts & FE_INEXACT)
  68     {
  69       float x = 1.0f, y = 3.0f;
  70       __asm__ __volatile__ ("fdiv %1,%0" : "=f" (x) : "f" (y));
  71     }
  72
  73   /* Success.  */
  74   return 0;
  75 }
  76
  77 libm_hidden_ver (__feraiseexcept, feraiseexcept)
  78 versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2);