sysdeps/sparc/sparc32/q_util.c

   1 /* Software floating-point emulation.
   2    Helper routine for _Q_* routines.
   3    Simulate exceptions using double arithmetics.
   4    Copyright (C) 1999-2018 Free Software Foundation, Inc.
   5    This file is part of the GNU C Library.
   6    Contributed by Jakub Jelinek (jj@ultra.linux.cz).
   7
   8    The GNU C Library is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU Lesser General Public
  10    License as published by the Free Software Foundation; either
  11    version 2.1 of the License, or (at your option) any later version.
  12
  13    The GNU C Library is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    Lesser General Public License for more details.
  17
  18    You should have received a copy of the GNU Lesser General Public
  19    License along with the GNU C Library; if not, see
  20    <http://www.gnu.org/licenses/>.  */
  21
  22 #include <float.h>
  23 #include <math.h>
  24 #include <assert.h>
  25 #include "soft-fp.h"
  26
  27 unsigned long long ___Q_zero = 0x0000000000000000ULL;
  28
  29 void ___Q_simulate_exceptions(int exceptions)
  30 {
  31   if (exceptions & FP_EX_INVALID)
  32     {
  33       float f = 0.0;
  34       __asm__ __volatile__ ("fdivs %0, %0, %0" : "+f" (f));
  35     }
  36   if (exceptions & FP_EX_DIVZERO)
  37     {
  38       float f = 1.0, g = 0.0;
  39       __asm__ __volatile__ ("fdivs %0, %1, %0"
  40                             : "+f" (f)
  41                             : "f" (g));
  42     }
  43   if (exceptions & FP_EX_OVERFLOW)
  44     {
  45       float f = FLT_MAX;
  46       __asm__ __volatile__("fmuls %0, %0, %0" : "+f" (f));
  47       exceptions &= ~FP_EX_INEXACT;
  48     }
  49   if (exceptions & FP_EX_UNDERFLOW)
  50     {
  51       float f = FLT_MIN;
  52       __asm__ __volatile__("fmuls %0, %0, %0" : "+f" (f));
  53       exceptions &= ~FP_EX_INEXACT;
  54     }
  55   if (exceptions & FP_EX_INEXACT)
  56     {
  57       double d = 1.0, e = M_PI;
  58       __asm__ __volatile__ ("fdivd %0, %1, %0"
  59                             : "+f" (d)
  60                             : "f" (e));
  61     }
  62 }