libgcc/config/aarch64/sfp-exceptions.c

   1 /*
   2  * Copyright (C) 2012-2018 Free Software Foundation, Inc.
   3  *
   4  * This file is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 3, or (at your option) any
   7  * later version.
   8  *
   9  * This file is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * Under Section 7 of GPL version 3, you are granted additional
  15  * permissions described in the GCC Runtime Library Exception, version
  16  * 3.1, as published by the Free Software Foundation.
  17  *
  18  * You should have received a copy of the GNU General Public License and
  19  * a copy of the GCC Runtime Library Exception along with this program;
  20  * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  21  * <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #include "sfp-machine.h"
  25
  26 void
  27 __sfp_handle_exceptions (int _fex)
  28 {
  29   const float fp_max = __FLT_MAX__;
  30   const float fp_min = __FLT_MIN__;
  31   const float fp_1e32 = 1.0e32f;
  32   const float fp_zero = 0.0;
  33   const float fp_one = 1.0;
  34   unsigned fpsr;
  35
  36   if (_fex & FP_EX_INVALID)
  37     {
  38       __asm__ __volatile__ ("fdiv\ts0, %s0, %s0"
  39                             :
  40                             : "w" (fp_zero)
  41                             : "s0");
  42       __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
  43     }
  44   if (_fex & FP_EX_DIVZERO)
  45     {
  46       __asm__ __volatile__ ("fdiv\ts0, %s0, %s1"
  47                             :
  48                             : "w" (fp_one), "w" (fp_zero)
  49                             : "s0");
  50       __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
  51     }
  52   if (_fex & FP_EX_OVERFLOW)
  53     {
  54       __asm__ __volatile__ ("fadd\ts0, %s0, %s1"
  55                             :
  56                             : "w" (fp_max), "w" (fp_1e32)
  57                             : "s0");
  58       __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
  59     }
  60   if (_fex & FP_EX_UNDERFLOW)
  61     {
  62       __asm__ __volatile__ ("fmul\ts0, %s0, %s0"
  63                             :
  64                             : "w" (fp_min)
  65                             : "s0");
  66       __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
  67     }
  68   if (_fex & FP_EX_INEXACT)
  69     {
  70       __asm__ __volatile__ ("fsub\ts0, %s0, %s1"
  71                             :
  72                             : "w" (fp_max), "w" (fp_one)
  73                             : "s0");
  74       __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
  75     }
  76 }