1  /* Raise given exceptions.
       2     Copyright (C) 2018-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library.  If not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <fenv.h>
      20  #include <fenv_libc.h>
      21  #include <fpu_control.h>
      22  #include <float.h>
      23  #include <math.h>
      24  
      25  int
      26  __feraiseexcept (int excepts)
      27  {
      28      /* Raise exceptions represented by EXCEPTS.  But we must raise only one
      29       signal at a time.  It is important that if the overflow/underflow
      30       exception and the divide by zero exception are given at the same
      31       time, the overflow/underflow exception follows the divide by zero
      32       exception.  */
      33  
      34  # ifndef __csky_fpuv1__
      35      /* First: invalid exception.  */
      36      if (FE_INVALID & excepts)
      37      {
      38        /* One example of a invalid operation is 0 * Infinity.  */
      39        float x = HUGE_VALF, y = 0.0f;
      40        __asm__ __volatile__ ("fmuls %0, %0, %1" : "+v" (x) : "v" (y));
      41      }
      42  
      43      /* Next: division by zero.  */
      44      if (FE_DIVBYZERO & excepts)
      45      {
      46        float x = 1.0f, y = 0.0f;
      47        __asm__ __volatile__ ("fdivs %0, %0, %1" : "+v" (x) : "v" (y));
      48      }
      49  
      50      /* Next: overflow.  */
      51      if (FE_OVERFLOW & excepts)
      52      {
      53        float x = FLT_MAX;
      54        __asm__ __volatile__ ("fmuls %0, %0, %0" : "+v" (x));
      55      }
      56      /* Next: underflow.  */
      57      if (FE_UNDERFLOW & excepts)
      58      {
      59        float x = -FLT_MIN;
      60  
      61        __asm__ __volatile__ ("fmuls %0, %0, %0" : "+v" (x));
      62      }
      63  
      64      /* Last: inexact.  */
      65      if (FE_INEXACT & excepts)
      66      {
      67        float x = 1.0f, y = 3.0f;
      68        __asm__ __volatile__ ("fdivs %0, %0, %1" : "+v" (x) : "v" (y));
      69      }
      70  
      71      if (__FE_DENORMAL & excepts)
      72      {
      73        double x = 4.9406564584124654e-324;
      74        __asm__ __volatile__ ("fstod %0, %0" : "+v" (x));
      75      }
      76  # else
      77       int tmp = 0;
      78      /* First: invalid exception.  */
      79      if (FE_INVALID & excepts)
      80      {
      81        /* One example of a invalid operation is 0 * Infinity.  */
      82        float x = HUGE_VALF, y = 0.0f;
      83        __asm__ __volatile__ ("fmuls %0, %0, %2, %1"
      84                      : "+f" (x), "+r"(tmp) : "f" (y));
      85      }
      86  
      87      /* Next: division by zero.  */
      88      if (FE_DIVBYZERO & excepts)
      89      {
      90        float x = 1.0f, y = 0.0f;
      91        __asm__ __volatile__ ("fdivs %0, %0, %2, %1"
      92                      : "+f" (x), "+r"(tmp) : "f" (y));
      93      }
      94  
      95      /* Next: overflow.  */
      96      if (FE_OVERFLOW & excepts)
      97      {
      98        float x = FLT_MAX, y = FLT_MAX;
      99        __asm__ __volatile__ ("fmuls %0, %0, %2, %1"
     100                      : "+f" (x), "+r"(tmp) : "f" (y));
     101      }
     102  
     103      /* Next: underflow.  */
     104      if (FE_UNDERFLOW & excepts)
     105      {
     106        float x = -FLT_MIN, y = -FLT_MIN;
     107  
     108        __asm__ __volatile__ ("fmuls %0, %0, %2, %1"
     109                      : "+f" (x), "+r"(tmp) : "f" (y));
     110      }
     111  
     112      /* Last: inexact.  */
     113      if (FE_INEXACT & excepts)
     114      {
     115        float x = 1.0f, y = 3.0f;
     116        __asm__ __volatile__ ("fdivs %0, %0, %2, %1"
     117                      : "+f" (x), "+r"(tmp) : "f" (y));
     118      }
     119  # endif /* __csky_fpuv2__ */
     120  
     121      /* Success.  */
     122      return 0;
     123  }
     124  libm_hidden_def (__feraiseexcept)
     125  weak_alias (__feraiseexcept, feraiseexcept)
     126  libm_hidden_weak (feraiseexcept)