tests/test-fenv-except-tracking-2.c

   1 /* Test of tracking of floating-point exceptions.
   2    Copyright (C) 2023-2025 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2023.  */
  18
  19 #include <config.h>
  20
  21 /* Specification.  */
  22 #include <fenv.h>
  23
  24 #include <stdio.h>
  25
  26 #include "fpe-trapping.h"
  27 #include "macros.h"
  28
  29 #if HAVE_FPE_TRAPPING
  30
  31 /* Check that triggering a floating-point operation can trigger a trap.  */
  32
  33 int
  34 main (int argc, char *argv[])
  35 {
  36   /* Clear FE_INVALID exceptions from past operations.  */
  37   feclearexcept (FE_INVALID);
  38
  39   /* An FE_INVALID exception shall trigger a SIGFPE signal, which by default
  40      terminates the program.  */
  41   if (sigfpe_on_invalid () < 0)
  42     {
  43       fputs ("Skipping test: trapping floating-point exceptions are not supported on this machine.\n", stderr);
  44       return 77;
  45     }
  46
  47   if (argc > 1)
  48     switch (argv[1][0])
  49       {
  50       case 'f':
  51         {
  52           volatile float a, b;
  53           _GL_UNUSED volatile float c;
  54           a = 0; b = 0; c = a / b;
  55         }
  56         break;
  57
  58       case 'd':
  59         {
  60           volatile double a, b;
  61           _GL_UNUSED volatile double c;
  62           a = 0; b = 0; c = a / b;
  63         }
  64         break;
  65
  66       case 'l':
  67         /* This test does not work on Linux/loongarch64 with glibc 2.37.
  68            Likewise on Linux/alpha with glibc 2.7 on Linux 2.6.26.
  69            Likewise on FreeBSD 12.2/sparc, NetBSD 8.0/sparc, OpenBSD 7.2/sparc64.
  70            Likewise on OpenBSD 7.4/mips64.
  71            Cause unknown.  */
  72         #if !((__GLIBC__ >= 2 && defined __loongarch__) \
  73               || ((__GLIBC__ == 2 && __GLIBC_MINOR__ < 36) && defined __alpha) \
  74               || ((defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__) && defined __sparc) \
  75               || (defined __OpenBSD__ && defined __mips64))
  76         {
  77           volatile long double a, b;
  78           _GL_UNUSED volatile long double c;
  79           a = 0; b = 0; c = a / b;
  80         }
  81         #else
  82         fputs ("Skipping test: known failure on this platform\n", stderr);
  83         return 77;
  84         #endif
  85         break;
  86
  87       default:
  88         break;
  89       }
  90
  91   return test_exit_status;
  92 }
  93
  94 #else
  95
  96 int
  97 main ()
  98 {
  99   fputs ("Skipping test: feenableexcept not available\n", stderr);
 100   return 77;
 101 }
 102
 103 #endif