math/test-nearbyint-except-2.c

   1 /* Test nearbyint functions do not disable exception traps (bug 19228).
   2    Copyright (C) 2015-2020 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 <math.h>
  21 #include <stdio.h>
  22
  23 #ifndef FE_INEXACT
  24 # define FE_INEXACT 0
  25 #endif
  26
  27 #define TEST_FUNC(NAME, FLOAT, SUFFIX)                                  \
  28 static int                                                              \
  29 NAME (void)                                                             \
  30 {                                                                       \
  31   int result = 0;                                                       \
  32   volatile FLOAT a, b __attribute__ ((unused));                         \
  33   a = 1.5;                                                              \
  34   /* nearbyint must work when traps on "inexact" are enabled.  */       \
  35   b = nearbyint ## SUFFIX (a);                                          \
  36   /* And it must have left those traps enabled.  */                     \
  37   if (fegetexcept () == FE_INEXACT)                                     \
  38     puts ("PASS: " #FLOAT);                                             \
  39   else                                                                  \
  40     {                                                                   \
  41       puts ("FAIL: " #FLOAT);                                           \
  42       result = 1;                                                       \
  43     }                                                                   \
  44   return result;                                                        \
  45 }
  46
  47 TEST_FUNC (float_test, float, f)
  48 TEST_FUNC (double_test, double, )
  49 TEST_FUNC (ldouble_test, long double, l)
  50
  51 static int
  52 do_test (void)
  53 {
  54   if (feenableexcept (FE_INEXACT) == -1)
  55     {
  56       puts ("enabling FE_INEXACT traps failed, cannot test");
  57       return 77;
  58     }
  59   int result = float_test ();
  60   feenableexcept (FE_INEXACT);
  61   result |= double_test ();
  62   feenableexcept (FE_INEXACT);
  63   result |= ldouble_test ();
  64   return result;
  65 }
  66
  67 #define TEST_FUNCTION do_test ()
  68 #include "../test-skeleton.c"