tests/test-fenv-except-tracking-1.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 "macros.h"
  25
  26 /* On *BSD/powerpc systems, raising FE_INVALID also sets FE_VXSOFT.  */
  27 #ifndef FE_VXSOFT
  28 # define FE_VXSOFT 0
  29 #endif
  30 #ifndef FE_VXZDZ
  31 # define FE_VXZDZ 0
  32 #endif
  33
  34 static volatile double a, b, c;
  35
  36 int
  37 main ()
  38 {
  39   /* Test setting all exception flags.  */
  40   if (feraiseexcept (FE_ALL_EXCEPT) != 0)
  41     {
  42       fputs ("Skipping test: floating-point exceptions are not supported on this machine.\n", stderr);
  43       return 77;
  44     }
  45   ASSERT (/* with the libc's feraiseexcept(): */
  46           fetestexcept (FE_ALL_EXCEPT) == FE_ALL_EXCEPT
  47           || /* with gnulib's feraiseexcept(): */
  48              (fetestexcept (FE_ALL_EXCEPT) & ~FE_VXSOFT)
  49              == (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW));
  50   ASSERT (fetestexcept (FE_INVALID) == FE_INVALID);
  51   ASSERT (fetestexcept (FE_DIVBYZERO) == FE_DIVBYZERO);
  52   ASSERT (fetestexcept (FE_OVERFLOW) == FE_OVERFLOW);
  53   ASSERT (fetestexcept (FE_UNDERFLOW) == FE_UNDERFLOW);
  54   ASSERT (fetestexcept (FE_INEXACT) == FE_INEXACT);
  55
  56   /* Test clearing all exception flags.  */
  57   ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
  58   ASSERT (fetestexcept (FE_ALL_EXCEPT) == 0);
  59   ASSERT (fetestexcept (FE_INVALID) == 0);
  60   ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
  61   ASSERT (fetestexcept (FE_OVERFLOW) == 0);
  62   ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
  63   ASSERT (fetestexcept (FE_INEXACT) == 0);
  64
  65
  66   /* Test setting just one exception flag: FE_INVALID.  */
  67   ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
  68   ASSERT (feraiseexcept (FE_INVALID) == 0);
  69   ASSERT ((fetestexcept (FE_ALL_EXCEPT) & ~FE_VXSOFT) == FE_INVALID);
  70   ASSERT (fetestexcept (FE_INVALID) == FE_INVALID);
  71   ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
  72   ASSERT (fetestexcept (FE_OVERFLOW) == 0);
  73   ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
  74   ASSERT (fetestexcept (FE_INEXACT) == 0);
  75
  76   /* Test setting just one exception flag: FE_DIVBYZERO.  */
  77   ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
  78   ASSERT (feraiseexcept (FE_DIVBYZERO) == 0);
  79   ASSERT (fetestexcept (FE_ALL_EXCEPT) == FE_DIVBYZERO);
  80   ASSERT (fetestexcept (FE_INVALID) == 0);
  81   ASSERT (fetestexcept (FE_DIVBYZERO) == FE_DIVBYZERO);
  82   ASSERT (fetestexcept (FE_OVERFLOW) == 0);
  83   ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
  84   ASSERT (fetestexcept (FE_INEXACT) == 0);
  85
  86   /* Test setting just one exception flag: FE_OVERFLOW.
  87      On many architectures, this has the side-effect of also setting FE_INEXACT:
  88      arm64, arm, alpha, hppa, ia64, loongarch64, s390, sh, sparc.  */
  89   ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
  90   ASSERT (feraiseexcept (FE_OVERFLOW) == 0);
  91   ASSERT ((fetestexcept (FE_ALL_EXCEPT) & ~FE_INEXACT) == FE_OVERFLOW);
  92   ASSERT (fetestexcept (FE_INVALID) == 0);
  93   ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
  94   ASSERT (fetestexcept (FE_OVERFLOW) == FE_OVERFLOW);
  95   ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
  96
  97   /* Test setting just one exception flag: FE_UNDERFLOW.
  98      On many architectures, this has the side-effect of also setting FE_INEXACT:
  99      arm64, arm, alpha, hppa, ia64, loongarch64, s390, sh, sparc.  */
 100   ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
 101   ASSERT (feraiseexcept (FE_UNDERFLOW) == 0);
 102   ASSERT ((fetestexcept (FE_ALL_EXCEPT) & ~FE_INEXACT) == FE_UNDERFLOW);
 103   ASSERT (fetestexcept (FE_INVALID) == 0);
 104   ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
 105   ASSERT (fetestexcept (FE_OVERFLOW) == 0);
 106   ASSERT (fetestexcept (FE_UNDERFLOW) == FE_UNDERFLOW);
 107
 108   /* Test setting just one exception flag: FE_INEXACT.  */
 109   ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
 110   ASSERT (feraiseexcept (FE_INEXACT) == 0);
 111   ASSERT (fetestexcept (FE_ALL_EXCEPT) == FE_INEXACT);
 112   ASSERT (fetestexcept (FE_INVALID) == 0);
 113   ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
 114   ASSERT (fetestexcept (FE_OVERFLOW) == 0);
 115   ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
 116   ASSERT (fetestexcept (FE_INEXACT) == FE_INEXACT);
 117
 118
 119   /* Test clearing just one exception flag: FE_INVALID.  */
 120   ASSERT (feraiseexcept (FE_ALL_EXCEPT) == 0);
 121   ASSERT (feclearexcept (FE_INVALID) == 0);
 122   ASSERT (/* with the libc's feraiseexcept(): */
 123           fetestexcept (FE_ALL_EXCEPT) == (FE_ALL_EXCEPT & ~FE_INVALID)
 124           || /* with gnulib's feraiseexcept(): */
 125              fetestexcept (FE_ALL_EXCEPT)
 126              == (FE_DIVBYZERO | FE_INEXACT | FE_OVERFLOW | FE_UNDERFLOW));
 127   ASSERT (fetestexcept (FE_INVALID) == 0);
 128   ASSERT (fetestexcept (FE_DIVBYZERO) == FE_DIVBYZERO);
 129   ASSERT (fetestexcept (FE_OVERFLOW) == FE_OVERFLOW);
 130   ASSERT (fetestexcept (FE_UNDERFLOW) == FE_UNDERFLOW);
 131   ASSERT (fetestexcept (FE_INEXACT) == FE_INEXACT);
 132
 133   /* Test clearing just one exception flag: FE_DIVBYZERO.  */
 134   ASSERT (feraiseexcept (FE_ALL_EXCEPT) == 0);
 135   ASSERT (feclearexcept (FE_DIVBYZERO) == 0);
 136   ASSERT (/* with the libc's feraiseexcept(): */
 137           fetestexcept (FE_ALL_EXCEPT) == (FE_ALL_EXCEPT & ~FE_DIVBYZERO)
 138           || /* with gnulib's feraiseexcept(): */
 139              (fetestexcept (FE_ALL_EXCEPT) & ~FE_VXSOFT)
 140              == (FE_INEXACT | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW));
 141   ASSERT (fetestexcept (FE_INVALID) == FE_INVALID);
 142   ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
 143   ASSERT (fetestexcept (FE_OVERFLOW) == FE_OVERFLOW);
 144   ASSERT (fetestexcept (FE_UNDERFLOW) == FE_UNDERFLOW);
 145   ASSERT (fetestexcept (FE_INEXACT) == FE_INEXACT);
 146
 147   /* Test clearing just one exception flag: FE_OVERFLOW.  */
 148   ASSERT (feraiseexcept (FE_ALL_EXCEPT) == 0);
 149   ASSERT (feclearexcept (FE_OVERFLOW) == 0);
 150   ASSERT (/* with the libc's feraiseexcept(): */
 151           fetestexcept (FE_ALL_EXCEPT) == (FE_ALL_EXCEPT & ~FE_OVERFLOW)
 152           || /* with gnulib's feraiseexcept(): */
 153              (fetestexcept (FE_ALL_EXCEPT) & ~FE_VXSOFT)
 154              == (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | FE_UNDERFLOW));
 155   ASSERT (fetestexcept (FE_INVALID) == FE_INVALID);
 156   ASSERT (fetestexcept (FE_DIVBYZERO) == FE_DIVBYZERO);
 157   ASSERT (fetestexcept (FE_OVERFLOW) == 0);
 158   ASSERT (fetestexcept (FE_UNDERFLOW) == FE_UNDERFLOW);
 159   ASSERT (fetestexcept (FE_INEXACT) == FE_INEXACT);
 160
 161   /* Test clearing just one exception flag: FE_UNDERFLOW.  */
 162   ASSERT (feraiseexcept (FE_ALL_EXCEPT) == 0);
 163   ASSERT (feclearexcept (FE_UNDERFLOW) == 0);
 164   ASSERT (/* with the libc's feraiseexcept(): */
 165           fetestexcept (FE_ALL_EXCEPT) == (FE_ALL_EXCEPT & ~FE_UNDERFLOW)
 166           || /* with gnulib's feraiseexcept(): */
 167              (fetestexcept (FE_ALL_EXCEPT) & ~FE_VXSOFT)
 168              == (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | FE_OVERFLOW));
 169   ASSERT (fetestexcept (FE_INVALID) == FE_INVALID);
 170   ASSERT (fetestexcept (FE_DIVBYZERO) == FE_DIVBYZERO);
 171   ASSERT (fetestexcept (FE_OVERFLOW) == FE_OVERFLOW);
 172   ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
 173   ASSERT (fetestexcept (FE_INEXACT) == FE_INEXACT);
 174
 175   /* Test clearing just one exception flag: FE_INEXACT.  */
 176   ASSERT (feraiseexcept (FE_ALL_EXCEPT) == 0);
 177   ASSERT (feclearexcept (FE_INEXACT) == 0);
 178   ASSERT (/* with the libc's feraiseexcept(): */
 179           fetestexcept (FE_ALL_EXCEPT) == (FE_ALL_EXCEPT & ~FE_INEXACT)
 180           || /* with gnulib's feraiseexcept(): */
 181              (fetestexcept (FE_ALL_EXCEPT) & ~FE_VXSOFT)
 182              == (FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW));
 183   ASSERT (fetestexcept (FE_INVALID) == FE_INVALID);
 184   ASSERT (fetestexcept (FE_DIVBYZERO) == FE_DIVBYZERO);
 185   ASSERT (fetestexcept (FE_OVERFLOW) == FE_OVERFLOW);
 186   ASSERT (fetestexcept (FE_UNDERFLOW) == FE_UNDERFLOW);
 187   ASSERT (fetestexcept (FE_INEXACT) == 0);
 188
 189
 190 #if !(defined __arm__ && defined __SOFTFP__)
 191   /* Test the effects of an operation that produces FE_INVALID.  */
 192   ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
 193   a = 0; b = 0; c = a / b;
 194   ASSERT ((fetestexcept (FE_ALL_EXCEPT) & ~FE_VXZDZ) == FE_INVALID);
 195   ASSERT (fetestexcept (FE_INVALID) == FE_INVALID);
 196   ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
 197   ASSERT (fetestexcept (FE_OVERFLOW) == 0);
 198   ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
 199   ASSERT (fetestexcept (FE_INEXACT) == 0);
 200
 201   /* Test the effects of an operation that produces FE_DIVBYZERO.  */
 202   ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
 203   a = 3; b = 0; c = a / b;
 204   ASSERT (fetestexcept (FE_ALL_EXCEPT) == FE_DIVBYZERO);
 205   ASSERT (fetestexcept (FE_INVALID) == 0);
 206   ASSERT (fetestexcept (FE_DIVBYZERO) == FE_DIVBYZERO);
 207   ASSERT (fetestexcept (FE_OVERFLOW) == 0);
 208   ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
 209   ASSERT (fetestexcept (FE_INEXACT) == 0);
 210
 211   /* Test the effects of an operation that produces FE_OVERFLOW.  */
 212   ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
 213   a = 1; for (int i = 0; i < 800; i++) a = 2.0 * a;
 214   b = 1; for (int i = 0; i < 700; i++) b = 2.0 * b;
 215   c = a * b;
 216   {
 217     int exc = fetestexcept (FE_ALL_EXCEPT);
 218     ASSERT ((FE_OVERFLOW & ~exc) == 0);
 219     ASSERT ((exc & ~(FE_OVERFLOW | FE_INEXACT)) == 0);
 220   }
 221   ASSERT (fetestexcept (FE_INVALID) == 0);
 222   ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
 223   ASSERT (fetestexcept (FE_OVERFLOW) == FE_OVERFLOW);
 224   ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
 225
 226   /* Test the effects of an operation that produces FE_UNDERFLOW.  */
 227   ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
 228   a = 1; for (int i = 0; i < 800; i++) a = 0.5 * a;
 229   b = 1; for (int i = 0; i < 700; i++) b = 0.5 * b;
 230   c = a * b;
 231   {
 232     int exc = fetestexcept (FE_ALL_EXCEPT);
 233     ASSERT ((FE_UNDERFLOW & ~exc) == 0);
 234     ASSERT ((exc & ~(FE_UNDERFLOW | FE_INEXACT)) == 0);
 235   }
 236   ASSERT (fetestexcept (FE_INVALID) == 0);
 237   ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
 238   ASSERT (fetestexcept (FE_OVERFLOW) == 0);
 239   ASSERT (fetestexcept (FE_UNDERFLOW) == FE_UNDERFLOW);
 240
 241 /* On alpha, this test works only when compiled with the GCC option
 242    '-mieee-with-inexact'.  */
 243 # if !defined __alpha
 244   /* Test the effects of an operation that produces FE_INEXACT.  */
 245   ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
 246   a = 1; b = 3; c = a / b;
 247   ASSERT (fetestexcept (FE_ALL_EXCEPT) == FE_INEXACT);
 248   ASSERT (fetestexcept (FE_INVALID) == 0);
 249   ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
 250   ASSERT (fetestexcept (FE_OVERFLOW) == 0);
 251   ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
 252   ASSERT (fetestexcept (FE_INEXACT) == FE_INEXACT);
 253 # endif
 254 #endif
 255
 256
 257   return test_exit_status;
 258 }