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82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/* Tests of quiet not-a-number.
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Copyright (C) 2023-2026 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2023. */
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#include <config.h>
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/* Specification. */
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#include "nan.h"
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#if defined __GLIBC__ && defined __arm__ && defined __SOFTFP__
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# include <stdio.h>
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/* The arm software floating-point emulation (used e.g. on armv5) does not set
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the floating-point exception bits. */
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int
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main ()
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{
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fputs ("Skipping test: software floating-point emulation\n", stderr);
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return 77;
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}
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#else
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# include <fenv.h>
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# include "macros.h"
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float volatile resultf;
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double volatile resultd;
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long double volatile resultl;
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int
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main ()
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{
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/* Fetch the NaN values before we start watching out for FE_INVALID
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exceptions, because the division 0.0 / 0.0 itself also raises an
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FE_INVALID exception.
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The use of 'volatile' prevents the compiler from doing constant-folding
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optimizations on these values. An alternative, for GCC only, would be
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the command-line option '-fsignaling-nans'. */
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float volatile nanf = NaNf ();
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double volatile nand = NaNd ();
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long double volatile nanl = NaNl ();
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/* Check that the values are really quiet. */
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{
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feclearexcept (FE_INVALID);
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resultf = nanf + 42.0f;
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ASSERT (!fetestexcept (FE_INVALID));
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}
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{
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feclearexcept (FE_INVALID);
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resultd = nand + 42.0;
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ASSERT (!fetestexcept (FE_INVALID));
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}
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{
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feclearexcept (FE_INVALID);
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resultl = nanl + 42.0L;
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ASSERT (!fetestexcept (FE_INVALID));
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}
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return test_exit_status;
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}
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#endif
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