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68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
/* Test of rounding towards negative infinity.
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Copyright (C) 2010-2026 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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#include <config.h>
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#include <math.h>
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#include "isnanf-nolibm.h"
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#include "minus-zero.h"
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#include "infinity.h"
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#include "nan.h"
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#include "macros.h"
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/* If IEEE compliance was not requested, the ICC compiler inlines its
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own floorf assembly that turns -0.0f to 0.0f; but that is a correct
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result when IEEE is not enforced. To avoid spurious failure, we
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have to provide this dummy function in order to outsmart ICC's
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inlining, and call our floorf through a function pointer. */
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static float
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dummy (float f)
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{
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return 0;
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}
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int
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main (int argc, _GL_UNUSED char **argv)
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{
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float (* volatile my_floorf) (float) = argc ? floorf : dummy;
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/* See IEEE 754, section 6.3:
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"the sign of the result of the round floating-point number to
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integral value operation is the sign of the operand. These rules
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shall apply even when operands or results are zero or infinite." */
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/* Zero. */
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ASSERT (!signbit (my_floorf (0.0f)));
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ASSERT (!!signbit (my_floorf (minus_zerof)) == !!signbit (minus_zerof));
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/* Positive numbers. */
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ASSERT (!signbit (my_floorf (0.3f)));
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ASSERT (!signbit (my_floorf (0.7f)));
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/* Negative numbers. */
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ASSERT (!!signbit (my_floorf (-0.3f)) == !!signbit (minus_zerof));
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ASSERT (!!signbit (my_floorf (-0.7f)) == !!signbit (minus_zerof));
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/* [MX] shaded specification in POSIX. */
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/* NaN. */
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ASSERT (isnanf (floorf (NaNf ())));
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/* Infinity. */
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ASSERT (floorf (Infinityf ()) == Infinityf ());
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ASSERT (floorf (- Infinityf ()) == - Infinityf ());
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return test_exit_status;
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}
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