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44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/* Return positive difference between arguments.
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Copyright (C) 1997-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <math.h>
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float
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__fdimf (float x, float y)
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{
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int clsx = fpclassify (x);
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int clsy = fpclassify (y);
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if (clsx == FP_NAN || clsy == FP_NAN)
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/* Raise invalid flag for signaling but not quiet NaN. */
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return x - y;
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if (x <= y)
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return 0.0f;
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float r = x - y;
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if (fpclassify (r) == FP_INFINITE
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&& clsx != FP_INFINITE && clsy != FP_INFINITE)
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__set_errno (ERANGE);
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return r;
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}
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weak_alias (__fdimf, fdimf)
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