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57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
/* Return the least floating-point number greater than X.
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Copyright (C) 2016-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<https://www.gnu.org/licenses/>. */
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#include <float.h>
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#include <math.h>
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#include <math_private.h>
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#include <libm-alias-double.h>
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/* Return the least floating-point number greater than X. */
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double
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__nextup (double x)
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{
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int32_t hx, ix;
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uint32_t lx;
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EXTRACT_WORDS (hx, lx, x);
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ix = hx & 0x7fffffff;
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if (((ix >= 0x7ff00000) && ((ix - 0x7ff00000) | lx) != 0)) /* x is nan. */
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return x + x;
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if ((ix | lx) == 0)
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return DBL_TRUE_MIN;
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if (hx >= 0)
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{ /* x > 0. */
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if (isinf (x))
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return x;
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lx += 1;
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if (lx == 0)
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hx += 1;
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}
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else
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{ /* x < 0. */
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if (lx == 0)
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hx -= 1;
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lx -= 1;
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}
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INSERT_WORDS (x, hx, lx);
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return x;
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}
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libm_alias_double (__nextup, nextup)
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