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53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
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/* Truncate argument to nearest integral value not larger than the argument.
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Copyright (C) 1997 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <math.h>
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#include "math_private.h"
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float
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__truncf (float x)
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{
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int32_t i0, j0;
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int sx;
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GET_FLOAT_WORD (i0, x);
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sx = i0 & 0x80000000;
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j0 = ((i0 >> 23) & 0xff) - 0x7f;
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if (j0 < 23)
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{
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if (j0 < 0)
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/* The magnitude of the number is < 1 so the result is +-0. */
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SET_FLOAT_WORD (x, sx);
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else
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SET_FLOAT_WORD (x, sx | i0 & ~(0x007fffff >> j0));
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}
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else
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{
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if (j0 == 0x80)
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/* x is inf or NaN. */
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return x + x;
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}
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return x;
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}
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weak_alias (__truncf, truncf)
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