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66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
/* Round argument to nearest integral value according to current rounding
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direction.
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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 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
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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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long long int
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__llrintf (float x)
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{
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int32_t e;
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u_int32_t i, s;
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long long int result;
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x = __m81_u(__rintf) (x);
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GET_FLOAT_WORD (i, x);
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e = ((i >> 23) & 0xff) - 0x7f;
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if (e < 0)
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return 0;
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s = i;
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i &= 0x7fffff;
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i |= 0x800000;
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if (e < 63)
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{
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if (e > 55)
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result = (long long int) (i << (e - 55)) << 32;
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else if (e > 31)
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result = (((long long int) (i >> (55 - e)) << 32) | (i << (e - 23)));
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else if (e > 23)
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result = i << (e - 23);
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else
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result = i >> (23 - e);
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if (s & 0x80000000)
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result = -result;
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}
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else
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/* The number is too large or not finite. The standard leaves it
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undefined what to return when the number is too large to fit in a
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`long long int'. */
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result = -1LL;
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return result;
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}
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weak_alias (__llrintf, llrintf)
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