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63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
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/* 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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#define __LIBC_M81_MATH_INLINES
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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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__llrint (long double x)
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{
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int32_t se, sx;
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u_int32_t h, l;
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long long int result;
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x = __m81_u(__rintl) (x);
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/* We could use __fixxfdi from libgcc, but here we can take advantage of
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the known floating point format. */
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GET_LDOUBLE_WORDS (se, h, l, x);
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sx = se & (1 << 15);
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se = (se ^ sx) - 0x3fff;
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if (se < 64)
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{
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if (se > 31)
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result = (((long long int) (h >> (63 - se)) << 32)
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| (l >> (63 - se)) | (h << (se - 31)));
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else
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result = h >> (31 - se);
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if (sx)
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result = -result;
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}
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else
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/* Too large. The number is either +-inf or NaN or it is too
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large to be effected by rounding. The standard leaves it
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undefined what to return when the number is too large to fit in
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a `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 (__llrint, llrint)
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