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95b0c2c431
This patch replaces s_floor.c in sysdeps/dbl-64 with the one in sysdeps/dbl-64/wordsize-64 and removes the latter one. The code is not changed except changes in code style. Also adjusted the include path in x86_64 and sparc64 files. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/* Round double to integer away from zero.
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Copyright (C) 2011-2019 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>, 2011.
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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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/* Based on a version which carries the following copyright: */
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#define NO_MATH_REDIRECT
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#include <math.h>
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#include <math_private.h>
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#include <stdint.h>
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#include <libm-alias-double.h>
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/*
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* floor(x)
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* Return x rounded toward -inf to integral value
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* Method:
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* Bit twiddling.
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*/
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double
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__floor (double x)
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{
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int64_t i0;
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EXTRACT_WORDS64 (i0, x);
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int32_t j0 = ((i0 >> 52) & 0x7ff) - 0x3ff;
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if (__glibc_likely (j0 < 52))
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{
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if (j0 < 0)
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{
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/* return 0 * sign (x) if |x| < 1 */
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if (i0 >= 0)
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i0 = 0;
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else if ((i0 & 0x7fffffffffffffffl) != 0)
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i0 = 0xbff0000000000000l;
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}
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else
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{
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uint64_t i = 0x000fffffffffffffl >> j0;
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if ((i0 & i) == 0)
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return x; /* x is integral */
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if (i0 < 0)
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i0 += 0x0010000000000000l >> j0;
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i0 &= ~i;
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}
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INSERT_WORDS64 (x, i0);
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}
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else if (j0 == 0x400)
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return x + x; /* inf or NaN */
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return x;
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}
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#ifndef __floor
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libm_alias_double (__floor, floor)
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#endif
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