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41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
109 lines
2.2 KiB
C
109 lines
2.2 KiB
C
/* Compute remainder and a congruent to the quotient.
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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 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <math.h>
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#include "math_private.h"
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static const float zero = 0.0;
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float
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__remquof (float x, float y, int *quo)
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{
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int32_t hx,hy;
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u_int32_t sx;
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int cquo, qs;
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GET_FLOAT_WORD (hx, x);
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GET_FLOAT_WORD (hy, y);
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sx = hx & 0x80000000;
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qs = sx ^ (hy & 0x80000000);
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hy &= 0x7fffffff;
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hx &= 0x7fffffff;
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/* Purge off exception values. */
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if (hy == 0)
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return (x * y) / (x * y); /* y = 0 */
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if ((hx >= 0x7f800000) /* x not finite */
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|| (hy > 0x7f800000)) /* y is NaN */
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return (x * y) / (x * y);
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if (hy <= 0x7dffffff)
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x = __ieee754_fmodf (x, 8 * y); /* now x < 8y */
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if ((hx - hy) == 0)
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{
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*quo = qs ? -1 : 1;
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return zero * x;
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}
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x = fabsf (x);
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y = fabsf (y);
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cquo = 0;
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if (x >= 4 * y)
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{
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x -= 4 * y;
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cquo += 4;
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}
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if (x >= 2 * y)
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{
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x -= 2 * y;
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cquo += 2;
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}
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if (hy < 0x01000000)
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{
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if (x + x > y)
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{
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x -= y;
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++cquo;
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if (x + x >= y)
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{
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x -= y;
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++cquo;
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}
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}
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}
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else
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{
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float y_half = 0.5 * y;
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if (x > y_half)
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{
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x -= y;
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++cquo;
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if (x >= y_half)
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{
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x -= y;
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++cquo;
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}
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}
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}
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*quo = qs ? -cquo : cquo;
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if (sx)
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x = -x;
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return x;
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}
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weak_alias (__remquof, remquof)
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