mirror of
https://sourceware.org/git/glibc.git
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5649a1d60d
1997-06-04 20:57 Ulrich Drepper <drepper@cygnus.com>
* manual/string.texi: Add comments to discourage use of index and
rindex.
(strtok, strsep): Apply function on copy of the strings in example.
(l64a): Add example.
* posix/unistd.h: Correct value for _POSIX_VERSION.
* sunrpc/Makefile (defines): Remove definition.
* sysdeps/ieee754/nan.h: Correct typo.
1997-06-04 10:50 Fila Kolodny <fila@ibi.com>
* posix/unistd.h: Add definition of __fchdir corresponding to fchdir.
* login/utmp_daemon.c: Correct location of utmpd.h.
1997-06-03 19:16 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* Makerules: Rename $(common-objpfx)distinfo-$(subdir) to
$(objpfx)distinfo.
* rpm/Makefile (distinfo): Adapted.
1997-06-03 18:32 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* rpm/Makefile (install-slib): Collect shared libraries here
instead of in install-lib, including libc.
(instvars): Add slib.
1997-06-03 18:23 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* login/Makefile (libutil-routines): Add updwtmp.
1997-06-03 16:16 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* monetary.h: New file, needed for localedata/tst-fmon.c.
1997-06-02 20:31 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* math/libm-test.c (cpow_test): Add epsilon for long double in
test for 2^10.
(identities): Add epsilon for float in second identity test.
* sysdeps/m68k/huge_val.h: Change GCC's HUGE_VAL{,F,L} to use
DI and SI mode integers instead of bytes. Fix value of HUGE_VALL.
* sysdeps/m68k/nan.h: New file.
* sysdeps/m68k/fpu/__math.h (isgreater, isgreaterequal, isless,
islessequal, islessgreater, isunordered): Fix assembler syntax.
* sysdeps/m68k/fpu/fraiseexcpt.c: Do it right so that gcc doesn't
optimize out the operations.
* sysdeps/libm-ieee754/s_nan.c: Use NaN macro instead of static
constant.
* sysdeps/libm-ieee754/s_nanf.c: Likewise.
* sysdeps/libm-ieee754/s_nanl.c: Likewise.
* math/carg.c [NO_LONG_DOUBLE]: Add alias for long double
function.
* sysdeps/libm-ieee754/s_erf.c: Likewise.
* sysdeps/libm-ieee754/s_fdim.c: Likewise.
* sysdeps/libm-ieee754/s_fmax.c: Likewise.
* sysdeps/libm-ieee754/s_fmin.c: Likewise.
* sysdeps/libm-ieee754/s_log2.c: Likewise.
* sysdeps/libm-ieee754/s_nan.c: Likewise.
* sysdeps/libm-ieee754/s_remquo.c: Likewise.
117 lines
2.4 KiB
C
117 lines
2.4 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 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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static const double zero = 0.0;
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double
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__remquo (double x, double y, int *quo)
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{
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int32_t hx,hy;
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u_int32_t sx,lx,ly;
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int cquo, qs;
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EXTRACT_WORDS (hx, lx, x);
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EXTRACT_WORDS (hy, ly, 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 | ly) == 0)
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return (x * y) / (x * y); /* y = 0 */
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if ((hx >= 0x7ff00000) /* x not finite */
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|| ((hy >= 0x7ff00000) /* p is NaN */
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&& (((hy - 0x7ff00000) | ly) != 0)))
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return (x * y) / (x * y);
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if (hy <= 0x7fbfffff)
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x = __ieee754_fmod (x, 8 * y); /* now x < 8y */
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if (((hx - hy) | (lx - ly)) == 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 = fabs (x);
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y = fabs (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 (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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if (hy < 0x00200000)
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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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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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double 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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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 (__remquo, remquo)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__remquo, __remquol)
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weak_alias (__remquo, remquol)
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#endif
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