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52e1b618f4
2002-07-03 Jakub Jelinek <jakub@redhat.com> * stdio-common/printf_fp.c (__printf_fp.c): If _FPIO_CONST_SHIFT is non-zero, adjust exponent. * sysdeps/ieee754/ldbl-128/s_erfl.c (__erfl, erfl, __erfcl, erfcl): Remove NO_LONG_DOUBLE aliases. * sysdeps/ieee754/ldbl-128/s_expm1l.c (__expm1l, expm1l): Likewise. * sysdeps/ieee754/ldbl-128/s_log1pl.c (__log1pl, log1pl): Likewise. (__log1pl): Raise divide by zero and invalid exceptions when needed. * sysdeps/ieee754/ldbl-128/e_powl.c (__ieee754_powl): Special case 1**y and -1**+-Inf. * sysdeps/ieee754/ldbl-128/ldbl2mpn.c (__mpn_extract_long_double): Fix BITS_PER_MP_LIMB 32 extraction. * sysdeps/ieee754/ldbl-128/e_log2l.c (__ieee754_log2l): Don't raise exceptions for qNaNs. * sysdeps/ieee754/ldbl-128/e_log10l.c (__ieee754_log10l): Likewise. * sysdeps/ieee754/ldbl-128/e_lgammal_r.c (__ieee754_lgamma_r): Raise exceptions when needed. Don't recurse unnecessarily. Special case 1.0L and 2.0L arguments to avoid -0.0L as result. * sysdeps/ieee754/ldbl-128/e_j0l.c (__ieee754_y0l): Don't raise exceptions for qNaNs. * sysdeps/ieee754/ldbl-128/s_remquol.c (__remquol): Make qs 64-bit to fix *quo return value sign. * sysdeps/ieee754/ldbl-128/e_gammal_r.c (__ieee754_gamma_r): Special case -Inf argument. * soft-fp/op-4.h (_FP_FRAC_CLZ_4): Fix a pasto. 2002-07-01 Jakub Jelinek <jakub@redhat.com> * libio/tst-eof.c (do_test): Remove unused ch and tm variables. * iconvdata/iso-2022-jp-3.c (EMIT_SHIFT_TO_INIT): Kill warnings if -DNDEBUG.
111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
/* Compute remainder and a congruent to the quotient.
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Copyright (C) 1997, 1999, 2002 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 and
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Jakub Jelinek <jj@ultra.linux.cz>, 1999.
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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 long double zero = 0.0;
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long double
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__remquol (long double x, long double y, int *quo)
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{
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int64_t hx,hy;
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u_int64_t sx,lx,ly,qs;
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int cquo;
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GET_LDOUBLE_WORDS64 (hx, lx, x);
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GET_LDOUBLE_WORDS64 (hy, ly, y);
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sx = hx & 0x8000000000000000ULL;
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qs = sx ^ (hy & 0x8000000000000000ULL);
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hy &= 0x7fffffffffffffffLL;
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hx &= 0x7fffffffffffffffLL;
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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 >= 0x7fff000000000000LL) /* x not finite */
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|| ((hy >= 0x7fff000000000000LL) /* y is NaN */
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&& (((hy - 0x7fff000000000000LL) | ly) != 0)))
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return (x * y) / (x * y);
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if (hy <= 0x7ffbffffffffffffLL)
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x = __ieee754_fmodl (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 = fabsl (x);
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y = fabsl (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 < 0x0002000000000000LL)
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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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long double y_half = 0.5L * 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 (__remquol, remquol)
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