diff options
Diffstat (limited to 'sysdeps/ieee754/ldbl-96/s_remquol.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-96/s_remquol.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/sysdeps/ieee754/ldbl-96/s_remquol.c b/sysdeps/ieee754/ldbl-96/s_remquol.c new file mode 100644 index 0000000000..88ff298eb6 --- /dev/null +++ b/sysdeps/ieee754/ldbl-96/s_remquol.c @@ -0,0 +1,109 @@ +/* Compute remainder and a congruent to the quotient. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <math.h> + +#include "math_private.h" + + +static const long double zero = 0.0; + + +long double +__remquol (long double x, long double p, int *quo) +{ + int32_t ex,ep,hx,hp; + u_int32_t sx,lx,lp; + int cquo,qs; + + GET_LDOUBLE_WORDS (ex, hx, lx, x); + GET_LDOUBLE_WORDS (ep, hp, lp, p); + sx = ex & 0x8000; + qs = (sx ^ (ep & 0x8000)) >> 15; + ep &= 0x7fff; + ex &= 0x7fff; + + /* Purge off exception values. */ + if ((ep | hp | lp) == 0) + return (x * p) / (x * p); /* p = 0 */ + if ((ex == 0x7fff) /* x not finite */ + || ((ep == 0x7fff) /* p is NaN */ + && ((hp | lp) != 0))) + return (x * p) / (x * p); + + if (ep <= 0x7ffb) + x = __ieee754_fmodl (x, 8 * p); /* now x < 8p */ + + if (((ex - ep) | (hx - hp) | (lx - lp)) == 0) + { + *quo = qs ? -1 : 1; + return zero * x; + } + + x = fabsl (x); + p = fabsl (p); + cquo = 0; + + if (x >= 4 * p) + { + x -= 4 * p; + cquo += 4; + } + if (x >= 2 * p) + { + x -= 2 * p; + cquo += 2; + } + + if (ep < 0x0002) + { + if (x + x > p) + { + x -= p; + ++cquo; + if (x + x >= p) + { + x -= p; + ++cquo; + } + } + } + else + { + long double p_half = 0.5 * p; + if (x > p_half) + { + x -= p; + ++cquo; + if (x >= p_half) + { + x -= p; + ++cquo; + } + } + } + + *quo = qs ? -cquo : cquo; + + if (sx) + x = -x; + return x; +} +weak_alias (__remquol, remquol) |