From abfbdde177c3a7155070dda1b2cdc8292054cc26 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Wed, 14 Jul 1999 00:54:57 +0000 Subject: Update. --- sysdeps/ieee754/flt-32/s_remquof.c | 108 +++++++++++++++++++++++++++++++++++++ 1 file changed, 108 insertions(+) create mode 100644 sysdeps/ieee754/flt-32/s_remquof.c (limited to 'sysdeps/ieee754/flt-32/s_remquof.c') diff --git a/sysdeps/ieee754/flt-32/s_remquof.c b/sysdeps/ieee754/flt-32/s_remquof.c new file mode 100644 index 0000000000..2ffd16c903 --- /dev/null +++ b/sysdeps/ieee754/flt-32/s_remquof.c @@ -0,0 +1,108 @@ +/* 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 , 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 + +#include "math_private.h" + + +static const float zero = 0.0; + + +float +__remquof (float x, float y, int *quo) +{ + int32_t hx,hy; + u_int32_t sx; + int cquo, qs; + + GET_FLOAT_WORD (hx, x); + GET_FLOAT_WORD (hy, y); + sx = hx & 0x80000000; + qs = sx ^ (hy & 0x80000000); + hy &= 0x7fffffff; + hx &= 0x7fffffff; + + /* Purge off exception values. */ + if (hy == 0) + return (x * y) / (x * y); /* y = 0 */ + if ((hx >= 0x7f800000) /* x not finite */ + || (hy > 0x7f800000)) /* y is NaN */ + return (x * y) / (x * y); + + if (hy <= 0x7dffffff) + x = __ieee754_fmodf (x, 8 * y); /* now x < 8y */ + + if ((hx - hy) == 0) + { + *quo = qs ? -1 : 1; + return zero * x; + } + + x = fabsf (x); + y = fabsf (y); + cquo = 0; + + if (x >= 4 * y) + { + x -= 4 * y; + cquo += 4; + } + if (x >= 2 * y) + { + x -= 2 * y; + cquo += 2; + } + + if (hy < 0x01000000) + { + if (x + x > y) + { + x -= y; + ++cquo; + if (x + x >= y) + { + x -= y; + ++cquo; + } + } + } + else + { + float y_half = 0.5 * y; + if (x > y_half) + { + x -= y; + ++cquo; + if (x >= y_half) + { + x -= y; + ++cquo; + } + } + } + + *quo = qs ? -cquo : cquo; + + if (sx) + x = -x; + return x; +} +weak_alias (__remquof, remquof) -- cgit 1.4.1