mirror of
https://github.com/vale981/arb
synced 2025-03-06 01:41:39 -05:00
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/*=============================================================================
|
|
|
|
This file is part of ARB.
|
|
|
|
ARB is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
ARB 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with ARB; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
=============================================================================*/
|
|
/******************************************************************************
|
|
|
|
Copyright (C) 2013 Fredrik Johansson
|
|
|
|
******************************************************************************/
|
|
|
|
#include "fmprb.h"
|
|
|
|
#define TRIM_PADDING 16
|
|
|
|
void
|
|
fmprb_trim(fmprb_t y, const fmprb_t x)
|
|
{
|
|
if (fmpr_is_zero(fmprb_radref(x)) || fmpr_is_special(fmprb_midref(x)))
|
|
{
|
|
fmprb_set(y, x);
|
|
}
|
|
else if (fmpr_is_special(fmprb_radref(x)))
|
|
{
|
|
/* midpoint must be finite, so set to 0 +/- inf */
|
|
fmprb_zero_pm_inf(y);
|
|
}
|
|
else
|
|
{
|
|
slong bits, accuracy;
|
|
|
|
bits = fmprb_bits(x);
|
|
accuracy = fmprb_rel_accuracy_bits(x);
|
|
|
|
if (accuracy < -TRIM_PADDING)
|
|
{
|
|
/* set to 0 +/- rad */
|
|
if (fmpr_sgn(fmprb_midref(x)) < 0)
|
|
fmpr_sub(fmprb_radref(y), fmprb_radref(x), fmprb_midref(x), FMPRB_RAD_PREC, FMPR_RND_UP);
|
|
else
|
|
fmpr_add(fmprb_radref(y), fmprb_radref(x), fmprb_midref(x), FMPRB_RAD_PREC, FMPR_RND_UP);
|
|
fmpr_zero(fmprb_midref(y));
|
|
}
|
|
else if (accuracy < bits - TRIM_PADDING)
|
|
{
|
|
fmprb_set_round(y, x, FLINT_MAX(0, accuracy) + TRIM_PADDING);
|
|
}
|
|
else
|
|
{
|
|
fmprb_set(y, x);
|
|
}
|
|
}
|
|
}
|
|
|