2014-12-06 09:41:27 +01:00
|
|
|
/* flonum_copy.c - copy a flonum
|
2016-03-12 04:07:23 +01:00
|
|
|
Copyright (C) 1987-2015 Free Software Foundation, Inc.
|
2014-12-06 09:41:27 +01:00
|
|
|
|
|
|
|
|
This file is part of GAS, the GNU Assembler.
|
|
|
|
|
|
|
|
|
|
GAS 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 3, or (at your option)
|
|
|
|
|
any later version.
|
|
|
|
|
|
|
|
|
|
GAS 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 GAS; see the file COPYING. If not, write to the Free
|
|
|
|
|
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
|
|
|
|
|
02110-1301, USA. */
|
|
|
|
|
|
|
|
|
|
#include "as.h"
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
flonum_copy (FLONUM_TYPE *in, FLONUM_TYPE *out)
|
|
|
|
|
{
|
|
|
|
|
unsigned int in_length; /* 0 origin */
|
|
|
|
|
unsigned int out_length; /* 0 origin */
|
|
|
|
|
|
|
|
|
|
out->sign = in->sign;
|
|
|
|
|
in_length = in->leader - in->low;
|
|
|
|
|
|
|
|
|
|
if (in->leader < in->low)
|
|
|
|
|
{
|
|
|
|
|
out->leader = out->low - 1; /* 0.0 case */
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
out_length = out->high - out->low;
|
|
|
|
|
/* Assume no GAPS in packing of littlenums.
|
|
|
|
|
I.e. sizeof(array) == sizeof(element) * number_of_elements. */
|
|
|
|
|
if (in_length <= out_length)
|
|
|
|
|
{
|
|
|
|
|
{
|
|
|
|
|
/* For defensive programming, zero any high-order
|
|
|
|
|
littlenums we don't need. This is destroying evidence
|
|
|
|
|
and wasting time, so why bother??? */
|
|
|
|
|
if (in_length < out_length)
|
|
|
|
|
{
|
|
|
|
|
memset ((char *) (out->low + in_length + 1), '\0',
|
|
|
|
|
out_length - in_length);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
memcpy ((void *) (out->low), (void *) (in->low),
|
|
|
|
|
((in_length + 1) * sizeof (LITTLENUM_TYPE)));
|
|
|
|
|
out->exponent = in->exponent;
|
|
|
|
|
out->leader = in->leader - in->low + out->low;
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
int shorten; /* 1-origin. Number of littlenums we drop. */
|
|
|
|
|
|
|
|
|
|
shorten = in_length - out_length;
|
|
|
|
|
/* Assume out_length >= 0 ! */
|
|
|
|
|
memcpy ((void *) (out->low), (void *) (in->low + shorten),
|
|
|
|
|
((out_length + 1) * sizeof (LITTLENUM_TYPE)));
|
|
|
|
|
out->leader = out->high;
|
|
|
|
|
out->exponent = in->exponent + shorten;
|
|
|
|
|
}
|
|
|
|
|
} /* if any significant bits */
|
|
|
|
|
}
|
