0,0 → 1,71 |
/* flonum_copy.c - copy a flonum |
Copyright 1987, 1990, 1991, 1992, 1993, 2000, 2003, 2005, 2007 |
Free Software Foundation, Inc. |
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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. */ |
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#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 */ |
} |