| 1 | /* flonum_copy.c - copy a flonum |
| 2 | Copyright (C) 1987-2018 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GAS, the GNU Assembler. |
| 5 | |
| 6 | GAS is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GAS is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GAS; see the file COPYING. If not, write to the Free |
| 18 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
| 19 | 02110-1301, USA. */ |
| 20 | |
| 21 | #include "as.h" |
| 22 | |
| 23 | void |
| 24 | flonum_copy (FLONUM_TYPE *in, FLONUM_TYPE *out) |
| 25 | { |
| 26 | unsigned int in_length; /* 0 origin */ |
| 27 | unsigned int out_length; /* 0 origin */ |
| 28 | |
| 29 | out->sign = in->sign; |
| 30 | in_length = in->leader - in->low; |
| 31 | |
| 32 | if (in->leader < in->low) |
| 33 | { |
| 34 | out->leader = out->low - 1; /* 0.0 case */ |
| 35 | } |
| 36 | else |
| 37 | { |
| 38 | out_length = out->high - out->low; |
| 39 | /* Assume no GAPS in packing of littlenums. |
| 40 | I.e. sizeof(array) == sizeof(element) * number_of_elements. */ |
| 41 | if (in_length <= out_length) |
| 42 | { |
| 43 | { |
| 44 | /* For defensive programming, zero any high-order |
| 45 | littlenums we don't need. This is destroying evidence |
| 46 | and wasting time, so why bother??? */ |
| 47 | if (in_length < out_length) |
| 48 | { |
| 49 | memset ((char *) (out->low + in_length + 1), '\0', |
| 50 | out_length - in_length); |
| 51 | } |
| 52 | } |
| 53 | memcpy ((void *) (out->low), (void *) (in->low), |
| 54 | ((in_length + 1) * sizeof (LITTLENUM_TYPE))); |
| 55 | out->exponent = in->exponent; |
| 56 | out->leader = in->leader - in->low + out->low; |
| 57 | } |
| 58 | else |
| 59 | { |
| 60 | int shorten; /* 1-origin. Number of littlenums we drop. */ |
| 61 | |
| 62 | shorten = in_length - out_length; |
| 63 | /* Assume out_length >= 0 ! */ |
| 64 | memcpy ((void *) (out->low), (void *) (in->low + shorten), |
| 65 | ((out_length + 1) * sizeof (LITTLENUM_TYPE))); |
| 66 | out->leader = out->high; |
| 67 | out->exponent = in->exponent + shorten; |
| 68 | } |
| 69 | } /* if any significant bits */ |
| 70 | } |