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99dee823 | 1 | ; Copyright (C) 2017-2021 Free Software Foundation, Inc. |
8cb41ec6 SP |
2 | ; Contributed by Sebastian Perta. |
3 | ; | |
4 | ; This file is free software; you can redistribute it and/or modify it | |
5 | ; under the terms of the GNU General Public License as published by the | |
6 | ; Free Software Foundation; either version 3, or (at your option) any | |
7 | ; later version. | |
8 | ; | |
9 | ; This file is distributed in the hope that it will be useful, but | |
10 | ; WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | ; General Public License for more details. | |
13 | ; | |
14 | ; Under Section 7 of GPL version 3, you are granted additional | |
15 | ; permissions described in the GCC Runtime Library Exception, version | |
16 | ; 3.1, as published by the Free Software Foundation. | |
17 | ; | |
18 | ; You should have received a copy of the GNU General Public License and | |
19 | ; a copy of the GCC Runtime Library Exception along with this program; | |
20 | ; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
21 | ; <http://www.gnu.org/licenses/>. | |
22 | ||
23 | ||
24 | #include "vregs.h" | |
25 | ||
26 | .text | |
27 | ||
28 | START_FUNC ___adddi3 | |
29 | ||
30 | movw hl, sp ; use HL-based addressing (allows for direct addw) | |
31 | ||
32 | movw ax, [hl+4] | |
33 | addw ax, [hl+12] | |
34 | movw r8, ax | |
35 | ||
36 | mov a, [hl+6] ; middle bytes of the result are determined using 8-bit | |
37 | addc a, [hl+14] ; ADDC insns which both account for and update the carry bit | |
38 | mov r10, a ; (no ADDWC instruction is available) | |
39 | mov a, [hl+7] | |
40 | addc a, [hl+15] | |
41 | mov r11, a | |
42 | ||
43 | mov a, [hl+8] | |
44 | addc a, [hl+16] | |
45 | mov r12, a | |
46 | mov a, [hl+9] | |
47 | addc a, [hl+17] | |
48 | mov r13, a | |
49 | ||
50 | movw ax, [hl+10] | |
51 | sknc ; account for the possible carry from the | |
52 | incw ax ; latest 8-bit operation | |
53 | addw ax, [hl+18] | |
54 | movw r14, ax | |
55 | ||
56 | ret | |
57 | ||
58 | END_FUNC ___adddi3 |