gbdk-2020 | GameBoy Development Kit |
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gbdk-lib/libc/asm/z80/modmixed.s
1 ;--------------------------------------------------------------------------
2 ; modmixed.s
3 ;
4 ; Copyright (C) 2010-2021, Philipp Klaus Krause
5 ;
6 ; This library is free software; you can redistribute it and/or modify it
7 ; under the terms of the GNU General Public License as published by the
8 ; Free Software Foundation; either version 2, or (at your option) any
9 ; later version.
10 ;
11 ; This library 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 this library; see the file COPYING. If not, write to the
18 ; Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
19 ; MA 02110-1301, USA.
20 ;
21 ; As a special exception, if you link this library with other files,
22 ; some of which are compiled with SDCC, to produce an executable,
23 ; this library does not by itself cause the resulting executable to
24 ; be covered by the GNU General Public License. This exception does
25 ; not however invalidate any other reasons why the executable file
26 ; might be covered by the GNU General Public License.
27 ;--------------------------------------------------------------------------
28
29 .globl __modsuchar
30 .globl __moduschar
31
32 __modsuchar:
33 ld e, l
34 ld l, a
35 ld h, #0
36
37 call __div_signexte
38
39 jp __get_remainder
40
41 __moduschar:
42 ld e, l
43 ld d, #0
44 ld l, a
45
46 rlca ; Sign extend
47 sbc a, a
48 ld h, a
49
50 call __div16
51
52 jp __get_remainder
53
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