1 /*-------------------------------------------------------------------------
2 _divslong.c - routine for division of 32 bit long
4 Written By - Sandeep Dutta . sandeep.dutta@usa.net (1999)
6 This library is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Library General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
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 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 In other words, you are welcome to use, share and improve this program.
21 You are forbidden to forbid anyone else to use, share and improve
22 what you give them. Help stamp out software-hoarding!
23 -------------------------------------------------------------------------*/
28 #if _SDCC_MANGLES_SUPPORT_FUNS
29 unsigned long _divulong (unsigned long a, unsigned long b);
32 /* Assembler-functions are provided for:
34 mcs51 small stack-auto
37 #if !defined(SDCC_USE_XSTACK) && !defined(_SDCC_NO_ASM_LIB_FUNCS)
38 # if defined(SDCC_mcs51)
39 # if defined(SDCC_MODEL_SMALL)
40 # if defined(SDCC_STACK_AUTO)
41 # define _DIVSLONG_ASM_SMALL_AUTO
43 # define _DIVSLONG_ASM_SMALL
49 #if defined _DIVSLONG_ASM_SMALL
52 _divslong_dummy (void) _naked
63 // _divslong_PARM_2 shares the same memory with _divulong_PARM_2
64 // and is defined in _divulong.c
65 #define b0 (__divslong_PARM_2)
66 #define b1 (__divslong_PARM_2 + 1)
67 #define b2 (__divslong_PARM_2 + 2)
68 #define b3 (__divslong_PARM_2 + 3)
72 ; b3 in (__divslong_PARM_2 + 3)
75 clr F0 ; Flag 0 in PSW
76 ; available to user for general purpose
77 jnb acc.7,a_not_negative
98 jnb acc.7,b_not_negative
118 mov a,a3 ; restore a3 in acc
146 #elif defined _DIVSLONG_ASM_SMALL_AUTO
149 _divslong_dummy (void) _naked
165 clr F0 ; Flag 0 in PSW
166 ; available to user for general purpose
167 jnb acc.7,a_not_negative
188 add a,#-2 ; 2 bytes return address
189 mov r0,a ; r0 points to b3
192 jnb acc.7,b_not_negative
220 dec r0 ; r0 points to b0
248 #else // _DIVSLONG_ASM
251 _divslong (long a, long b)
255 r = _divulong((a < 0 ? -a : a),
257 if ( (a < 0) ^ (b < 0))
263 #endif // _DIVSLONG_ASM