265 lines
4.3 KiB
C
265 lines
4.3 KiB
C
/*-------------------------------------------------------------------------
|
|
_divslong.c - routine for division of 32 bit long
|
|
|
|
Written By - Sandeep Dutta . sandeep.dutta@usa.net (1999)
|
|
|
|
This library is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU Library General Public License as published by the
|
|
Free Software Foundation; either version 2, or (at your option) any
|
|
later version.
|
|
|
|
This library 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 Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
|
|
In other words, you are welcome to use, share and improve this program.
|
|
You are forbidden to forbid anyone else to use, share and improve
|
|
what you give them. Help stamp out software-hoarding!
|
|
-------------------------------------------------------------------------*/
|
|
|
|
#ifndef GBDK
|
|
#include <sdcc-lib.h>
|
|
#endif
|
|
|
|
#if _SDCC_MANGLES_SUPPORT_FUNS || GBDK
|
|
unsigned long _divulong (unsigned long a, unsigned long b);
|
|
#endif
|
|
|
|
/* Assembler-functions are provided for:
|
|
mcs51 small
|
|
mcs51 small stack-auto
|
|
*/
|
|
|
|
#if !defined(SDCC_USE_XSTACK) && !defined(_SDCC_NO_ASM_LIB_FUNCS)
|
|
# if defined(SDCC_mcs51)
|
|
# if defined(SDCC_MODEL_SMALL)
|
|
# if defined(SDCC_STACK_AUTO)
|
|
# define _DIVSLONG_ASM_SMALL_AUTO
|
|
# else
|
|
# define _DIVSLONG_ASM_SMALL
|
|
# endif
|
|
# endif
|
|
# endif
|
|
#endif
|
|
|
|
#if defined _DIVSLONG_ASM_SMALL
|
|
|
|
static void
|
|
_divslong_dummy (void) _naked
|
|
{
|
|
_asm
|
|
|
|
#define a0 dpl
|
|
#define a1 dph
|
|
#define a2 b
|
|
#define a3 r3
|
|
|
|
.globl __divslong
|
|
|
|
// _divslong_PARM_2 shares the same memory with _divulong_PARM_2
|
|
// and is defined in _divulong.c
|
|
#define b0 (__divslong_PARM_2)
|
|
#define b1 (__divslong_PARM_2 + 1)
|
|
#define b2 (__divslong_PARM_2 + 2)
|
|
#define b3 (__divslong_PARM_2 + 3)
|
|
|
|
__divslong:
|
|
; a3 in acc
|
|
; b3 in (__divslong_PARM_2 + 3)
|
|
mov a3,a ; save a3
|
|
|
|
clr F0 ; Flag 0 in PSW
|
|
; available to user for general purpose
|
|
jnb acc.7,a_not_negative
|
|
|
|
setb F0
|
|
|
|
clr a
|
|
clr c
|
|
subb a,a0
|
|
mov a0,a
|
|
clr a
|
|
subb a,a1
|
|
mov a1,a
|
|
clr a
|
|
subb a,a2
|
|
mov a2,a
|
|
clr a
|
|
subb a,a3
|
|
mov a3,a
|
|
|
|
a_not_negative:
|
|
|
|
mov a,b3
|
|
jnb acc.7,b_not_negative
|
|
|
|
cpl F0
|
|
|
|
clr a
|
|
clr c
|
|
subb a,b0
|
|
mov b0,a
|
|
clr a
|
|
subb a,b1
|
|
mov b1,a
|
|
clr a
|
|
subb a,b2
|
|
mov b2,a
|
|
clr a
|
|
subb a,b3
|
|
mov b3,a
|
|
|
|
b_not_negative:
|
|
|
|
mov a,a3 ; restore a3 in acc
|
|
|
|
lcall __divulong
|
|
|
|
jnb F0,not_negative
|
|
|
|
mov a3,a ; save a3
|
|
|
|
clr a
|
|
clr c
|
|
subb a,a0
|
|
mov a0,a
|
|
clr a
|
|
subb a,a1
|
|
mov a1,a
|
|
clr a
|
|
subb a,a2
|
|
mov a2,a
|
|
clr a
|
|
subb a,a3
|
|
mov a3,a
|
|
|
|
not_negative:
|
|
ret
|
|
|
|
_endasm ;
|
|
}
|
|
|
|
#elif defined _DIVSLONG_ASM_SMALL_AUTO
|
|
|
|
static void
|
|
_divslong_dummy (void) _naked
|
|
{
|
|
_asm
|
|
|
|
#define a0 dpl
|
|
#define a1 dph
|
|
#define a2 b
|
|
#define a3 r3
|
|
|
|
.globl __divslong
|
|
|
|
__divslong:
|
|
|
|
; a3 in acc
|
|
mov a3,a ; save a3
|
|
|
|
clr F0 ; Flag 0 in PSW
|
|
; available to user for general purpose
|
|
jnb acc.7,a_not_negative
|
|
|
|
setb F0
|
|
|
|
clr a
|
|
clr c
|
|
subb a,a0
|
|
mov a0,a
|
|
clr a
|
|
subb a,a1
|
|
mov a1,a
|
|
clr a
|
|
subb a,a2
|
|
mov a2,a
|
|
clr a
|
|
subb a,a3
|
|
mov a3,a
|
|
|
|
a_not_negative:
|
|
|
|
mov a,sp
|
|
add a,#-2 ; 2 bytes return address
|
|
mov r0,a ; r0 points to b3
|
|
mov a,@r0 ; b3
|
|
|
|
jnb acc.7,b_not_negative
|
|
|
|
cpl F0
|
|
|
|
dec r0
|
|
dec r0
|
|
dec r0
|
|
|
|
clr a
|
|
clr c
|
|
subb a,@r0 ; b0
|
|
mov @r0,a
|
|
clr a
|
|
inc r0
|
|
subb a,@r0 ; b1
|
|
mov @r0,a
|
|
clr a
|
|
inc r0
|
|
subb a,@r0 ; b2
|
|
mov @r0,a
|
|
clr a
|
|
inc r0
|
|
subb a,@r0 ; b3
|
|
mov @r0,a
|
|
|
|
b_not_negative:
|
|
dec r0
|
|
dec r0
|
|
dec r0 ; r0 points to b0
|
|
|
|
lcall __divlong
|
|
|
|
jnb F0,not_negative
|
|
|
|
mov a3,a ; save a3
|
|
|
|
clr a
|
|
clr c
|
|
subb a,a0
|
|
mov a0,a
|
|
clr a
|
|
subb a,a1
|
|
mov a1,a
|
|
clr a
|
|
subb a,a2
|
|
mov a2,a
|
|
clr a
|
|
subb a,a3
|
|
mov a3,a
|
|
|
|
not_negative:
|
|
ret
|
|
|
|
_endasm ;
|
|
}
|
|
|
|
#else // _DIVSLONG_ASM
|
|
|
|
long
|
|
_divslong (long a, long b)
|
|
{
|
|
long r;
|
|
|
|
r = _divulong((a < 0 ? -a : a),
|
|
(b < 0 ? -b : b));
|
|
if ( (a < 0) ^ (b < 0))
|
|
return -r;
|
|
else
|
|
return r;
|
|
}
|
|
|
|
#endif // _DIVSLONG_ASM
|