1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/* mc68020 __mpn_submul_1 -- Multiply a limb vector with a limb and subtract
the result from a second limb vector.
Copyright (C) 1992, 1994, 1996, 1998 Free Software Foundation, Inc.
This file is part of the GNU MP Library.
The GNU MP 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 of the License, or (at your
option) any later version.
The GNU MP 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 the GNU MP Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
/*
INPUT PARAMETERS
res_ptr (sp + 4)
s1_ptr (sp + 8)
s1_size (sp + 12)
s2_limb (sp + 16)
*/
#include "sysdep.h"
#include "asm-syntax.h"
TEXT
ENTRY(__mpn_submul_1)
#define res_ptr a0
#define s1_ptr a1
#define s1_size d2
#define s2_limb d4
/* Save used registers on the stack. */
moveml R(d2)-R(d5),MEM_PREDEC(sp)
/* Copy the arguments to registers. Better use movem? */
movel MEM_DISP(sp,20),R(res_ptr)
movel MEM_DISP(sp,24),R(s1_ptr)
movel MEM_DISP(sp,28),R(s1_size)
movel MEM_DISP(sp,32),R(s2_limb)
eorw #1,R(s1_size)
clrl R(d1)
clrl R(d5)
lsrl #1,R(s1_size)
bcc L(L1)
subql #1,R(s1_size)
subl R(d0),R(d0) /* (d0,cy) <= (0,0) */
L(Loop:)
movel MEM_POSTINC(s1_ptr),R(d3)
mulul R(s2_limb),R(d1):R(d3)
addxl R(d0),R(d3)
addxl R(d5),R(d1)
subl R(d3),MEM_POSTINC(res_ptr)
L(L1:) movel MEM_POSTINC(s1_ptr),R(d3)
mulul R(s2_limb),R(d0):R(d3)
addxl R(d1),R(d3)
addxl R(d5),R(d0)
subl R(d3),MEM_POSTINC(res_ptr)
dbf R(s1_size),L(Loop)
addxl R(d5),R(d0)
subl #0x10000,R(s1_size)
bcc L(Loop)
/* Restore used registers from stack frame. */
moveml MEM_POSTINC(sp),R(d2)-R(d5)
rts
END(__mpn_submul_1)
|
