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
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/*-------------------------------------------------------------------------
_fsnormalize.c - Floating point library in optimized assembly for 8051
Copyright (c) 2004, Paul Stoffregen, paul@pjrc.com
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this library; see the file COPYING. If not, write to the
Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA.
As a special exception, if you link this library with other files,
some of which are compiled with SDCC, to produce an executable,
this library does not by itself cause the resulting executable to
be covered by the GNU General Public License. This exception does
not however invalidate any other reasons why the executable file
might be covered by the GNU General Public License.
-------------------------------------------------------------------------*/
#define __SDCC_FLOAT_LIB
#include <float.h>
#ifdef FLOAT_ASM_MCS51
static void dummy(void) __naked
{
__asm
.globl fs_normalize_a
fs_normalize_a:
#ifdef FLOAT_SHIFT_SPEEDUP
mov r0, #4
mov a, r4
00001$:
jnz 00003$
mov a, exp_a
add a, #248
jnc 00002$ ;denormalized
mov exp_a, a
clr a
xch a, r1
xch a, r2
xch a, r3
mov r4, a
//mov r4, ar3
//mov r3, ar2
//mov r2, ar1
//mov r1, #0
djnz r0, 00001$
ret
#endif
00002$:
mov a, r4
00003$:
mov r0, #32
inc exp_a
00004$:
jb acc.7, 00006$
djnz exp_a, 00005$
ret ;denormalized
00005$:
clr c
mov a, r1
rlc a
mov r1, a
mov a, r2
rlc a
mov r2, a
mov a, r3
rlc a
mov r3, a
mov a, r4
rlc a
mov r4, a
djnz r0, 00004$
00006$:
dec exp_a
ret
__endasm;
}
#endif
|
