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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
#ifndef _SOFT_FLOAT
.global feclearexcept
.type feclearexcept,@function
feclearexcept:
andis. 3,3,0x3e00
/* if (r3 & FE_INVALID) r3 |= all_invalid_flags */
andis. 0,3,0x2000
stwu 1,-16(1)
beq- 0,1f
oris 3,3,0x01f8
ori 3,3,0x0700
1:
/*
* note: fpscr contains various fpu status and control
* flags and we dont check if r3 may alter other flags
* than the exception related ones
* ufpscr &= ~r3
*/
mffs 0
stfd 0,8(1)
lwz 9,12(1)
andc 9,9,3
stw 9,12(1)
lfd 0,8(1)
mtfsf 255,0
/* return 0 */
li 3,0
addi 1,1,16
blr
.global feraiseexcept
.type feraiseexcept,@function
feraiseexcept:
andis. 3,3,0x3e00
/* if (r3 & FE_INVALID) r3 |= software_invalid_flag */
andis. 0,3,0x2000
stwu 1,-16(1)
beq- 0,1f
ori 3,3,0x0400
1:
/* fpscr |= r3 */
mffs 0
stfd 0,8(1)
lwz 9,12(1)
or 9,9,3
stw 9,12(1)
lfd 0,8(1)
mtfsf 255,0
/* return 0 */
li 3,0
addi 1,1,16
blr
.global fetestexcept
.type fetestexcept,@function
fetestexcept:
andis. 3,3,0x3e00
/* return r3 & fpscr */
stwu 1,-16(1)
mffs 0
stfd 0,8(1)
lwz 9,12(1)
addi 1,1,16
and 3,3,9
blr
.global fegetround
.type fegetround,@function
fegetround:
/* return fpscr & 3 */
stwu 1,-16(1)
mffs 0
stfd 0,8(1)
lwz 3,12(1)
addi 1,1,16
clrlwi 3,3,30
blr
.global __fesetround
.type __fesetround,@function
__fesetround:
/*
* note: invalid input is not checked, r3 < 4 must hold
* fpscr = (fpscr & -4U) | r3
*/
stwu 1,-16(1)
mffs 0
stfd 0,8(1)
lwz 9,12(1)
clrrwi 9,9,2
or 9,9,3
stw 9,12(1)
lfd 0,8(1)
mtfsf 255,0
/* return 0 */
li 3,0
addi 1,1,16
blr
.global fegetenv
.type fegetenv,@function
fegetenv:
/* *r3 = fpscr */
mffs 0
stfd 0,0(3)
/* return 0 */
li 3,0
blr
.global fesetenv
.type fesetenv,@function
fesetenv:
cmpwi 3, -1
bne 1f
mflr 4
bl 2f
.zero 8
2: mflr 3
mtlr 4
1: /* fpscr = *r3 */
lfd 0,0(3)
mtfsf 255,0
/* return 0 */
li 3,0
blr
#endif
|
