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
130
|
#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
.hidden __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
|
