forked from JACoders/OpenJK
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathftol.nasm
131 lines (95 loc) · 1.94 KB
/
ftol.nasm
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
;
; qftol -- fast floating point to long conversion.
;
segment .data
temp dd 0.0
fpucw dd 0
; Precision Control Field , 2 bits / 0x0300
; PC24 0x0000 Single precision (24 bits).
; PC53 0x0200 Double precision (53 bits).
; PC64 0x0300 Extended precision (64 bits).
; Rounding Control Field, 2 bits / 0x0C00
; RCN 0x0000 Rounding to nearest (even).
; RCD 0x0400 Rounding down (directed, minus).
; RCU 0x0800 Rounding up (directed plus).
; RC0 0x0C00 Rounding towards zero (chop mode).
; rounding towards nearest (even)
cw027F dd 0x027F ; double precision
cw037F dd 0x037F ; extended precision
; rounding towards zero (chop mode)
cw0E7F dd 0x0E7F ; double precision
cw0F7F dd 0x0F7F ; extended precision
segment .text
;
; int qftol( void ) - default control word
;
global qftol
qftol:
fistp dword [temp]
mov eax, [temp]
ret
;
; int qftol027F( void ) - DirectX FPU
;
global qftol027F
qftol027F:
fnstcw [fpucw]
fldcw [cw027F]
fistp dword [temp]
fldcw [fpucw]
mov eax, [temp]
ret
;
; int qftol037F( void ) - Linux FPU
;
global qftol037F
qftol037F:
fnstcw [fpucw]
fldcw [cw037F]
fistp dword [temp]
fldcw [fpucw]
mov eax, [temp]
ret
;
; int qftol0F7F( void ) - ANSI
;
global qftol0F7F
qftol0F7F:
fnstcw [fpucw]
fldcw [cw0F7F]
fistp dword [temp]
fldcw [fpucw]
mov eax, [temp]
ret
;
; int qftol0E7F( void )
;
global qftol0E7F
qftol0E7F:
fnstcw [fpucw]
fldcw [cw0E7F]
fistp dword [temp]
fldcw [fpucw]
mov eax, [temp]
ret
;
; long Q_ftol( float q )
;
global Q_ftol
Q_ftol:
fld dword [esp+4]
fistp dword [temp]
mov eax, [temp]
ret
;
; long qftol0F7F( float q ) - Linux FPU
;
global Q_ftol0F7F
Q_ftol0F7F:
fnstcw [fpucw]
fld dword [esp+4]
fldcw [cw0F7F]
fistp dword [temp]
fldcw [fpucw]
mov eax, [temp]
ret