aboutsummaryrefslogtreecommitdiffstats
path: root/code/asm/ftola.s
blob: 7e9c523ec61d2da3ff5c9ef3cdb13c13752284fb (plain)
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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.

This file is part of Quake III Arena source code.

Quake III Arena source code 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 of the License,
or (at your option) any later version.

Quake III Arena source code 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 Foobar; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/

//
// qftol -- fast floating point to long conversion.
//

// 23/09/05 Ported to gas by intel2gas, best supporting actor Tim Angus
// <tim@ngus.net>

#include "qasm.h"

#if id386

.data

temp:   .single   0.0
fpucw:  .long     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: .long     0x027F
cw037F: .long     0x037F

// rounding towards zero (chop mode)
cw0E7F: .long     0x0E7F
cw0F7F: .long     0x0F7F


.text

//
// int qftol( void ) - default control word
//

.globl C(qftol)

C(qftol):
        fistpl temp
        movl temp,%eax
        ret


//
// int qftol027F( void ) - DirectX FPU
//

.globl C(qftol027F)

C(qftol027F):
        fnstcw fpucw
        fldcw  cw027F
        fistpl temp
        fldcw  fpucw
        movl temp,%eax
        ret

//
// int qftol037F( void ) - Linux FPU
//

.globl C(qftol037F)

C(qftol037F):
        fnstcw fpucw
        fldcw  cw037F
        fistpl temp
        fldcw  fpucw
        movl temp,%eax
        ret


//
// int qftol0F7F( void ) - ANSI
//

.globl C(qftol0F7F)

C(qftol0F7F):
        fnstcw fpucw
        fldcw  cw0F7F
        fistpl temp
        fldcw  fpucw
        movl temp,%eax
        ret

//
// int qftol0E7F( void )
//

.globl C(qftol0E7F)

C(qftol0E7F):
        fnstcw fpucw
        fldcw  cw0E7F
        fistpl temp
        fldcw  fpucw
        movl temp,%eax
        ret



//
// long Q_ftol( float q )
//

.globl C(Q_ftol)

C(Q_ftol):
        flds 4(%esp)
        fistpl temp
        movl temp,%eax
        ret


//
// long qftol0F7F( float q ) - Linux FPU
//

.globl C(Q_ftol0F7F)

C(Q_ftol0F7F):
        fnstcw fpucw
        flds 4(%esp)
        fldcw  cw0F7F
        fistpl temp
        fldcw  fpucw
        movl temp,%eax
        ret
#endif