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
|
/*-
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if MACHINE==pica
#include <machine/asm.h>
#else
#include <machine/machAsmDefs.h>
#endif
#if defined(LIBC_SCCS) && !defined(lint)
ASMSTR("from: @(#)isinf.s 8.1 (Berkeley) 6/4/93")
ASMSTR("$Id: isinf.S,v 1.2 1996/05/16 11:16:00 pefo Exp $")
#endif /* LIBC_SCCS and not lint */
#ifdef ABICALLS
.abicalls
#endif
#define DEXP_INF 0x7ff
.set noreorder
/*
* isnan(x)
* double x;
*
* Return true if x is a NAN.
*/
LEAF(isnan)
mfc1 v1, $f13 # get MSW of x
mfc1 t3, $f12 # get LSW of x
sll t1, v1, 1 # get x exponent
srl t1, t1, 32 - 11
bne t1, DEXP_INF, 2f # is it a finite number?
sll t2, v1, 32 - 20 # get x fraction
bne t3, zero, 1f # is it a NAN?
nop
beq t2, zero, 2f # its infinity
nop
1:
j ra
li v0, 1 # x is a NAN
2:
j ra
move v0, zero # x is NOT a NAN
END(isnan)
/*
* isinf(x)
* double x;
*
* Return true if x is infinity.
*/
LEAF(isinf)
mfc1 v1, $f13 # get MSW of x
mfc1 t3, $f12 # get LSW of x
sll t1, v1, 1 # get x exponent
srl t1, t1, 32 - 11
bne t1, DEXP_INF, 1f # is it a finite number?
sll t2, v1, 32 - 20 # get x fraction
bne t3, zero, 1f # is it a NAN?
nop
bne t2, zero, 1f # is it a NAN?
nop
j ra
li v0, 1 # x is infinity
1:
j ra
move v0, zero # x is NOT infinity
END(isinf)
|
