Subversion Repositories HelenOS-historic

Rev

Rev 804 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
647 cejka 1
/*
2
 * Copyright (C) 2005 Josef Cejka
3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
29
#include<sftypes.h>
30
#include<comparison.h>
31
 
32
inline int isFloat32NaN(float32 f)
804 cejka 33
{   /* NaN : exp = 0xff and nonzero fraction */
34
    return ((f.parts.exp==0xFF)&&(f.parts.fraction));
1035 cejka 35
}
647 cejka 36
 
697 cejka 37
inline int isFloat64NaN(float64 d)
804 cejka 38
{   /* NaN : exp = 0x7ff and nonzero fraction */
39
    return ((d.parts.exp==0x7FF)&&(d.parts.fraction));
1035 cejka 40
}
697 cejka 41
 
647 cejka 42
inline int isFloat32SigNaN(float32 f)
804 cejka 43
{   /* SigNaN : exp = 0xff fraction = 0xxxxx..x (binary), where at least one x is nonzero */
44
    return ((f.parts.exp==0xFF)&&(f.parts.fraction<0x400000)&&(f.parts.fraction));
1035 cejka 45
}
647 cejka 46
 
697 cejka 47
inline int isFloat64SigNaN(float64 d)
804 cejka 48
{   /* SigNaN : exp = 0x7ff fraction = 0xxxxx..x (binary), where at least one x is nonzero */
49
    return ((d.parts.exp==0x7FF)&&(d.parts.fraction)&&(d.parts.fraction<0x8000000000000ll));
1035 cejka 50
}
697 cejka 51
 
652 cejka 52
inline int isFloat32Infinity(float32 f)
53
{
804 cejka 54
    return ((f.parts.exp==0xFF)&&(f.parts.fraction==0x0));
1035 cejka 55
}
652 cejka 56
 
697 cejka 57
inline int isFloat64Infinity(float64 d)
58
{
804 cejka 59
    return ((d.parts.exp==0x7FF)&&(d.parts.fraction==0x0));
1035 cejka 60
}
697 cejka 61
 
688 cejka 62
inline int isFloat32Zero(float32 f)
63
{
64
    return (((f.binary) & 0x7FFFFFFF) == 0);
65
}
66
 
697 cejka 67
inline int isFloat64Zero(float64 d)
68
{
69
    return (((d.binary) & 0x7FFFFFFFFFFFFFFFll) == 0);
70
}
71
 
652 cejka 72
/**
73
 * @return 1, if both floats are equal - but NaNs are not recognized
74
 */
75
inline int isFloat32eq(float32 a, float32 b)
76
{
660 cejka 77
    return ((a.binary==b.binary)||(((a.binary| b.binary)&0x7FFFFFFF)==0)); /* a equals to b or both are zeros (with any sign) */
652 cejka 78
}
79
 
80
/**
653 cejka 81
 * @return 1, if a<b - but NaNs are not recognized
652 cejka 82
 */
83
inline int isFloat32lt(float32 a, float32 b)
84
{
85
    if (((a.binary| b.binary)&0x7FFFFFFF)==0) {
660 cejka 86
        return 0; /* +- zeroes */
652 cejka 87
    };
660 cejka 88
 
89
    if ((a.parts.sign)&&(b.parts.sign)) {
90
        /*if both are negative, smaller is that with greater binary value*/
91
        return (a.binary>b.binary);
92
        };
93
 
94
    /* lets negate signs - now will be positive numbers allways bigger than negative (first bit will be set for unsigned integer comparison)*/
95
    a.parts.sign=!a.parts.sign;
96
    b.parts.sign=!b.parts.sign;
652 cejka 97
    return (a.binary<b.binary);
98
 
99
}
100
 
653 cejka 101
/**
102
 * @return 1, if a>b - but NaNs are not recognized
103
 */
104
inline int isFloat32gt(float32 a, float32 b)
105
{
106
    if (((a.binary| b.binary)&0x7FFFFFFF)==0) {
660 cejka 107
        return 0; /* zeroes are equal with any sign */
653 cejka 108
    };
660 cejka 109
 
110
    if ((a.parts.sign)&&(b.parts.sign)) {
111
        /*if both are negative, greater is that with smaller binary value*/
112
        return (a.binary<b.binary);
113
        };
114
 
115
    /* lets negate signs - now will be positive numbers allways bigger than negative (first bit will be set for unsigned integer comparison)*/
116
    a.parts.sign=!a.parts.sign;
117
    b.parts.sign=!b.parts.sign;
653 cejka 118
    return (a.binary>b.binary);
119
 
120
}
652 cejka 121
 
653 cejka 122
 
697 cejka 123