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