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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<arithmetic.h> |
30 | #include<arithmetic.h> |
- | 31 | #include<comparison.h> |
|
31 | 32 | ||
32 | /** Add two Float32 numbers with same signs |
33 | /** Add two Float32 numbers with same signs |
33 | */ |
34 | */ |
34 | float32 addFloat32(float32 a, float32 b) |
35 | float32 addFloat32(float32 a, float32 b) |
35 | { |
36 | { |
36 | int expdiff; |
37 | int expdiff; |
37 | __u32 exp1,exp2,mant1,mant2; |
38 | __u32 exp1,exp2,mant1,mant2; |
38 | 39 | ||
39 | expdiff=a.parts.exp - b.parts.exp; |
40 | expdiff=a.parts.exp - b.parts.exp; |
40 | if (expdiff<0) { |
41 | if (expdiff<0) { |
41 | if (isFloat32NaN(b)) { |
42 | if (isFloat32NaN(b)) { |
42 | //TODO: fix SigNaN |
43 | //TODO: fix SigNaN |
43 | if (isFloat32SigNaN(b)) { |
44 | if (isFloat32SigNaN(b)) { |
44 | }; |
45 | }; |
45 | return b; |
46 | return b; |
46 | }; |
47 | }; |
47 | 48 | ||
48 | if (b.parts.exp==0xFF) { |
49 | if (b.parts.exp==0xFF) { |
49 | return b; |
50 | return b; |
50 | } |
51 | } |
51 | 52 | ||
52 | mant1=b.parts.mantisa; |
53 | mant1=b.parts.mantisa; |
53 | exp1=b.parts.exp; |
54 | exp1=b.parts.exp; |
54 | mant2=a.parts.mantisa; |
55 | mant2=a.parts.mantisa; |
55 | exp2=a.parts.exp; |
56 | exp2=a.parts.exp; |
56 | expdiff*=-1; |
57 | expdiff*=-1; |
57 | } else { |
58 | } else { |
58 | if (isFloat32NaN(a)) { |
59 | if (isFloat32NaN(a)) { |
59 | //TODO: fix SigNaN |
60 | //TODO: fix SigNaN |
60 | if ((isFloat32SigNaN(a))||(isFloat32SigNaN(b))) { |
61 | if ((isFloat32SigNaN(a))||(isFloat32SigNaN(b))) { |
61 | }; |
62 | }; |
62 | return a; |
63 | return a; |
63 | }; |
64 | }; |
64 | 65 | ||
65 | if (a.parts.exp==0xFF) { |
66 | if (a.parts.exp==0xFF) { |
66 | return a; |
67 | return a; |
67 | } |
68 | } |
68 | 69 | ||
69 | mant1=a.parts.mantisa; |
70 | mant1=a.parts.mantisa; |
70 | exp1=a.parts.exp; |
71 | exp1=a.parts.exp; |
71 | mant2=b.parts.mantisa; |
72 | mant2=b.parts.mantisa; |
72 | exp2=b.parts.exp; |
73 | exp2=b.parts.exp; |
73 | }; |
74 | }; |
74 | 75 | ||
75 | if (exp1==0) { |
76 | if (exp1==0) { |
76 | //both are denormalized |
77 | //both are denormalized |
77 | mant1+=mant2; |
78 | mant1+=mant2; |
78 | if (mant1&0xF00000) { |
79 | if (mant1&0xF00000) { |
79 | a.parts.exp=1; |
80 | a.parts.exp=1; |
80 | }; |
81 | }; |
81 | a.parts.mantisa=mant1; |
82 | a.parts.mantisa=mant1; |
82 | return a; |
83 | return a; |
83 | }; |
84 | }; |
84 | 85 | ||
85 | // create some space for rounding |
86 | // create some space for rounding |
86 | mant1<<=6; |
87 | mant1<<=6; |
87 | mant2<<=6; |
88 | mant2<<=6; |
88 | 89 | ||
89 | mant1|=0x20000000; //add hidden bit |
90 | mant1|=0x20000000; //add hidden bit |
90 | 91 | ||
91 | 92 | ||
92 | if (exp2==0) { |
93 | if (exp2==0) { |
93 | --expdiff; |
94 | --expdiff; |
94 | } else { |
95 | } else { |
95 | mant2|=0x20000000; //hidden bit |
96 | mant2|=0x20000000; //hidden bit |
96 | }; |
97 | }; |
97 | 98 | ||
98 | if (expdiff>24) { |
99 | if (expdiff>24) { |
99 | goto done; |
100 | goto done; |
100 | }; |
101 | }; |
101 | 102 | ||
102 | mant2>>=expdiff; |
103 | mant2>>=expdiff; |
103 | mant1+=mant2; |
104 | mant1+=mant2; |
104 | done: |
105 | done: |
105 | if (mant1&0x40000000) { |
106 | if (mant1&0x40000000) { |
106 | ++exp1; |
107 | ++exp1; |
107 | mant1>>=1; |
108 | mant1>>=1; |
108 | }; |
109 | }; |
109 | 110 | ||
110 | //rounding - if first bit after mantisa is set then round up |
111 | //rounding - if first bit after mantisa is set then round up |
111 | mant1+=0x20; |
112 | mant1+=0x20; |
112 | 113 | ||
113 | a.parts.exp=exp1; |
114 | a.parts.exp=exp1; |
114 | a.parts.mantisa=mant1>>6; |
115 | a.parts.mantisa=mant1>>6; |
115 | return a; |
116 | return a; |
116 | }; |
117 | }; |
117 | 118 | ||
118 | /** Substract two float32 numbers with same signs |
119 | /** Substract two float32 numbers with same signs |
119 | */ |
120 | */ |
120 | float32 subFloat32(float32 a, float32 b) |
121 | float32 subFloat32(float32 a, float32 b) |
121 | { |
122 | { |
122 | 123 | ||
123 | 124 | ||
124 | }; |
125 | }; |
125 | 126 | ||
126 | 127 |