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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 "conversion.h" |
30 | #include "conversion.h" |
31 | 31 | ||
32 | float64 convertFloat32ToFloat64(float32 a) |
32 | float64 convertFloat32ToFloat64(float32 a) |
33 | { |
33 | { |
34 | float64 result; |
34 | float64 result; |
35 | __u64 mant; |
35 | __u64 mant; |
36 | 36 | ||
37 | result.parts.sign = a.parts.sign; |
37 | result.parts.sign = a.parts.sign; |
38 | result.parts.mantisa = a.parts.mantisa; |
38 | result.parts.mantisa = a.parts.mantisa; |
39 | result.parts.mantisa <<= (FLOAT64_MANTISA_SIZE - FLOAT32_MANTISA_SIZE ); |
39 | result.parts.mantisa <<= (FLOAT64_MANTISA_SIZE - FLOAT32_MANTISA_SIZE ); |
40 | 40 | ||
41 | if ((isFloat32Infinity(a))||(isFloat32NaN(a))) { |
41 | if ((isFloat32Infinity(a))||(isFloat32NaN(a))) { |
42 | result.parts.exp = 0x7FF; |
42 | result.parts.exp = 0x7FF; |
43 | /* TODO; check if its correct for SigNaNs*/ |
43 | /* TODO; check if its correct for SigNaNs*/ |
44 | return result; |
44 | return result; |
45 | }; |
45 | }; |
46 | 46 | ||
47 | result.parts.exp = a.parts.exp + ( (int)FLOAT64_BIAS - FLOAT32_BIAS ); |
47 | result.parts.exp = a.parts.exp + ( (int)FLOAT64_BIAS - FLOAT32_BIAS ); |
48 | if (a.parts.exp == 0) { |
48 | if (a.parts.exp == 0) { |
49 | /* normalize denormalized numbers */ |
49 | /* normalize denormalized numbers */ |
50 | 50 | ||
51 | if (result.parts.mantisa == 0ll) { /* fix zero */ |
51 | if (result.parts.mantisa == 0ll) { /* fix zero */ |
52 | result.parts.exp = 0ll; |
52 | result.parts.exp = 0ll; |
53 | return result; |
53 | return result; |
54 | } |
54 | } |
55 | 55 | ||
56 | mant = result.parts.mantisa; |
56 | mant = result.parts.mantisa; |
57 | 57 | ||
58 | while (!(mant & (0x10000000000000ll))) { |
58 | while (!(mant & (0x10000000000000ll))) { |
59 | mant <<= 1; |
59 | mant <<= 1; |
60 | --result.parts.exp; |
60 | --result.parts.exp; |
61 | }; |
61 | }; |
- | 62 | ||
- | 63 | ++result.parts.exp; |
|
62 | result.parts.mantisa = mant; |
64 | result.parts.mantisa = mant; |
63 | }; |
65 | }; |
64 | 66 | ||
65 | return result; |
67 | return result; |
66 | 68 | ||
67 | }; |
69 | }; |
68 | 70 | ||
69 | float32 convertFloat64ToFloat32(float64 a) |
71 | float32 convertFloat64ToFloat32(float64 a) |
70 | { |
72 | { |
71 | float32 result; |
73 | float32 result; |
72 | __s32 exp; |
74 | __s32 exp; |
73 | __u64 mant; |
75 | __u64 mant; |
74 | 76 | ||
75 | result.parts.sign = a.parts.sign; |
77 | result.parts.sign = a.parts.sign; |
76 | 78 | ||
77 | if (isFloat64NaN(a)) { |
79 | if (isFloat64NaN(a)) { |
78 | 80 | ||
79 | result.parts.exp = 0xFF; |
81 | result.parts.exp = 0xFF; |
80 | 82 | ||
81 | if (isFloat64SigNaN(a)) { |
83 | if (isFloat64SigNaN(a)) { |
82 | result.parts.mantisa = 0x800000; /* set first bit of mantisa nonzero */ |
84 | result.parts.mantisa = 0x800000; /* set first bit of mantisa nonzero */ |
83 | return result; |
85 | return result; |
84 | } |
86 | } |
85 | 87 | ||
86 | result.parts.mantisa = 0x1; /* mantisa nonzero but its first bit is zero */ |
88 | result.parts.mantisa = 0x1; /* mantisa nonzero but its first bit is zero */ |
87 | return result; |
89 | return result; |
88 | }; |
90 | }; |
89 | 91 | ||
90 | if (isFloat64Infinity(a)) { |
92 | if (isFloat64Infinity(a)) { |
91 | result.parts.mantisa = 0; |
93 | result.parts.mantisa = 0; |
92 | result.parts.exp = 0xFF; |
94 | result.parts.exp = 0xFF; |
93 | return result; |
95 | return result; |
94 | }; |
96 | }; |
95 | 97 | ||
96 | exp = (int)a.parts.exp - FLOAT64_BIAS + FLOAT32_BIAS; |
98 | exp = (int)a.parts.exp - FLOAT64_BIAS + FLOAT32_BIAS; |
97 | 99 | ||
98 | if (exp >= 0xFF) { |
100 | if (exp >= 0xFF) { |
99 | /*FIXME: overflow*/ |
101 | /*FIXME: overflow*/ |
100 | result.parts.mantisa = 0; |
102 | result.parts.mantisa = 0; |
101 | result.parts.exp = 0xFF; |
103 | result.parts.exp = 0xFF; |
102 | return result; |
104 | return result; |
103 | 105 | ||
104 | } else if (exp <= 0 ) { |
106 | } else if (exp <= 0 ) { |
105 | 107 | ||
106 | /* underflow or denormalized */ |
108 | /* underflow or denormalized */ |
107 | 109 | ||
108 | result.parts.exp = 0; |
110 | result.parts.exp = 0; |
109 | 111 | ||
110 | exp *= -1; |
112 | exp *= -1; |
111 | - | ||
112 | if (exp > FLOAT32_MANTISA_SIZE ) { |
113 | if (exp > FLOAT32_MANTISA_SIZE ) { |
113 | /* FIXME: underflow */ |
114 | /* FIXME: underflow */ |
114 | result.parts.mantisa = 0; |
115 | result.parts.mantisa = 0; |
115 | return result; |
116 | return result; |
116 | }; |
117 | }; |
117 | 118 | ||
118 | /* denormalized */ |
119 | /* denormalized */ |
119 | 120 | ||
120 | mant = result.parts.mantisa >> 1; |
121 | mant = a.parts.mantisa; |
121 | mant |= 0x10000000000000ll; /* denormalize and set hidden bit */ |
122 | mant |= 0x10000000000000ll; /* denormalize and set hidden bit */ |
122 | 123 | ||
- | 124 | mant >>= (FLOAT64_MANTISA_SIZE - FLOAT32_MANTISA_SIZE + 1); |
|
- | 125 | ||
123 | while (exp > 0) { |
126 | while (exp > 0) { |
124 | --exp; |
127 | --exp; |
125 | mant >>= 1; |
128 | mant >>= 1; |
126 | }; |
129 | }; |
127 | result.parts.mantisa = mant; |
130 | result.parts.mantisa = mant; |
128 | 131 | ||
129 | return result; |
132 | return result; |
130 | }; |
133 | }; |
131 | 134 | ||
132 | result.parts.exp = exp; |
135 | result.parts.exp = exp; |
133 | result.parts.mantisa = a.parts.mantisa >> (FLOAT64_MANTISA_SIZE - FLOAT32_MANTISA_SIZE); |
136 | result.parts.mantisa = a.parts.mantisa >> (FLOAT64_MANTISA_SIZE - FLOAT32_MANTISA_SIZE); |
134 | return result; |
137 | return result; |
135 | }; |
138 | }; |
136 | 139 | ||
137 | 140 |