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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" |
|
- | 30 | #include "conversion.h" |
|
- | 31 | ||
- | 32 | float64 convertFloat32ToFloat64(float32 a) |
|
- | 33 | { |
|
- | 34 | float64 result; |
|
- | 35 | __u64 mant; |
|
- | 36 | ||
- | 37 | result.parts.sign = a.parts.sign; |
|
- | 38 | result.parts.mantisa = a.parts.mantisa; |
|
- | 39 | result.parts.mantisa <<= (FLOAT64_MANTISA_SIZE - FLOAT32_MANTISA_SIZE ); |
|
- | 40 | ||
- | 41 | if ((isFloat32Infinity(a))||(isFloat32NaN(a))) { |
|
- | 42 | result.parts.exp = 0x7FF; |
|
- | 43 | /* TODO; check if its correct for SigNaNs*/ |
|
- | 44 | return result; |
|
- | 45 | }; |
|
- | 46 | ||
- | 47 | result.parts.exp = a.parts.exp + ( (int)FLOAT64_BIAS - FLOAT32_BIAS ); |
|
- | 48 | if (a.parts.exp == 0) { |
|
- | 49 | /* normalize denormalized numbers */ |
|
- | 50 | ||
- | 51 | if (result.parts.mantisa == 0ll) { /* fix zero */ |
|
- | 52 | result.parts.exp = 0ll; |
|
- | 53 | return result; |
|
- | 54 | } |
|
- | 55 | ||
- | 56 | mant = result.parts.mantisa; |
|
- | 57 | ||
- | 58 | while (!(mant & (0x10000000000000ll))) { |
|
- | 59 | mant <<= 1; |
|
- | 60 | --result.parts.exp; |
|
- | 61 | }; |
|
- | 62 | result.parts.mantisa = mant; |
|
- | 63 | }; |
|
- | 64 | ||
- | 65 | return result; |
|
- | 66 | ||
- | 67 | }; |
|
- | 68 | ||
- | 69 | float32 convertFloat64ToFloat32(float64 a) |
|
- | 70 | { |
|
- | 71 | float32 result; |
|
- | 72 | __s32 exp; |
|
- | 73 | __u64 mant; |
|
- | 74 | ||
- | 75 | result.parts.sign = a.parts.sign; |
|
- | 76 | ||
- | 77 | if (isFloat64NaN(a)) { |
|
- | 78 | ||
- | 79 | result.parts.exp = 0xFF; |
|
- | 80 | ||
- | 81 | if (isFloat64SigNaN(a)) { |
|
- | 82 | result.parts.mantisa = 0x800000; /* set first bit of mantisa nonzero */ |
|
- | 83 | return result; |
|
- | 84 | } |
|
- | 85 | ||
- | 86 | result.parts.mantisa = 0x1; /* mantisa nonzero but its first bit is zero */ |
|
- | 87 | return result; |
|
- | 88 | }; |
|
- | 89 | ||
- | 90 | if (isFloat64Infinity(a)) { |
|
- | 91 | result.parts.mantisa = 0; |
|
- | 92 | result.parts.exp = 0xFF; |
|
- | 93 | return result; |
|
- | 94 | }; |
|
- | 95 | ||
- | 96 | exp = (int)a.parts.exp - FLOAT64_BIAS + FLOAT32_BIAS; |
|
- | 97 | ||
- | 98 | if (exp >= 0xFF) { |
|
- | 99 | /*FIXME: overflow*/ |
|
- | 100 | result.parts.mantisa = 0; |
|
- | 101 | result.parts.exp = 0xFF; |
|
- | 102 | return result; |
|
- | 103 | ||
- | 104 | } else if (exp <= 0 ) { |
|
- | 105 | ||
- | 106 | /* underflow or denormalized */ |
|
- | 107 | ||
- | 108 | result.parts.exp = 0; |
|
- | 109 | ||
- | 110 | exp *= -1; |
|
- | 111 | ||
- | 112 | if (exp > FLOAT32_MANTISA_SIZE ) { |
|
- | 113 | /* FIXME: underflow */ |
|
- | 114 | result.parts.mantisa = 0; |
|
- | 115 | return result; |
|
- | 116 | }; |
|
- | 117 | ||
- | 118 | /* denormalized */ |
|
- | 119 | ||
- | 120 | mant = result.parts.mantisa >> 1; |
|
- | 121 | mant |= 0x10000000000000ll; /* denormalize and set hidden bit */ |
|
- | 122 | ||
- | 123 | while (exp > 0) { |
|
- | 124 | --exp; |
|
- | 125 | mant >>= 1; |
|
- | 126 | }; |
|
- | 127 | result.parts.mantisa = mant; |
|
- | 128 | ||
- | 129 | return result; |
|
- | 130 | }; |
|
- | 131 | ||
- | 132 | result.parts.exp = exp; |
|
- | 133 | result.parts.mantisa = a.parts.mantisa >> (FLOAT64_MANTISA_SIZE - FLOAT32_MANTISA_SIZE); |
|
- | 134 | return result; |
|
- | 135 | }; |
|
- | 136 | ||
29 | 137 |