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| 647 | cejka | 1 | /* |
| 2 | * Copyright (C) 2005 Josef Cejka |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | #include<sftypes.h> |
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| 30 | #include<arithmetic.h> |
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| 660 | cejka | 31 | #include<comparison.h> |
| 647 | cejka | 32 | |
| 33 | /** Add two Float32 numbers with same signs |
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| 34 | */ |
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| 35 | float32 addFloat32(float32 a, float32 b) |
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| 36 | { |
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| 37 | int expdiff; |
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| 38 | __u32 exp1,exp2,mant1,mant2; |
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| 39 | |||
| 40 | expdiff=a.parts.exp - b.parts.exp; |
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| 41 | if (expdiff<0) { |
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| 42 | if (isFloat32NaN(b)) { |
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| 43 | //TODO: fix SigNaN |
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| 44 | if (isFloat32SigNaN(b)) { |
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| 45 | }; |
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| 46 | return b; |
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| 47 | }; |
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| 48 | |||
| 49 | if (b.parts.exp==0xFF) { |
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| 50 | return b; |
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| 51 | } |
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| 52 | |||
| 53 | mant1=b.parts.mantisa; |
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| 54 | exp1=b.parts.exp; |
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| 55 | mant2=a.parts.mantisa; |
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| 56 | exp2=a.parts.exp; |
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| 57 | expdiff*=-1; |
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| 58 | } else { |
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| 59 | if (isFloat32NaN(a)) { |
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| 60 | //TODO: fix SigNaN |
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| 61 | if ((isFloat32SigNaN(a))||(isFloat32SigNaN(b))) { |
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| 62 | }; |
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| 63 | return a; |
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| 64 | }; |
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| 65 | |||
| 66 | if (a.parts.exp==0xFF) { |
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| 67 | return a; |
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| 68 | } |
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| 69 | |||
| 70 | mant1=a.parts.mantisa; |
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| 71 | exp1=a.parts.exp; |
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| 72 | mant2=b.parts.mantisa; |
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| 73 | exp2=b.parts.exp; |
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| 74 | }; |
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| 75 | |||
| 76 | if (exp1==0) { |
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| 77 | //both are denormalized |
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| 78 | mant1+=mant2; |
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| 79 | if (mant1&0xF00000) { |
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| 80 | a.parts.exp=1; |
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| 81 | }; |
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| 82 | a.parts.mantisa=mant1; |
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| 83 | return a; |
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| 84 | }; |
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| 85 | |||
| 86 | // create some space for rounding |
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| 87 | mant1<<=6; |
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| 88 | mant2<<=6; |
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| 89 | |||
| 90 | mant1|=0x20000000; //add hidden bit |
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| 91 | |||
| 92 | |||
| 93 | if (exp2==0) { |
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| 94 | --expdiff; |
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| 95 | } else { |
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| 96 | mant2|=0x20000000; //hidden bit |
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| 97 | }; |
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| 98 | |||
| 99 | if (expdiff>24) { |
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| 100 | goto done; |
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| 101 | }; |
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| 102 | |||
| 103 | mant2>>=expdiff; |
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| 104 | mant1+=mant2; |
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| 105 | done: |
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| 106 | if (mant1&0x40000000) { |
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| 107 | ++exp1; |
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| 108 | mant1>>=1; |
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| 109 | }; |
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| 110 | |||
| 111 | //rounding - if first bit after mantisa is set then round up |
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| 112 | mant1+=0x20; |
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| 113 | |||
| 114 | a.parts.exp=exp1; |
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| 115 | a.parts.mantisa=mant1>>6; |
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| 116 | return a; |
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| 117 | }; |
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| 118 | |||
| 119 | /** Substract two float32 numbers with same signs |
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| 120 | */ |
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| 121 | float32 subFloat32(float32 a, float32 b) |
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| 122 | { |
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| 123 | |||
| 124 | |||
| 125 | }; |
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| 126 |