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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 |