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fixpoint: implementacion de numero de punto fijo
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1 <?xml version="1.0" encoding="UTF-8"?>
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1 /*
2 * fixpoint<T>.h
3 *
4 * Created on: Feb 24, 2015
5 * Author: aras
6 */
7
8 #ifndef FIXPOINT_H_
9 #define FIXPOINT_H_
10
11 #include <inttypes.h>
12 #include <math.h>
13 #include <typeinfo>
14 #include <cstdio>
15
16
17
18
19 template<class T>
20 class fixpoint {
21
22 private:
23 uint8_t factor;
24 T value;
25
26 public:
27 fixpoint<T>(const fixpoint<T>& fp){factor=fp.factor;value=fp.value;};
28 fixpoint<T>(uint8_t dec);
29 fixpoint<T>(uint8_t dec,T num);
30
31 void set_from_float(float num){value=T(num*(1<<factor));}
32 void set(T val){value = val;}
33 float tofloat();
34
35
36 friend inline fixpoint<T> operator-(const fixpoint<T> &num1, const fixpoint<T> &num2){
37 return fixpoint<T>(num1.factor,num1.value-num2.value);
38 }
39 friend inline fixpoint<T> operator+(const fixpoint<T> &num1, const fixpoint<T> &num2){
40 return fixpoint<T>(num1.factor,num1.value+num2.value);
41 }
42 friend inline fixpoint<T> operator*(const fixpoint<T> &num1, const fixpoint<T> &num2){
43 int64_t aux = (int64_t(num1.value)*int64_t(num2.value))>>num1.factor;
44 return fixpoint<T>(num1.factor,T(aux));
45 }
46 friend inline fixpoint<T> operator/(const fixpoint<T> &num1, const fixpoint<T> &num2){
47 int64_t aux = (int64_t(num1.value)<<num1.factor);
48 return fixpoint<T>(num1.factor,aux/num2.value);
49 }
50
51
52 //fixpoint<T>& operator= ( const fixpoint<T>& );
53
54 inline fixpoint<T> power();
55 inline fixpoint<T> sqroot();
56 };
57
58
59 //template<class T>
60 //fixpoint<T> & fixpoint<T>::operator= ( fixpoint<T> ){
61 //
62 //}
63
64
65
66
67 template<class T>
68 fixpoint<T>::fixpoint(uint8_t dec){
69 factor=dec;
70 value=0;
71 }
72
73 template<class T>
74 fixpoint<T>::fixpoint(uint8_t dec,T num){
75 factor=dec;
76 value=num;
77 }
78
79
80 template<class T>
81 float fixpoint<T>::tofloat(){
82 return float(value)/(1<<factor);
83 }
84
85 template<class T>
86 fixpoint<T> fixpoint<T>::power(){
87 int64_t aux = (int64_t(value)*int64_t(value))>>factor;
88 return fixpoint<T>(aux);
89 }
90
91 template<class T>
92 fixpoint<T> fixpoint<T>::sqroot(){
93 T aux = sqrt(value);
94 return fixpoint<T>(aux<<(factor/2));
95 }
96
97
98
99 typedef fixpoint<int32_t> num32;
100 typedef fixpoint<int64_t> num64;
101
102
103 class fix1912:public num32{
104 public:
105 fix1912():num32(12){};
106 fix1912(int32_t num):num32(12,num){};
107 };
108
109 class fix0922:public num32{
110 public:
111 fix0922():num32(22){};
112 fix0922(int32_t num):num32(22,num){};
113 };
114
115 class fix4320:public num64{
116 public:
117 fix4320():num64(20){};
118 fix4320(int64_t num):num64(20,num){};
119 };
120
121 #endif /* FIXPOINT_H_ */
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1 /*
2 * fixpoint_test.cpp
3 *
4 * Created on: Feb 24, 2015
5 * Author: aras
6 */
7
8 #include "fixpoint.h"
9
10
11 int main(){
12
13 fix1912 A;
14 fix1912 B;
15 A.set_from_float(2);
16 B.set_from_float(5);
17 fix1912 C;
18 C=A*B;
19 C.power();
20 // N44_20 A1;
21 // N44_20 B1;
22 // A1.set_from_float(2);
23 // B1.set_from_float(5);
24 //
25 // N44_20 C1 = (A1*B1).power();
26
27 printf("float valout: %f\n",-2.0*500.0);
28 printf("C valout: %f\n",C.tofloat());
29 // printf("C1 valout: %f",C1.tofloat());
30 return 0;
31 }
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