vivado hls设计总结(二十)

一、硬件高效型C语言代码之C++类和模板
1.vivado hls支持C++ class类的综合
2.vivado hls只是支持对顶层函数进行综合
3.vivado hls不支持对顶层的class类进行综合
4.如果要对类成员函数进行综合，需要将类本身例化为函数
5.不支持对位于顶层的类进行综合
6.不支持对位于顶层的类成员函数进行综合

二、顶层函数

三、类的实现

#include <fstream>
#include <iostream>
#include <iomanip>
#include <cstdlib>
using namespace std;
#define N 85
typedef int coef_t;
typedef int data_t;
typedef int acc_t;
// Class CFir definition
template<class coef_T, class data_T, class acc_T>
class CFir {
protected:
static const coef_T c[N];
data_T shift_reg[N-1];
private:
public:
data_T operator()(data_T x);
template<class coef_TT, class data_TT, class acc_TT>
friend ostream&
operator<<(ostream& o, const CFir<coef_TT, data_TT, acc_TT> &f);
};
// Load FIR coefficients
template<class coef_T, class data_T, class acc_T>
const coef_T CFir<coef_T, data_T, acc_T>::c[N] = {
#include "cpp_FIR.h"
};
// FIR main algorithm
template<class coef_T, class data_T, class acc_T>
data_T CFir<coef_T, data_T, acc_T>::operator()(data_T x) {
int i;
acc_t acc = 0;
data_t m;
loop: for (i = N-1; i >= 0; i--) {
if (i == 0) {
m = x;
shift_reg[0] = x;
} else {
m = shift_reg[i-1];
if (i != (N-1))
shift_reg[i] = shift_reg[i - 1];
}
acc += m * c[i];
}
return acc;
}
// Operator for displaying results
template<class coef_T, class data_T, class acc_T>
ostream& operator<<(ostream& o, const CFir<coef_T, data_T, acc_T> &f) {
for (int i = 0; i < (sizeof(f.shift_reg)/sizeof(data_T)); i++) {
o << shift_reg[ << i << ]= << f.shift_reg[i] << endl;
}

o << ______________ << endl;
return o;
}
data_t cpp_FIR(data_t x);

四、测试激励的编写

五、可以使用类模板来实现递归算法

//Tail recursive call
template<data_t N> struct fibon_s {
template<typename T>
static T fibon_f(T a, T b) {
return fibon_s<N-1>::fibon_f(b, (a+b));
}
};
// Termination condition
template<> struct fibon_s<1> {
template<typename T>
static T fibon_f(T a, T b) {
return b;
}
};
void cpp_template(data_t a, data_t b, data_t &dout){
dout = fibon_s<FIB_N>::fibon_f(a,b);
}