CopyFunctionTests.cpp

#include "memcpy_impl.h"
#include <iostream>
#include <vector>
#include <cstring>

typedef std::vector<uint8_t> buffer_t;
buffer_t GenerateBuffer()
{
    buffer_t tmp(0xFFFF);
    for(size_t pos = 0; pos < tmp.size(); ++pos)
    {
        tmp[pos] = static_cast<uint8_t>(pos &0xFF);
    }
    return tmp;
}

bool TestBuffer( const buffer_t &dst, const buffer_t &src, size_t start)
{
    bool errors = false;
    for( size_t pos = start; pos < src.size(); ++pos)
    {
        if(src[pos] != dst[pos])
        {
            std::cout<<"compare error at pos "<< pos <<" src " << src[pos]<< " dst " <<dst[pos]<<"\n";
            errors = true;
        }
    }
    return errors;
}

template <typename FUNCTION>
void TestCopyFunction( FUNCTION fun)
{
    auto buffer = GenerateBuffer();
    for( size_t start = 0; start < 32; ++start)
    {
        buffer_t dst(buffer.size());
        fun(dst.data()+start, buffer.data()+start, buffer.size()-start);
        TestBuffer(dst, buffer, start);
    }
}


int main()
{
    TestCopyFunction<>(std::memcpy);
    TestCopyFunction<>(rep_movsb);
    TestCopyFunction<>(sse_memcpy);
    TestCopyFunction<>(avx_memcpy);
    return 0;
}