copy_ve.cpp

#include <cstring>
#include <vector>

#include <ftrace.h>

const int n = 1000000;
const int offset = 1;

void do_memcpy(std::vector<char> &dst, const std::vector<char> &src)
{
    ftrace_region_begin("memcpy");
    std::memcpy(dst.data() + offset, src.data(), n - offset);
    ftrace_region_end("memcpy");
}

void do_copy_vec(std::vector<char> &dst, const std::vector<char> &src)
{
    ftrace_region_begin("copy/iterator");
    std::copy(src.begin() + offset, src.end(), dst.begin());
    ftrace_region_end("copy/iterator");
}

void do_copy_ptr(std::vector<char> &dst, const std::vector<char> &src)
{
    ftrace_region_begin("copy/pointer");
    std::copy(src.data() + offset, src.data() + n, dst.data());
    ftrace_region_end("copy/pointer");
}

int main()
{
    std::vector<char> src(n), dst(n);

    do_memcpy(dst, src);

    do_copy_vec(dst, src);

    do_copy_ptr(dst, src);

    return 0;
}