I have a problem with g++14.2 and previous versions.

When I compile my program with g++ -march=native -g, the binary creates a SIGSEGV only in Intel CPUs with AVX instruction set. Not in my ARM64 nor in a Core2Duo Intel.

When I compile my program with g++ -g, the binary runs normally in any platform.

When I compile my program with g++ -march=native -O3, the binary runs normally in any platform (optimized out code?).

The place where the SIGSEGV appears, it seems correct. It is just before a call to a member function from another member function.

The assembly instruction where the SIGSEGV appears is:

=> 0x00007ff6074ea2b3 <+67>:    vmovdqa %ymm0,-0x40(%rbp)

but it seems that (rbp-0x40) is not aligned to 32 bytes:

rbp            0x5fec10

Unfortunately my code crashes the clang and ask me to report a bug.

I think that this is compiler specific. But I tried to apply alignas(32) to my definitions like:

alignas(32) band_matrix<const unsigned short*, 10, 2> res2{.....}

but either that way, rbp is not aligned to 32 bytes.

I make a minification of my program, which many times works (probably when rbp is correctly aligned to 32 bytes) and many fails (no output)

#include <cstdint>
#include <iostream>

template<typename It>
struct container_view
{
    typedef typename It::reference reference;
    typedef std::remove_reference_t<reference> value_type;
    typedef const reference const_reference;

    constexpr container_view(It it, size_t s) noexcept : it(it), s(s) {}

    constexpr It begin() const noexcept { return it; }
    constexpr It end() const noexcept { return it + size(); }

    constexpr reference operator[](size_t i) noexcept { return *(it + i); }

    /// Size of container.
    constexpr size_t size() const noexcept { return s; }

private:
    It it;
    size_t s;
};


template<typename T, typename S = const size_t>
struct shifted_vector
{
    typedef std::remove_reference_t<T> vector_type;     ///< The type of vector.
    T vec;                                              ///< DenseVector of sequential non-zero elements.
    S offset;                                           ///< Offset of first non-zero element.
};


struct band_matrix_jump_iterator
{
    typedef short value_type;
    typedef short* pointer;
    typedef short& reference;

private:
    size_t b;   // matrix's bandwidth
    size_t v;   // matrix's column
    size_t e;   // matrix's column's element's index.
    pointer p;  // Pointer to current element.

public:

    constexpr band_matrix_jump_iterator(pointer p, size_t b, size_t v, size_t e) noexcept
        : b{b}, v{v}, e{e}, p{p} {}

    constexpr band_matrix_jump_iterator &operator++() noexcept { ++e; ++p; return *this; }
    constexpr band_matrix_jump_iterator &operator+=(ptrdiff_t i) noexcept { e += i; p += i; return *this; }
    constexpr band_matrix_jump_iterator operator+(ptrdiff_t i) const noexcept
        { band_matrix_jump_iterator t(*this); t += i; return t; }
    constexpr reference operator*() const noexcept { return *p; }
    constexpr bool operator==(const band_matrix_jump_iterator &it) const noexcept { return e == it.e; }
};


struct band_matrix
{
    typedef short value_type;
    typedef value_type* pointer;

    constexpr size_t columns() const noexcept { return 10; }

    size_t b;
    pointer elements;


//---------------------------------------------------------------- TYPEDEFS OF ITERATORS AND VECTORS


    typedef band_matrix_jump_iterator column_iterator;
    typedef shifted_vector<container_view<column_iterator>, const uint8_t> column_vector;



//--------------------------------------------------------------------------- CONSTRUCTORS / ASSIGNS

    constexpr band_matrix(size_t b) : b{b}, elements(new value_type[10]) {}
    constexpr ~band_matrix() noexcept { delete[] elements; }


//------------------------------------------ GET ROWS, COLUMNS, DIAGONAL AND CORRESPONDING ITERATORS


    /// Return a beginning iterator to column c i vector.
    constexpr column_iterator column_begin(size_t i) noexcept
    { return column_iterator(elements + i, 0, i, 0); }


    /// Return a vector view of column c i.
    constexpr column_vector column(size_t i) noexcept
    { return {typename column_vector::vector_type{column_begin(i), 1}, (uint8_t) i}; }
};




using namespace std;

int main()
{
    band_matrix m(0);
    for (size_t i = 0; i < 10; ++i) m.elements[i] = i;

    // checking columns
    for (size_t i = 0; i < m.columns(); ++i)
    {
        auto v = m.column(i);
        cout << (int) v.offset << ": { ";
        for (auto i : v.vec) cout << i << " ";
        cout << "}n";
    }
}

Is this a g++ bug? my code (above) bug?
Any suggestions? (of course the first suggestion is not to use -march=native)