Inline string with using bit_cast (std:c++20)

main.cpp

#include <bit>
#include <array>

int main()
{
    // Create raw array in stack: rsp+2C
    volatile std::uint32_t stack[3];

    // mov dword ptr ss:[rsp+2C], 6C6C6548
    stack[0] = std::integral_constant<std::uint32_t, std::bit_cast<std::uint32_t>(std::array<char, sizeof(std::uint32_t)>{'H', 'e', 'l', 'l'})>::value;

    // mov dword ptr ss:[rsp+30], 6F57206F
    stack[1] = std::integral_constant<std::uint32_t, std::bit_cast<std::uint32_t>(std::array<char, sizeof(std::uint32_t)>{'o', ' ', 'W', 'o'})>::value;

    // mov dword ptr ss:[rsp+34], 646C72
    stack[2] = std::integral_constant<std::uint32_t, std::bit_cast<std::uint32_t>(std::array<char, sizeof(std::uint32_t)>{'r', 'l', 'd', '\0'})>::value;

    // lea rdx, qword ptr ss:[rsp+2C]
    std::printf("%s", (const char *)(&stack));
}

x64 disassembly

main():
    sub rsp,38
    mov dword ptr ss:[rsp+2C],6C6C6548
    mov dword ptr ss:[rsp+30],6F57206F
    mov dword ptr ss:[rsp+34],646C72
    lea rdx,qword ptr ss:[rsp+2C]
    lea rcx,qword ptr ds:[<"%s">]
    call <printf>
    xor eax,eax
    add rsp,38
    ret

Output

Hello World