[Bug d/114171] [13/14 Regression] gdc -O2 -mavx generates misaligned vmovdqa instruction

["ibuclaw at gdcproject dot org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114171

--- Comment #4 from Iain Buclaw <ibuclaw at gdcproject dot org> ---
Removed druntime dependency.
---
import gcc.builtins;
struct Token {
    string label;
}
struct BreakStatement {
    ulong pad;
    Token label;
}

pragma(inline, false)
auto newclass()
{
    void *p = __builtin_malloc(BreakStatement.sizeof);
    __builtin_memset(p, 0, BreakStatement.sizeof);
    return cast(BreakStatement*) p;
}

int main ()
{
    auto bn = newclass();
    return bn.label is Token.init;
}
---



Roughly the equivalent C++
---
struct Token {
    struct {
    __SIZE_TYPE__ length;
    const char *ptr;
    } label;
};
struct BreakStatement {
    __UINT64_TYPE__ pad;
    Token label;
};

__attribute__((noinline))
BreakStatement *newclass()
{
    void *p = __builtin_malloc(sizeof(BreakStatement));
    __builtin_memset(p, 0, sizeof(BreakStatement));
    return (BreakStatement*) p;
}

int main ()
{
    auto bn = newclass();
    auto init = Token();
    return *(__uint128_t*)&bn->label == *(__uint128_t*)&init;
}
---