[Bug c++/68484] _mm_storel_epi64((__m128i *)x, m); does nothing if "x" is a "volatile" ptr

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68484

--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Vladimir Sedach from comment #2)
> It is not just about "long long".

It isn't about long long at all, it is about whether your code is valid. In
your latest example, you are casting an int* to a float*, that's pretty much
the definition of an aliasing violation.

The types __m128 etc are documented as allowing aliasing, but I don't think
that extends to other operands of the intrinsics.