[Bug target/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 #6 from Marc Glisse <glisse at gcc dot gnu.org> ---
clang has:

static __inline__ void __DEFAULT_FN_ATTRS
_mm_storel_epi64(__m128i *__p, __m128i __a)
{
  struct __mm_storel_epi64_struct {
    long long __u;
  } __attribute__((__packed__, __may_alias__));
  ((struct __mm_storel_epi64_struct*)__p)->__u = __a[0];
}

It doesn't prove anything, this is just a point of comparison.
(I haven't checked, but I suspect that they have an implicit may_alias on all
vector types)