[Bug target/89021] Implement mmintrin.h in SSE

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89021

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2019-01-24
     Ever confirmed|0                           |1

--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Richard Biener from comment #2)
> I think that to avoid surprises -mno-mmx should be the default on x86 and
> thus
> MMX code would need to explicitely supply -mmmx.  Would that work around the
> issue or would we see odd errors when using the mm intrinsics?

That sounds right.  We can even vectorize

void
foo (char* restrict r, char* restrict a){
    for (int i = 0; i < 8; i++){
        r[i] += a[i];
    }
}