[Bug middle-end/28367] accessing via union on a vector does not cause vec_extract to be used

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=28367

Marc Glisse <glisse at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |glisse at gcc dot gnu.org

--- Comment #6 from Marc Glisse <glisse at gcc dot gnu.org> ---
Created attachment 33674
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33674&action=edit
rough patch

It needs more work (seems more complicated than it should be), but at least it
managed to produce what I expected for:

#include <x86intrin.h>
union u { __v4sf v; float a[4]; };

float f(__v4sf x){
  u t;
  t.v=x;
  return t.a[2];
}