[Bug middle-end/79355] poor code for AVX vector compare

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79355

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-02-06
          Component|target                      |middle-end
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think expand_vector_condition doesn't consider using smaller vector sizes.

  <bb 2>:
  _3 = VEC_COND_EXPR <a_1(D) == b_2(D), { -1, -1, -1, -1, -1, -1, -1, -1 }, {
0, 0, 0, 0, 0, 0, 0, 0 }>;
  _4 = VIEW_CONVERT_EXPR<__v8su>(_3);