[Bug target/98167] [x86] Failure to optimize operation on indentically shuffled operands into a shuffle of the result of the operation

[crazylht at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98167

--- Comment #13 from Hongtao.liu <crazylht at gmail dot com> ---
fold shulfps to vec_perm_exp, but still 2 shulfps are generated.

__m128 f (__m128 a, __m128 b)
{
  vector(4) float _3;
  vector(4) float _5;
  vector(4) float _6;

;;   basic block 2, loop depth 0
;;    pred:       ENTRY
  _3 = VEC_PERM_EXPR <b_2(D), b_2(D), { 0, 0, 0, 0 }>;
  _5 = VEC_PERM_EXPR <a_4(D), a_4(D), { 0, 0, 0, 0 }>;
  _6 = _3 * _5;
  return _6;
;;    succ:       EXIT

}