https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88598

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2019-01-02
                 CC|                            |rsandifo at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
The issue for bar() is that we do not have constant folding for

  <bb 2> [local count: 894749062]:
  vect__5.23_41 = MEM[(const float *)v_16(D)];
  vect__6.24_42 = vect__5.23_41 * { 0.0, 1.0e+0, 0.0, 0.0 };
  stmp_ret_17.26_45 = .REDUC_PLUS (vect__6.24_42); [tail call]
  return stmp_ret_17.26_45;

fold-const-call.c would be the place to amend with the various IFNs
we accumulated.

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