[Bug middle-end/111125] [14 Regression] tree-ssa.exp and vect.exp failures after commit r14-3281-g99b5921bfc8f91

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111125

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2023-08-24
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
For gcc.dg/tree-ssa/slsr-11.c we vectorize the reduction to

  <bb 2> [local count: 1073741824]:
  _15 = {s_5(D), s_5(D)};
  vect_a3_11.3_16 = _15 * { 6, 4 };
  vect__3.4_17 = (vector(2) long int) vect_a3_11.3_16;
  a1_6 = s_5(D) * 2;
  _18 = VIEW_CONVERT_EXPR<vector(2) unsigned long>(vect__3.4_17);
  _19 = .REDUC_PLUS (_18);
  _20 = (unsigned long) a1_6;
  _21 = (unsigned long) c_7(D);
  _29 = _21 * 2;
  _31 = _19 + _29;
  _30 = _20 + _21;
  _27 = _30 + _31;
  _28 = (long int) _27;
  return _28;

note: Cost model analysis for part in loop 0:
  Vector cost: 9
  Scalar cost: 9

doesn't look profitable.  I think there's something off with the scalar
accounting, I'll have a look there.