[Bug tree-optimization/82228] [8 Regression] 416.gamess in SPEC CPU 2006 failed to build

["rsandifo at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82228

--- Comment #1 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
I think the problem is that I put the calculation too early.  It should be
after the !STMT_VINFO_RELEVANT_P check instead.

The loop we're trying to vectorise is:

  <bb 60> [0.93%] [count: INV]:
  # ih_720 = PHI <_81(62), 1(59)>
  _1610 = (integer(kind=8)) ih_720;
  _1611 = _1610 + -1;
  pretmp_1612 = IMAGPART_EXPR <*elem1_425(D)[_1611]>;
  pretmp_1613 = REALPART_EXPR <*elem1_425(D)[_1611]>;
  sl$real_356 = reciptmp_97 * pretmp_1608;
  sl$imag_207 = reciptmp_97 * pretmp_1606;
  _286 = reciptmp_97 * pretmp_1613;
  _768 = reciptmp_97 * pretmp_1612;
  REALPART_EXPR <*sl1_426(D)[_1611]> = _286;
  IMAGPART_EXPR <*sl1_426(D)[_1611]> = _768;
  _81 = ih_720 + 1;
  if (_81 > _421)
    goto <bb 61>; [15.00%] [count: INV]
  else
    goto <bb 62>; [85.00%] [count: INV]

where sl$real_356 and sl$imag_207 are not relevant (their inputs are defined
outside the loop and the only users are outside the loop).

I'll commit a patch to do that if it survives testing.