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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/102854] [OpenMP] Bogus "initializer expression refers to
 iteration variable" when using templates
Date: Thu, 21 Oct 2021 16:42:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102854

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 51647
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D51647&action=3Dedit
gcc12-pr102854-wip.patch

WIP patch.  Clearly still more work is needed, apparently pointer iterators
in non-rectangular loops are rejected, like:
void
foo ()
{
  int a[1024];
  int *p, *q;
  #pragma omp parallel for collapse(2)
  for (p =3D &a[0]; p < &a[512]; p++)
    for (q =3D p + 64; q < p + 128; q++)
      ;
}
and enabling it result in ICEs during omp-expand.c.  Furthermore, for both
pointer and random access iterator non-rect loops, I should verify we only
allow the var-outer, var-outer + a2, a2 + var-outer and var-outer - a2 forms
and no others and test code generation.=