https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102854
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Created attachment 51647 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51647&action=edit 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 = &a[0]; p < &a[512]; p++) for (q = 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.
