https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115936
--- Comment #5 from Tamar Christina <tnfchris at gcc dot gnu.org> --- (In reply to Richard Biener from comment #3) > iv->step should never be a pointer type This is created by SCEV. simple_iv_with_niters in the case where no CHREC is found creates an IV with base == ev, offset == 0; however in this case EV is a POINTER_PLUS_EXPR and so the type is a pointer. it ends up creating an unusable expression. following the remaining code, it looks like this should be diff --git a/gcc/tree-scalar-evolution.cc b/gcc/tree-scalar-evolution.cc index 5aa95a2497a..abb2bad7773 100644 --- a/gcc/tree-scalar-evolution.cc +++ b/gcc/tree-scalar-evolution.cc @@ -3243,7 +3243,11 @@ simple_iv_with_niters (class loop *wrto_loop, class loop *use_loop, if (tree_does_not_contain_chrecs (ev)) { iv->base = ev; - iv->step = build_int_cst (TREE_TYPE (ev), 0); + tree ev_type = TREE_TYPE (ev); + if (POINTER_TYPE_P (ev_type)) + ev_type = sizetype; + + iv->step = build_int_cst (ev_type, 0); iv->no_overflow = true; return true; } So I think there are two bugs here. I also think the IVopts one is a bug, as it's clearly changing the type and introducing a mismatch there too. I'm regression testing both changes.