https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89594
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Like
Index: gcc/tree-if-conv.c
===================================================================
--- gcc/tree-if-conv.c (revision 269385)
+++ gcc/tree-if-conv.c (working copy)
@@ -3176,6 +3176,8 @@ pass_if_conversion::execute (function *f
for (unsigned i = 0; i < preds.length (); ++i)
{
gimple *g = preds[i];
+ if (!gimple_bb (g))
+ continue;
unsigned ifcvt_loop = tree_to_uhwi (gimple_call_arg (g, 0));
if (!get_loop (fun, ifcvt_loop))
{
