https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94717
--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> The compiler is apparently not prepared for new trapping loads. Fixing...
No, just a missing check on landing pads:
index a6687cd9c98..4ab8e0250ab 100644
--- a/gcc/gimple-ssa-store-merging.c
+++ b/gcc/gimple-ssa-store-merging.c
@@ -2680,6 +2680,7 @@ imm_store_chain_info::coalesce_immediate_stores ()
p[3] = data;
using the bswap framework. */
if (info->bitpos == merged_store->start + merged_store->width
+ && info->lp_nr == merged_store->lp_nr
&& merged_store->stores.length () == 1
&& merged_store->stores[0]->ins_stmt != NULL
&& info->ins_stmt != NULL)
