[Bug target/71185] [7 Regression] ice in gimplify_modify_expr, at gimplify.c:4873

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71185

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Index: gcc/tree-ssa-loop-prefetch.c
===================================================================
--- gcc/tree-ssa-loop-prefetch.c        (revision 236442)
+++ gcc/tree-ssa-loop-prefetch.c        (working copy)
@@ -631,6 +631,9 @@ gather_memory_references (struct loop *l
              continue;
            }

+         if (! gimple_vuse (stmt))
+           continue;
+
          lhs = gimple_assign_lhs (stmt);
          rhs = gimple_assign_rhs1 (stmt);


should fix it.