[Bug middle-end/64568] [5 Regression] error: invalid reference prefix

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64568

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Index: gcc/tree-ssa-forwprop.c
===================================================================
--- gcc/tree-ssa-forwprop.c     (revision 219446)
+++ gcc/tree-ssa-forwprop.c     (working copy)
@@ -2281,7 +2281,9 @@ pass_forwprop::execute (function *fun)
              if (single_imm_use (lhs, &use_p, &use_stmt)
                  && gimple_store_p (use_stmt)
                  && !gimple_has_volatile_ops (use_stmt)
-                 && is_gimple_assign (use_stmt))
+                 && is_gimple_assign (use_stmt)
+                 && (TREE_CODE (gimple_assign_lhs (use_stmt))
+                     != TARGET_MEM_REF))
                {
                  tree use_lhs = gimple_assign_lhs (use_stmt);
                  tree new_lhs = build1 (REALPART_EXPR,

probably fixes it.