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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/52329] Invalid MEM_REF encountered in set_mem_attributes_minus_bitpos
Date: Wed, 22 Feb 2012 09:58:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52329

--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-02-22 09:57:22 UTC ---
I'm not sure we care about preserving pointer types in debug stmts, nor if
the mem-ref stripping is needed (well, build_fold_addr_expr does that, too).

Index: gcc/gimple-fold.c
===================================================================
--- gcc/gimple-fold.c   (revision 184460)
+++ gcc/gimple-fold.c   (working copy)
@@ -1250,6 +1250,18 @@ fold_stmt_1 (gimple_stmt_iterator *gsi,
                  changed = true;
                }
            }
+         else if (val
+                  && TREE_CODE (val) == ADDR_EXPR)
+           {
+             tree ref = TREE_OPERAND (val, 0);
+             tree tem = maybe_fold_reference (ref, false);
+             if (tem)
+               {
+                 tem = build_fold_addr_expr_with_type (tem, TREE_TYPE (val));
+                 gimple_debug_bind_set_value (stmt, tem);
+                 changed = true;
+               }
+           }
        }
       break;

fixes it for me.