[PATCH] Fix PR52329

[Richard Guenther]

This fixes PR52329 and avoids invalid MEM_REFs to be passed to
RTL expansion.

Bootstrapped and tested on x86_64-unknown-linux-gnu, applied to trunk.

Richard.

2012-02-22  Richard Guenther  <rguent...@suse.de>

        PR middle-end/52329
        * gimple-fold.c (fold_stmt_1): Also canonicalize ADDR_EXPRs
        for GIMPLE_DEBUG stmts.

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;