*** empty log message ***

From-SVN: r761

diff --git a/gcc/stmt.c b/gcc/stmt.c
index de199028c3a6185ba882580295192cbc760c2905..7ba23ceac20dbea6fd4547aed2a4ba080aaa0028 100644 (file)
--- a/gcc/stmt.c
+++ b/gcc/stmt.c
@@ -1206,8 +1206,18 @@ expand_expr_stmt (exp)
       if (TYPE_MODE (TREE_TYPE (exp)) != BLKmode)
        copy_to_reg (last_expr_value);
       else
-       /* This case needs to be written.  */
-       abort ();
+       {
+         rtx lab = gen_label_rtx ();
+         
+         /* Compare the value with itself to reference it.  */
+         emit_cmp_insn (last_expr_value, last_expr_value, EQ,
+                        expand_expr (TYPE_SIZE (last_expr_type),
+                                     0, VOIDmode, 0),
+                        BLKmode, 0,
+                        TYPE_ALIGN (last_expr_type) / BITS_PER_UNIT);
+         emit_jump_insn ((*bcc_gen_fctn[(int) EQ]) (lab));
+         emit_label (lab);
+       }
     }
 
   /* If this expression is part of a ({...}) and is in memory, we may have
@@ -1291,6 +1301,11 @@ warn_if_unused_value (exp)
        return 0;
 
     default:
+      /* Referencing a volatile value is a side effect, so don't warn.  */
+      if ((TREE_CODE_CLASS (TREE_CODE (exp)) == 'd'
+          || TREE_CODE_CLASS (TREE_CODE (exp)) == 'r')
+         && TREE_THIS_VOLATILE (exp))
+       return 0;
       warning_with_file_and_line (emit_filename, emit_lineno,
                                  "value computed is not used");
       return 1;