Comment change.

From-SVN: r4130

diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 02d4027..a7994ae 100644 (file)
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -1628,6 +1628,9 @@ non_lvalue (x)
     {
       if (TREE_CODE (x) == INTEGER_CST && integer_zerop (x))
        {
+         /* Use NOP_EXPR instead of NON_LVALUE_EXPR
+            so convert_for_assignment won't strip it.
+            This is so this 0 won't be treated as a null pointer constant.  */
          result = build1 (NOP_EXPR, TREE_TYPE (x), x);
          TREE_CONSTANT (result) = TREE_CONSTANT (x);
          return result;