(const_binop): Don't call size_int if low < 0.

From-SVN: r13617

diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index e76d6b93caf812431e736fe505c74d335a8419d4..1b49128d1b1a7c7edbf7c8b48be9fb701aa9f905 100644 (file)
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -1212,7 +1212,7 @@ const_binop (code, arg1, arg2, notrunc)
        }
     got_it:
       if (TREE_TYPE (arg1) == sizetype && hi == 0
-         && low <= TREE_INT_CST_LOW (TYPE_MAX_VALUE (sizetype))
+         && low >= 0 && low <= TREE_INT_CST_LOW (TYPE_MAX_VALUE (sizetype))
          && ! overflow
          && ! TREE_OVERFLOW (arg1) && ! TREE_OVERFLOW (arg2))
        t = size_int (low);