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-rw-r--r--gcc-4.6/gcc/tree-ssa-sccvn.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/gcc-4.6/gcc/tree-ssa-sccvn.c b/gcc-4.6/gcc/tree-ssa-sccvn.c
index eb8896907..704a86c97 100644
--- a/gcc-4.6/gcc/tree-ssa-sccvn.c
+++ b/gcc-4.6/gcc/tree-ssa-sccvn.c
@@ -1115,6 +1115,7 @@ fully_constant_vn_reference_p (vn_reference_t ref)
== TYPE_MODE (TREE_TYPE (TREE_TYPE (arg0->op0))))
&& GET_MODE_CLASS (TYPE_MODE (op->type)) == MODE_INT
&& GET_MODE_SIZE (TYPE_MODE (op->type)) == 1
+ && tree_int_cst_sgn (op->op0) >= 0
&& compare_tree_int (op->op0, TREE_STRING_LENGTH (arg0->op0)) < 0)
return build_int_cst_type (op->type,
(TREE_STRING_POINTER (arg0->op0)