new file mode 100644
@@ -0,0 +1,25 @@
+/* { dg-do compile } */
+
+typedef struct {
+ void *child[2];
+ char otherbits;
+} critbit0_node;
+
+int allprefixed_traverse(char *top)
+{
+ if (top)
+ {
+ critbit0_node *q = (void *)top - 1;
+ int direction = 0;
+ for (;; ++direction)
+ switch (allprefixed_traverse(q->child[direction]))
+ {
+ case 1:
+ break;
+ case 0:
+ return 0;
+ default:
+ return 1;
+ }
+ }
+}
@@ -1185,6 +1185,8 @@ copy_reference_ops_from_ref (tree ref, vec<vn_reference_op_s> *result)
else
{
gcc_assert (known_ne (op.off, -1)
+ /* The constant offset can be -1. */
+ || op.opcode == MEM_REF
/* Out-of-bound indices can compute to
a known -1 offset. */
|| ((op.opcode == ARRAY_REF