PHI_ARG_NONZERO (phi, e->dest_idx) = false;
}
-/* Remove the Ith argument from PHI's argument list. This routine assumes
- ordering of alternatives in the vector is not important and implements
- removal by swapping the last alternative with the alternative we want to
- delete, then shrinking the vector. */
+/* Remove the Ith argument from PHI's argument list. This routine
+ implements removal by swapping the last alternative with the
+ alternative we want to delete and then shrinking the vector, which
+ is consistent with how we remove an edge from the edge vector. */
static void
remove_phi_arg_num (tree phi, int i)