`define compile error

Model Technology ModelSim ALTERA vlog 10.1d Compiler 2012.11 Nov  2 2012
-- Compiling module cordic_atan
** Error: cordic_atanp2.sv(146): near "[": syntax error, unexpected '[', expecting ')'

`define ATAN_ITER(x)     cordicatan_micro  #(                          \
                                        .wid            (wi)                    \
                                    ,   .wa             (wo)                    \
                                    ,   .ITER_SHIFT     (x)            \
                                    ,   .ITER_ATAN      (atan_``x )    \
                                )  cordicatan_iter``x  (               \
                                          .i_clk        (clk)                   \
                                    ,     .i_enable     (e[x])         \
                                    ,     .i_xold       (x[x])         \
                                    ,     .i_yold       (y[x])         \
                                    ,     .i_aold       (z[x])         \
                                    ,     .o_nxt_en     (e[x+1])       \
                                    ,     .o_xnew       (x[x+1])       \
                                    ,     .o_ynew       (y[x+1])       \
                                    ,     .o_anew       (z[x+1])       \
                                );

 

note x[x]

that 's why