diff --git a/fft.c b/fft.c
index 3bd6b8c..321bc2e 100644
--- a/fft.c
+++ b/fft.c
@@ -80,7 +80,6 @@ int fix_fft(fixed fr[], fixed fi[], int m, int inverse)
         fi[mr] = ti;
     }
 
-
     l = 1;
     k = LOG2_N_WAVE-1;
     while(l < n)
diff --git a/fft_inst.tie b/fft_inst.tie
index e7545ab..0ca83be 100644
--- a/fft_inst.tie
+++ b/fft_inst.tie
@@ -200,6 +200,9 @@ operation FFT_calc {inout FFT_reg data, in AR wr, in AR wi, in AR shift} {}
 	wire [15:0] fii = data[31:16];
 	wire [15:0] fij = data[15:0];
 	
+	// TODO semantic for hardware implementation
+	// TODO shared functions
+	// TODO ersetzen durch TIEmac
 	wire [31:0] tr1  = TIEmul(wr, frj, 1'b1);
 	wire [15:0] tr1s = tr1[30:15];
 	wire [31:0] tr2  = TIEmul(wi, fij, 1'b1);
@@ -215,6 +218,7 @@ operation FFT_calc {inout FFT_reg data, in AR wr, in AR wi, in AR shift} {}
 	wire [15:0] qr = TIEmux(shift[0], fri, {fri[15], fri[15:1]});
 	wire [15:0] qi = TIEmux(shift[0], fii, {fii[15], fii[15:1]});
 	
+	// TODO multiple add
 	wire [15:0] frio = TIEadd(qr,  tr, 1'b0);
 	wire [15:0] frjo = TIEadd(qr, ~tr, 1'b1);
 	wire [15:0] fiio = TIEadd(qi,  ti, 1'b0);
@@ -300,7 +304,6 @@ immediate_range ld.FFT_reg_immed2 -32 24 8
 // 
 //--------------------------------------------------------------------------
 
-
 format flix64_0 64 { flix64_0_slot0, flix64_0_slot1, flix64_0_slot2 }
 
 slot_opcodes Inst {
diff --git a/main.c b/main.c
index 5d40a71..8f83db1 100644
--- a/main.c
+++ b/main.c
@@ -1,20 +1,17 @@
 //main.c
 
-
 #include        "fft.h"
 #include        "fft-org.h"
 #include        <stdio.h>
 #include        <math.h>
 
 
-#define M       8
+//defined by Compile Target
+#define M       3
 
 //number of points
 #define N       (1<<M)
 
-#define M2    100
-#define N2    (3<<M)
-
 fixed real[N], imag[N];
 fixed real_org[N], imag_org[N];
 
@@ -34,7 +31,6 @@ void show_result(fixed* real, fixed* real_org, fixed* imag, fixed* imag_org, int
 int main()
 {
     int i;
-
     for(i=0; i<N; i++)
     {
         real[i] = 1000*cos(i*2*3.1415926535/N);
@@ -50,7 +46,6 @@ int main()
         printf("%d: %d, %d\n", i, real[i], imag[i]);
     }
 
-
     //FFT
     fix_fft(real, imag, M, 0);
     fix_fft_org(real_org, imag_org, M, 0);
@@ -65,7 +60,7 @@ int main()
     printf("\nIFFT\n");
     show_result(real, real_org, imag, imag_org, N);
 
-    for(i=0; i<N; i++)
+    /*for(i=0; i<N; i++)
     {
         real[i] = 1000*(cos(i*2*3.1415926535/N) + sin(i*2*3.1415926535/N));
         real_org[i] = real[i];
@@ -73,7 +68,6 @@ int main()
         imag_org[i] = 0;
     }
 
-    /*
     //FFT
     fix_fft(real, imag, M, 0);
     fix_fft_org(real_org, imag_org, M, 0);
@@ -86,8 +80,7 @@ int main()
     fix_fft_org(real_org, imag_org, M, 1);
 
     printf("\nIFFT2\n");
-    show_result(real, real_org, imag, imag_org, N);
-    */
+    show_result(real, real_org, imag, imag_org, N);*/
 
     return 0;
 }