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<span style="color:#898887">* initialization</span>
<span style="color:#644a9b">n</span>       <span style="font-weight:bold">equ</span>   <span style="color:#b08000">20</span>
<span style="color:#644a9b">start</span>   <span style="font-weight:bold">equ</span>   <span style="color:#b08000">$40</span>
<span style="color:#644a9b">wddr</span>    <span style="font-weight:bold">equ</span>   <span style="color:#b08000">$0</span>
<span style="color:#644a9b">cddr</span>    <span style="font-weight:bold">equ</span>   <span style="color:#b08000">$0</span>
<span style="color:#644a9b">input</span>   <span style="font-weight:bold">equ</span>   <span style="color:#b08000">$ffe0</span>
<span style="color:#644a9b">output</span>  <span style="font-weight:bold">equ</span>   <span style="color:#b08000">$ffe1</span>
<span style="color:#898887">;</span>
        <span style="font-weight:bold">org</span>   <span style="color:#006e28;font-weight:bold">p:</span>start
        <span style="font-weight:bold">move</span>  <span style="color:#aa5500">#</span><span style="color:#644a9b">wddr</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">r0</span>  <span style="color:#898887">;r0 ¬ samples</span>
        <span style="font-weight:bold">move</span>  <span style="color:#aa5500">#</span><span style="color:#644a9b">cddr</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">r4</span>  <span style="color:#898887">;r1 ¬ coefficients</span>
        <span style="font-weight:bold">move</span>  <span style="color:#aa5500">#</span><span style="color:#644a9b">n</span><span style="color:#ca60ca">-</span><span style="color:#aa5500">1</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">m0</span>   <span style="color:#898887">;set modulo arithmetic</span>
        <span style="font-weight:bold">move</span>  <span style="color:#0057ae">m0</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">m4</span>     <span style="color:#898887">;for the 2 circular buffers</span>
<span style="color:#898887">;</span>
        <span style="font-weight:bold">opt</span>   cc
<span style="color:#898887">;       filter loop :8+(n-1) cycles</span>

        <span style="font-weight:bold">movep</span> <span style="color:#006e28;font-weight:bold">y:</span>input<span style="color:#ca60ca">,</span><span style="color:#006e28;font-weight:bold">x:</span> <span style="color:#ca60ca">(</span><span style="color:#0057ae">r0</span><span style="color:#ca60ca">)</span>              <span style="color:#898887">;input sample in memory</span>
        <span style="font-weight:bold">clr</span>   <span style="color:#0057ae">a</span>                <span style="color:#006e28;font-weight:bold">x:</span><span style="color:#ca60ca">(</span><span style="color:#0057ae">r0</span><span style="color:#ca60ca">)+</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">x0</span>  <span style="color:#006e28;font-weight:bold">y:</span> <span style="color:#ca60ca">(</span><span style="color:#0057ae">r4</span><span style="color:#ca60ca">)+</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">y0</span>
        <span style="font-weight:bold">rep</span>   <span style="color:#aa5500">#</span><span style="color:#644a9b">n</span><span style="color:#ca60ca">-</span><span style="color:#aa5500">1</span>
        <span style="font-weight:bold">mac</span>   <span style="color:#0057ae">x0</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">y0</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">a</span>          <span style="color:#006e28;font-weight:bold">x:</span><span style="color:#ca60ca">(</span><span style="color:#0057ae">r0</span><span style="color:#ca60ca">)+</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">x0</span>  <span style="color:#006e28;font-weight:bold">y:</span><span style="color:#ca60ca">(</span><span style="color:#0057ae">r4</span><span style="color:#ca60ca">)+</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">y0</span>
        <span style="font-weight:bold">macr</span>  <span style="color:#0057ae">x0</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">x0</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">a</span>          <span style="color:#ca60ca">(</span><span style="color:#0057ae">r0</span><span style="color:#ca60ca">)-</span>

        <span style="font-weight:bold">movep</span> <span style="color:#0057ae">a</span><span style="color:#ca60ca">,</span><span style="color:#006e28;font-weight:bold">y:</span>output                   <span style="color:#898887">;output filtered sample</span>

<span style="color:#644a9b">fftr2a</span> <span style="font-weight:bold">macro</span> points<span style="color:#ca60ca">,</span>data<span style="color:#ca60ca">,</span>coef
<span style="color:#644a9b">fftr2a</span><span style="color:#ca60ca">:</span> <span style="font-weight:bold">ident</span> <span style="color:#b08000">1</span><span style="color:#ca60ca">,</span><span style="color:#b08000">1</span>

        <span style="font-weight:bold">move</span> <span style="color:#aa5500">#</span><span style="color:#644a9b">points</span><span style="color:#ca60ca">/</span><span style="color:#aa5500">2</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">n0</span>  <span style="color:#898887">;initialize butterflies per group</span>
        <span style="font-weight:bold">move</span> <span style="color:#aa5500">#1</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">n2</span>         <span style="color:#898887">;initialize groups per pass</span>
        <span style="font-weight:bold">move</span> <span style="color:#aa5500">#</span><span style="color:#644a9b">points</span><span style="color:#ca60ca">/</span><span style="color:#aa5500">4</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">n6</span>  <span style="color:#898887">;initialize C pointer offset</span>
        <span style="font-weight:bold">move</span> <span style="color:#aa5500">#</span><span style="color:#ca60ca">-</span><span style="color:#aa5500">1</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">m0</span>        <span style="color:#898887">;initialize A and B address modifiers</span>
        <span style="font-weight:bold">move</span> <span style="color:#0057ae">m0</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">m1</span>         <span style="color:#898887">;for linear addressing</span>
        <span style="font-weight:bold">move</span> <span style="color:#0057ae">m0</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">m4</span>
        <span style="font-weight:bold">move</span> <span style="color:#0057ae">m0</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">m5</span>
        <span style="font-weight:bold">move</span> <span style="color:#aa5500">#0</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">m6</span>         <span style="color:#898887">;initialize C address modifier for</span>
                           <span style="color:#898887">;reverse carry (bit-reversed) addressing</span>

        <span style="font-weight:bold">do</span>   <span style="color:#aa5500">#</span><span style="color:#644a9b;font-weight:bold">@cvi</span> <span style="color:#ca60ca">(</span><span style="color:#644a9b;font-weight:bold">@log</span><span style="color:#ca60ca">(</span>points<span style="color:#ca60ca">)/</span><span style="color:#644a9b;font-weight:bold">@log</span><span style="color:#ca60ca">(</span><span style="color:#b08000">2</span><span style="color:#ca60ca">)+</span><span style="color:#b08000">0.5</span><span style="color:#ca60ca">)</span><span style="color:#ca60ca">,</span>_end_pass
        <span style="font-weight:bold">move</span> <span style="color:#aa5500">#</span><span style="color:#644a9b">data</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">r0</span>       <span style="color:#898887">;initialize A input pointer</span>
        <span style="font-weight:bold">move</span> <span style="color:#0057ae">r0</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">r4</span>          <span style="color:#898887">;initialize A output pointer</span>

<span style="color:#644a9b">_end_bfy</span>
        <span style="font-weight:bold">move</span> <span style="color:#0057ae">a</span><span style="color:#ca60ca">,</span><span style="color:#006e28;font-weight:bold">x:</span><span style="color:#ca60ca">(</span><span style="color:#0057ae">r5</span><span style="color:#ca60ca">)+</span><span style="color:#0057ae">n5</span> <span style="color:#006e28;font-weight:bold">y:</span><span style="color:#ca60ca">(</span><span style="color:#0057ae">r1</span><span style="color:#ca60ca">)+</span><span style="color:#0057ae">n1</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">y1</span>

<span style="color:#644a9b">end_cell</span>
        <span style="font-weight:bold">rnd</span> <span style="color:#0057ae">a</span>
        <span style="font-weight:bold">movep</span> <span style="color:#aa5500">#0</span><span style="color:#ca60ca">,</span><span style="color:#006e28;font-weight:bold">x:</span><span style="color:#b08000">$fffe</span>
        <span style="font-weight:bold">dc</span> <span style="color:#644a9b;font-weight:bold">@sin</span><span style="color:#ca60ca">(</span><span style="color:#644a9b;font-weight:bold">@cvf</span><span style="color:#ca60ca">(</span>count<span style="color:#ca60ca">)*</span>freq<span style="color:#ca60ca">)</span>
        <span style="font-weight:bold">move</span> <span style="color:#aa5500">#</span><span style="color:#644a9b">twiddle</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">r2</span>

        <span style="font-weight:bold">MOVE</span> <span style="color:#006e28;font-weight:bold">L:</span><span style="color:#aa5500">&lt;$1</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">A</span>
        <span style="font-weight:bold">SUB</span> <span style="color:#0057ae">X</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">A</span> <span style="color:#006e28;font-weight:bold">L:</span><span style="color:#aa5500">&lt;$3</span><span style="color:#ca60ca">,</span><span style="color:#0057ae">B</span>

 <span style="font-weight:bold">bad_label</span>
 <span style="color:#644a9b">good_label</span><span style="color:#ca60ca">:</span>
</pre></body></html>