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<span style="color:#7a7c7d">* initialization</span>
<span style="color:#8e44ad">n</span>       <span style="color:#fdbc4b;font-weight:bold">equ</span>   <span style="color:#f67400">20</span>
<span style="color:#8e44ad">start</span>   <span style="color:#fdbc4b;font-weight:bold">equ</span>   <span style="color:#f67400">$40</span>
<span style="color:#8e44ad">wddr</span>    <span style="color:#fdbc4b;font-weight:bold">equ</span>   <span style="color:#f67400">$0</span>
<span style="color:#8e44ad">cddr</span>    <span style="color:#fdbc4b;font-weight:bold">equ</span>   <span style="color:#f67400">$0</span>
<span style="color:#8e44ad">input</span>   <span style="color:#fdbc4b;font-weight:bold">equ</span>   <span style="color:#f67400">$ffe0</span>
<span style="color:#8e44ad">output</span>  <span style="color:#fdbc4b;font-weight:bold">equ</span>   <span style="color:#f67400">$ffe1</span>
<span style="color:#7a7c7d">;</span>
        <span style="color:#fdbc4b;font-weight:bold">org</span>   <span style="color:#27ae60;font-weight:bold">p:</span>start
        <span style="font-weight:bold">move</span>  <span style="color:#27aeae;font-weight:bold">#</span><span style="color:#8e44ad">wddr</span><span style="color:#3f8058">,</span><span style="color:#2980b9">r0</span>  <span style="color:#7a7c7d">;r0 ¬ samples</span>
        <span style="font-weight:bold">move</span>  <span style="color:#27aeae;font-weight:bold">#</span><span style="color:#8e44ad">cddr</span><span style="color:#3f8058">,</span><span style="color:#2980b9">r4</span>  <span style="color:#7a7c7d">;r1 ¬ coefficients</span>
        <span style="font-weight:bold">move</span>  <span style="color:#27aeae;font-weight:bold">#</span><span style="color:#8e44ad">n</span><span style="color:#3f8058">-</span><span style="color:#27aeae;font-weight:bold">1</span><span style="color:#3f8058">,</span><span style="color:#2980b9">m0</span>   <span style="color:#7a7c7d">;set modulo arithmetic</span>
        <span style="font-weight:bold">move</span>  <span style="color:#2980b9">m0</span><span style="color:#3f8058">,</span><span style="color:#2980b9">m4</span>     <span style="color:#7a7c7d">;for the 2 circular buffers</span>
<span style="color:#7a7c7d">;</span>
        <span style="font-weight:bold">opt</span>   cc
<span style="color:#7a7c7d">;       filter loop :8+(n-1) cycles</span>

        <span style="font-weight:bold">movep</span> <span style="color:#27ae60;font-weight:bold">y:</span>input<span style="color:#3f8058">,</span><span style="color:#27ae60;font-weight:bold">x:</span> <span style="color:#3f8058">(</span><span style="color:#2980b9">r0</span><span style="color:#3f8058">)</span>              <span style="color:#7a7c7d">;input sample in memory</span>
        <span style="font-weight:bold">clr</span>   <span style="color:#2980b9">a</span>                <span style="color:#27ae60;font-weight:bold">x:</span><span style="color:#3f8058">(</span><span style="color:#2980b9">r0</span><span style="color:#3f8058">)+</span><span style="color:#3f8058">,</span><span style="color:#2980b9">x0</span>  <span style="color:#27ae60;font-weight:bold">y:</span> <span style="color:#3f8058">(</span><span style="color:#2980b9">r4</span><span style="color:#3f8058">)+</span><span style="color:#3f8058">,</span><span style="color:#2980b9">y0</span>
        <span style="font-weight:bold">rep</span>   <span style="color:#27aeae;font-weight:bold">#</span><span style="color:#8e44ad">n</span><span style="color:#3f8058">-</span><span style="color:#27aeae;font-weight:bold">1</span>
        <span style="font-weight:bold">mac</span>   <span style="color:#2980b9">x0</span><span style="color:#3f8058">,</span><span style="color:#2980b9">y0</span><span style="color:#3f8058">,</span><span style="color:#2980b9">a</span>          <span style="color:#27ae60;font-weight:bold">x:</span><span style="color:#3f8058">(</span><span style="color:#2980b9">r0</span><span style="color:#3f8058">)+</span><span style="color:#3f8058">,</span><span style="color:#2980b9">x0</span>  <span style="color:#27ae60;font-weight:bold">y:</span><span style="color:#3f8058">(</span><span style="color:#2980b9">r4</span><span style="color:#3f8058">)+</span><span style="color:#3f8058">,</span><span style="color:#2980b9">y0</span>
        <span style="font-weight:bold">macr</span>  <span style="color:#2980b9">x0</span><span style="color:#3f8058">,</span><span style="color:#2980b9">x0</span><span style="color:#3f8058">,</span><span style="color:#2980b9">a</span>          <span style="color:#3f8058">(</span><span style="color:#2980b9">r0</span><span style="color:#3f8058">)-</span>

        <span style="font-weight:bold">movep</span> <span style="color:#2980b9">a</span><span style="color:#3f8058">,</span><span style="color:#27ae60;font-weight:bold">y:</span>output                   <span style="color:#7a7c7d">;output filtered sample</span>

<span style="color:#8e44ad">fftr2a</span> <span style="color:#fdbc4b;font-weight:bold">macro</span> points<span style="color:#3f8058">,</span>data<span style="color:#3f8058">,</span>coef
<span style="color:#8e44ad">fftr2a</span><span style="color:#3f8058">:</span> <span style="font-weight:bold">ident</span> <span style="color:#f67400">1</span><span style="color:#3f8058">,</span><span style="color:#f67400">1</span>

        <span style="font-weight:bold">move</span> <span style="color:#27aeae;font-weight:bold">#</span><span style="color:#8e44ad">points</span><span style="color:#3f8058">/</span><span style="color:#27aeae;font-weight:bold">2</span><span style="color:#3f8058">,</span><span style="color:#2980b9">n0</span>  <span style="color:#7a7c7d">;initialize butterflies per group</span>
        <span style="font-weight:bold">move</span> <span style="color:#27aeae;font-weight:bold">#1</span><span style="color:#3f8058">,</span><span style="color:#2980b9">n2</span>         <span style="color:#7a7c7d">;initialize groups per pass</span>
        <span style="font-weight:bold">move</span> <span style="color:#27aeae;font-weight:bold">#</span><span style="color:#8e44ad">points</span><span style="color:#3f8058">/</span><span style="color:#27aeae;font-weight:bold">4</span><span style="color:#3f8058">,</span><span style="color:#2980b9">n6</span>  <span style="color:#7a7c7d">;initialize C pointer offset</span>
        <span style="font-weight:bold">move</span> <span style="color:#27aeae;font-weight:bold">#</span><span style="color:#3f8058">-</span><span style="color:#27aeae;font-weight:bold">1</span><span style="color:#3f8058">,</span><span style="color:#2980b9">m0</span>        <span style="color:#7a7c7d">;initialize A and B address modifiers</span>
        <span style="font-weight:bold">move</span> <span style="color:#2980b9">m0</span><span style="color:#3f8058">,</span><span style="color:#2980b9">m1</span>         <span style="color:#7a7c7d">;for linear addressing</span>
        <span style="font-weight:bold">move</span> <span style="color:#2980b9">m0</span><span style="color:#3f8058">,</span><span style="color:#2980b9">m4</span>
        <span style="font-weight:bold">move</span> <span style="color:#2980b9">m0</span><span style="color:#3f8058">,</span><span style="color:#2980b9">m5</span>
        <span style="font-weight:bold">move</span> <span style="color:#27aeae;font-weight:bold">#0</span><span style="color:#3f8058">,</span><span style="color:#2980b9">m6</span>         <span style="color:#7a7c7d">;initialize C address modifier for</span>
                           <span style="color:#7a7c7d">;reverse carry (bit-reversed) addressing</span>

        <span style="font-weight:bold">do</span>   <span style="color:#27aeae;font-weight:bold">#</span><span style="color:#8e44ad;font-weight:bold">@cvi</span> <span style="color:#3f8058">(</span><span style="color:#8e44ad;font-weight:bold">@log</span><span style="color:#3f8058">(</span>points<span style="color:#3f8058">)/</span><span style="color:#8e44ad;font-weight:bold">@log</span><span style="color:#3f8058">(</span><span style="color:#f67400">2</span><span style="color:#3f8058">)+</span><span style="color:#f67400">0.5</span><span style="color:#3f8058">)</span><span style="color:#3f8058">,</span>_end_pass
        <span style="font-weight:bold">move</span> <span style="color:#27aeae;font-weight:bold">#</span><span style="color:#8e44ad">data</span><span style="color:#3f8058">,</span><span style="color:#2980b9">r0</span>       <span style="color:#7a7c7d">;initialize A input pointer</span>
        <span style="font-weight:bold">move</span> <span style="color:#2980b9">r0</span><span style="color:#3f8058">,</span><span style="color:#2980b9">r4</span>          <span style="color:#7a7c7d">;initialize A output pointer</span>

<span style="color:#8e44ad">_end_bfy</span>
        <span style="font-weight:bold">move</span> <span style="color:#2980b9">a</span><span style="color:#3f8058">,</span><span style="color:#27ae60;font-weight:bold">x:</span><span style="color:#3f8058">(</span><span style="color:#2980b9">r5</span><span style="color:#3f8058">)+</span><span style="color:#2980b9">n5</span> <span style="color:#27ae60;font-weight:bold">y:</span><span style="color:#3f8058">(</span><span style="color:#2980b9">r1</span><span style="color:#3f8058">)+</span><span style="color:#2980b9">n1</span><span style="color:#3f8058">,</span><span style="color:#2980b9">y1</span>

<span style="color:#8e44ad">end_cell</span>
        <span style="font-weight:bold">rnd</span> <span style="color:#2980b9">a</span>
        <span style="font-weight:bold">movep</span> <span style="color:#27aeae;font-weight:bold">#0</span><span style="color:#3f8058">,</span><span style="color:#27ae60;font-weight:bold">x:</span><span style="color:#f67400">$fffe</span>
        <span style="color:#fdbc4b;font-weight:bold">dc</span> <span style="color:#8e44ad;font-weight:bold">@sin</span><span style="color:#3f8058">(</span><span style="color:#8e44ad;font-weight:bold">@cvf</span><span style="color:#3f8058">(</span>count<span style="color:#3f8058">)*</span>freq<span style="color:#3f8058">)</span>
        <span style="font-weight:bold">move</span> <span style="color:#27aeae;font-weight:bold">#</span><span style="color:#8e44ad">twiddle</span><span style="color:#3f8058">,</span><span style="color:#2980b9">r2</span>

        <span style="font-weight:bold">MOVE</span> <span style="color:#27ae60;font-weight:bold">L:</span><span style="color:#27aeae;font-weight:bold">&lt;$1</span><span style="color:#3f8058">,</span><span style="color:#2980b9">A</span>
        <span style="font-weight:bold">SUB</span> <span style="color:#2980b9">X</span><span style="color:#3f8058">,</span><span style="color:#2980b9">A</span> <span style="color:#27ae60;font-weight:bold">L:</span><span style="color:#27aeae;font-weight:bold">&lt;$3</span><span style="color:#3f8058">,</span><span style="color:#2980b9">B</span>

 <span style="font-weight:bold">bad_label</span>
 <span style="color:#8e44ad">good_label</span><span style="color:#3f8058">:</span>
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