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0007 <span style="color:#7a7c7d;">* initialization</span>
0008 <span style="color:#8e44ad;">n</span>       <span style="color:#fdbc4b;font-weight:bold;">equ</span>   <span style="color:#f67400;">20</span>
0009 <span style="color:#8e44ad;">start</span>   <span style="color:#fdbc4b;font-weight:bold;">equ</span>   <span style="color:#f67400;">$40</span>
0010 <span style="color:#8e44ad;">wddr</span>    <span style="color:#fdbc4b;font-weight:bold;">equ</span>   <span style="color:#f67400;">$0</span>
0011 <span style="color:#8e44ad;">cddr</span>    <span style="color:#fdbc4b;font-weight:bold;">equ</span>   <span style="color:#f67400;">$0</span>
0012 <span style="color:#8e44ad;">input</span>   <span style="color:#fdbc4b;font-weight:bold;">equ</span>   <span style="color:#f67400;">$ffe0</span>
0013 <span style="color:#8e44ad;">output</span>  <span style="color:#fdbc4b;font-weight:bold;">equ</span>   <span style="color:#f67400;">$ffe1</span>
0014 <span style="color:#7a7c7d;">;</span>
0015         <span style="color:#fdbc4b;font-weight:bold;">org</span>   <span style="color:#27ae60;font-weight:bold;">p:</span>start
0016         <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>
0017         <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>
0018         <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>
0019         <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>
0020 <span style="color:#7a7c7d;">;</span>
0021         <span style="font-weight:bold;">opt</span>   cc
0022 <span style="color:#7a7c7d;">;       filter loop :8+(n-1) cycles</span>
0023 
0024         <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>
0025         <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>
0026         <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>
0027         <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>
0028         <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>
0029 
0030         <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>
0031 
0032 <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
0033 <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>
0034 
0035         <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>
0036         <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>
0037         <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>
0038         <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>
0039         <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>
0040         <span style="font-weight:bold;">move</span> <span style="color:#2980b9;">m0</span><span style="color:#3f8058;">,</span><span style="color:#2980b9;">m4</span>
0041         <span style="font-weight:bold;">move</span> <span style="color:#2980b9;">m0</span><span style="color:#3f8058;">,</span><span style="color:#2980b9;">m5</span>
0042         <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>
0043                            <span style="color:#7a7c7d;">;reverse carry (bit-reversed) addressing</span>
0044 
0045         <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
0046         <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>
0047         <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>
0048 
0049 <span style="color:#8e44ad;">_end_bfy</span>
0050         <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>
0051 
0052 <span style="color:#8e44ad;">end_cell</span>
0053         <span style="font-weight:bold;">rnd</span> <span style="color:#2980b9;">a</span>
0054         <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>
0055         <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>
0056         <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>
0057 
0058         <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>
0059         <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>
0060 
0061  <span style="font-weight:bold;">bad_label</span>
0062  <span style="color:#8e44ad;">good_label</span><span style="color:#3f8058;">:</span>
0063 </pre></body></html>