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<a href='https://github.com/akkartik/mu/blob/main/512array.mu'>https://github.com/akkartik/mu/blob/main/512array.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="muComment"># Inserting and deleting in arrays.</span>
<span id="L2" class="LineNr"> 2 </span><span class="muComment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="muComment"># The primitives here just do the work of making space and compacting.</span>
<span id="L4" class="LineNr"> 4 </span>
<span id="L5" class="LineNr"> 5 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='512array.mu.html#L5'>slide-up</a></span> _a: (addr array int), start: int, end: int, target: int <span class="Delimiter">{</span>
<span id="L6" class="LineNr"> 6 </span> <span class="PreProc">var</span> a/<span class="muRegEsi">esi</span>: (addr array int) <span class="Special"><-</span> copy _a
<span id="L7" class="LineNr"> 7 </span> <span class="PreProc">var</span> src-idx/<span class="muRegEcx">ecx</span>: int <span class="Special"><-</span> copy start
<span id="L8" class="LineNr"> 8 </span> <span class="PreProc">var</span> dest-idx/<span class="muRegEdx">edx</span>: int <span class="Special"><-</span> copy target
<span id="L9" class="LineNr"> 9 </span> <span class="muComment"># if start == target, nothing to do</span>
<span id="L10" class="LineNr"> 10 </span> <span class="Delimiter">{</span>
<span id="L11" class="LineNr"> 11 </span> compare src-idx, dest-idx
<span id="L12" class="LineNr"> 12 </span> <span class="PreProc">break-if-!=</span>
<span id="L13" class="LineNr"> 13 </span> <span class="PreProc">return</span>
<span id="L14" class="LineNr"> 14 </span> <span class="Delimiter">}</span>
<span id="L15" class="LineNr"> 15 </span> <span class="muComment"># if start < target, abort</span>
<span id="L16" class="LineNr"> 16 </span> <span class="Delimiter">{</span>
<span id="L17" class="LineNr"> 17 </span> compare src-idx, dest-idx
<span id="L18" class="LineNr"> 18 </span> <span class="PreProc">break-if-></span>
<span id="L19" class="LineNr"> 19 </span> <a href='317abort.subx.html#L5'>abort</a> <span class="Constant">"slide-up: target > start; use <a href='512array.mu.html#L35'>slide-down</a> instead"</span>
<span id="L20" class="LineNr"> 20 </span> <span class="Delimiter">}</span>
<span id="L21" class="LineNr"> 21 </span> <span class="muComment"># perform the copy</span>
<span id="L22" class="LineNr"> 22 </span> <span class="Delimiter">{</span>
<span id="L23" class="LineNr"> 23 </span> compare src-idx, end
<span id="L24" class="LineNr"> 24 </span> <span class="PreProc">break-if->=</span>
<span id="L25" class="LineNr"> 25 </span> <span class="PreProc">var</span> dest/<span class="muRegEbx">ebx</span>: (addr int) <span class="Special"><-</span> index a, dest-idx
<span id="L26" class="LineNr"> 26 </span> <span class="PreProc">var</span> src/eax: (addr int) <span class="Special"><-</span> index a, src-idx
<span id="L27" class="LineNr"> 27 </span> <span class="PreProc">var</span> val/eax: int <span class="Special"><-</span> copy *src
<span id="L28" class="LineNr"> 28 </span> copy-to *dest, val
<span id="L29" class="LineNr"> 29 </span> src-idx <span class="Special"><-</span> increment
<span id="L30" class="LineNr"> 30 </span> dest-idx <span class="Special"><-</span> increment
<span id="L31" class="LineNr"> 31 </span> <span class="PreProc">loop</span>
<span id="L32" class="LineNr"> 32 </span> <span class="Delimiter">}</span>
<span id="L33" class="LineNr"> 33 </span><span class="Delimiter">}</span>
<span id="L34" class="LineNr"> 34 </span>
<span id="L35" class="LineNr"> 35 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='512array.mu.html#L35'>slide-down</a></span> _a: (addr array int), start: int, end: int, target: int <span class="Delimiter">{</span>
<span id="L36" class="LineNr"> 36 </span> <span class="PreProc">var</span> a/<span class="muRegEsi">esi</span>: (addr array int) <span class="Special"><-</span> copy _a
<span id="L37" class="LineNr"> 37 </span> <span class="PreProc">var</span> src-idx/<span class="muRegEcx">ecx</span>: int <span class="Special"><-</span> copy end
<span id="L38" class="LineNr"> 38 </span> src-idx <span class="Special"><-</span> decrement
<span id="L39" class="LineNr"> 39 </span> <span class="PreProc">var</span> dest-idx/<span class="muRegEdx">edx</span>: int <span class="Special"><-</span> copy target
<span id="L40" class="LineNr"> 40 </span> dest-idx <span class="Special"><-</span> add end
<span id="L41" class="LineNr"> 41 </span> dest-idx <span class="Special"><-</span> subtract start
<span id="L42" class="LineNr"> 42 </span> dest-idx <span class="Special"><-</span> decrement
<span id="L43" class="LineNr"> 43 </span> <span class="muComment"># if start == target, nothing to do</span>
<span id="L44" class="LineNr"> 44 </span> <span class="Delimiter">{</span>
<span id="L45" class="LineNr"> 45 </span> compare src-idx, dest-idx
<span id="L46" class="LineNr"> 46 </span> <span class="PreProc">break-if-!=</span>
<span id="L47" class="LineNr"> 47 </span> <span class="PreProc">return</span>
<span id="L48" class="LineNr"> 48 </span> <span class="Delimiter">}</span>
<span id="L49" class="LineNr"> 49 </span> <span class="muComment"># if start > target, abort</span>
<span id="L50" class="LineNr"> 50 </span> <span class="Delimiter">{</span>
<span id="L51" class="LineNr"> 51 </span> compare src-idx, dest-idx
<span id="L52" class="LineNr"> 52 </span> <span class="PreProc">break-if-<</span>
<span id="L53" class="LineNr"> 53 </span> <a href='317abort.subx.html#L5'>abort</a> <span class="Constant">"slide-down: target < start; use <a href='512array.mu.html#L35'>slide-down</a> instead"</span>
<span id="L54" class="LineNr"> 54 </span> <span class="Delimiter">}</span>
<span id="L55" class="LineNr"> 55 </span> <span class="muComment"># perform the copy</span>
<span id="L56" class="LineNr"> 56 </span> <span class="Delimiter">{</span>
<span id="L57" class="LineNr"> 57 </span> compare src-idx, start
<span id="L58" class="LineNr"> 58 </span> <span class="PreProc">break-if-<</span>
<span id="L59" class="LineNr"> 59 </span> <span class="PreProc">var</span> dest/<span class="muRegEbx">ebx</span>: (addr int) <span class="Special"><-</span> index a, dest-idx
<span id="L60" class="LineNr"> 60 </span> <span class="PreProc">var</span> src/eax: (addr int) <span class="Special"><-</span> index a, src-idx
<span id="L61" class="LineNr"> 61 </span> <span class="PreProc">var</span> val/eax: int <span class="Special"><-</span> copy *src
<span id="L62" class="LineNr"> 62 </span> copy-to *dest, val
<span id="L63" class="LineNr"> 63 </span> src-idx <span class="Special"><-</span> decrement
<span id="L64" class="LineNr"> 64 </span> dest-idx <span class="Special"><-</span> decrement
<span id="L65" class="LineNr"> 65 </span> <span class="PreProc">loop</span>
<span id="L66" class="LineNr"> 66 </span> <span class="Delimiter">}</span>
<span id="L67" class="LineNr"> 67 </span><span class="Delimiter">}</span>
<span id="L68" class="LineNr"> 68 </span>
<span id="L69" class="LineNr"> 69 </span><span class="PreProc">fn</span> <span class="muTest"><a href='512array.mu.html#L69'>test-slide-up</a></span> <span class="Delimiter">{</span>
<span id="L70" class="LineNr"> 70 </span> <a href='512array.mu.html#L105'>check-slide-up</a> <span class="Constant">"0 1 2 3 0"</span>, <span class="Constant">1</span>/start <span class="Constant">1</span>/end, <span class="Constant">0</span>/target, <span class="Constant">"0 1 2 3 0"</span>, <span class="Constant">"F - <a href='512array.mu.html#L69'>test-slide-up</a>/empty-interval"</span>
<span id="L71" class="LineNr"> 71 </span> <a href='512array.mu.html#L105'>check-slide-up</a> <span class="Constant">"0 1 2 3 0"</span>, <span class="Constant">1</span>/start <span class="Constant">2</span>/end, <span class="Constant">0</span>/target, <span class="Constant">"1 1 2 3 0"</span>, <span class="Constant">"F - <a href='512array.mu.html#L69'>test-slide-up</a>/single-non-overlapping"</span>
<span id="L72" class="LineNr"> 72 </span> <a href='512array.mu.html#L105'>check-slide-up</a> <span class="Constant">"0 0 0 1 2 3 0"</span>, <span class="Constant">3</span>/start <span class="Constant">6</span>/end, <span class="Constant">0</span>/target, <span class="Constant">"1 2 3 1 2 3 0"</span>, <span class="Constant">"F - <a href='512array.mu.html#L69'>test-slide-up</a>/multiple-non-overlapping"</span>
<span id="L73" class="LineNr"> 73 </span> <a href='512array.mu.html#L105'>check-slide-up</a> <span class="Constant">"0 1 2 3 0"</span>, <span class="Constant">1</span>/start <span class="Constant">4</span>/end, <span class="Constant">0</span>/target, <span class="Constant">"1 2 3 3 0"</span>, <span class="Constant">"F - <a href='512array.mu.html#L69'>test-slide-up</a>/overlapping"</span>
<span id="L74" class="LineNr"> 74 </span><span class="Delimiter">}</span>
<span id="L75" class="LineNr"> 75 </span>
<span id="L76" class="LineNr"> 76 </span><span class="PreProc">fn</span> <span class="muTest"><a href='512array.mu.html#L76'>test-slide-down</a></span> <span class="Delimiter">{</span>
<span id="L77" class="LineNr"> 77 </span> <a href='512array.mu.html#L114'>check-slide-down</a> <span class="Constant">"0 1 2 3 0"</span>, <span class="Constant">1</span>/start <span class="Constant">1</span>/end, <span class="Constant">4</span>/target, <span class="Constant">"0 1 2 3 0"</span>, <span class="Constant">"F - <a href='512array.mu.html#L76'>test-slide-down</a>/empty-interval"</span>
<span id="L78" class="LineNr"> 78 </span> <a href='512array.mu.html#L114'>check-slide-down</a> <span class="Constant">"0 1 2 3 0"</span>, <span class="Constant">1</span>/start <span class="Constant">2</span>/end, <span class="Constant">4</span>/target, <span class="Constant">"0 1 2 3 1"</span>, <span class="Constant">"F - <a href='512array.mu.html#L76'>test-slide-down</a>/single-non-overlapping"</span>
<span id="L79" class="LineNr"> 79 </span> <a href='512array.mu.html#L114'>check-slide-down</a> <span class="Constant">"0 1 2 3 0 0 0"</span>, <span class="Constant">1</span>/start <span class="Constant">4</span>/end, <span class="Constant">4</span>/target, <span class="Constant">"0 1 2 3 1 2 3"</span>, <span class="Constant">"F - <a href='512array.mu.html#L76'>test-slide-down</a>/multiple-non-overlapping"</span>
<span id="L80" class="LineNr"> 80 </span> <a href='512array.mu.html#L114'>check-slide-down</a> <span class="Constant">"0 1 2 3 0"</span>, <span class="Constant">1</span>/start <span class="Constant">4</span>/end, <span class="Constant">2</span>/target, <span class="Constant">"0 1 1 2 3"</span>, <span class="Constant">"F - <a href='512array.mu.html#L76'>test-slide-down</a>/overlapping"</span>
<span id="L81" class="LineNr"> 81 </span><span class="Delimiter">}</span>
<span id="L82" class="LineNr"> 82 </span>
<span id="L83" class="LineNr"> 83 </span><span class="muComment"># Return the index that val is at.</span>
<span id="L84" class="LineNr"> 84 </span><span class="muComment"># If not found, return len-1.</span>
<span id="L85" class="LineNr"> 85 </span><span class="muComment"># That way the result is always a valid index to pass into slide-down.</span>
<span id="L86" class="LineNr"> 86 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='512array.mu.html#L86'>find-slide-down-slot-in-array</a></span> _a: (addr array int), _val: int<span class="PreProc"> -> </span>_/<span class="muRegEcx">ecx</span>: int <span class="Delimiter">{</span>
<span id="L87" class="LineNr"> 87 </span> <span class="PreProc">var</span> a/<span class="muRegEsi">esi</span>: (addr array int) <span class="Special"><-</span> copy _a
<span id="L88" class="LineNr"> 88 </span> <span class="PreProc">var</span> val/<span class="muRegEbx">ebx</span>: int <span class="Special"><-</span> copy _val
<span id="L89" class="LineNr"> 89 </span> <span class="PreProc">var</span> max/<span class="muRegEdx">edx</span>: int <span class="Special"><-</span> length a
<span id="L90" class="LineNr"> 90 </span> max <span class="Special"><-</span> decrement
<span id="L91" class="LineNr"> 91 </span> <span class="PreProc">var</span> i/<span class="muRegEcx">ecx</span>: int <span class="Special"><-</span> copy <span class="Constant">0</span>
<span id="L92" class="LineNr"> 92 </span> <span class="Delimiter">{</span>
<span id="L93" class="LineNr"> 93 </span> compare i, max
<span id="L94" class="LineNr"> 94 </span> <span class="PreProc">break-if->=</span>
<span id="L95" class="LineNr"> 95 </span> <span class="PreProc">var</span> curr/eax: (addr int) <span class="Special"><-</span> index a, i
<span id="L96" class="LineNr"> 96 </span> compare *curr, val
<span id="L97" class="LineNr"> 97 </span> <span class="PreProc">break-if-=</span>
<span id="L98" class="LineNr"> 98 </span> i <span class="Special"><-</span> increment
<span id="L99" class="LineNr"> 99 </span> <span class="PreProc">loop</span>
<span id="L100" class="LineNr">100 </span> <span class="Delimiter">}</span>
<span id="L101" class="LineNr">101 </span> <span class="PreProc">return</span> i
<span id="L102" class="LineNr">102 </span><span class="Delimiter">}</span>
<span id="L103" class="LineNr">103 </span>
<span id="L104" class="LineNr">104 </span><span class="muComment"># helpers for tests</span>
<span id="L105" class="LineNr">105 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='512array.mu.html#L105'>check-slide-up</a></span> before: (addr array byte), start: int, end: int, target: int, after: (addr array byte), msg: (addr array byte) <span class="Delimiter">{</span>
<span id="L106" class="LineNr">106 </span> <span class="PreProc">var</span> arr-h: (handle array int)
<span id="L107" class="LineNr">107 </span> <span class="PreProc">var</span> arr-ah/eax: (addr handle array int) <span class="Special"><-</span> address arr-h
<span id="L108" class="LineNr">108 </span> <a href='311decimal-int.subx.html#L623'>parse-array-of-decimal-ints</a> before, arr-ah
<span id="L109" class="LineNr">109 </span> <span class="PreProc">var</span> arr/eax: (addr array int) <span class="Special"><-</span> <a href='120allocate.subx.html#L235'>lookup</a> *arr-ah
<span id="L110" class="LineNr">110 </span> <a href='512array.mu.html#L5'>slide-up</a> arr, start, end, target
<span id="L111" class="LineNr">111 </span> <a href='301array-equal.subx.html#L382'>check-array-equal</a> arr, after, msg
<span id="L112" class="LineNr">112 </span><span class="Delimiter">}</span>
<span id="L113" class="LineNr">113 </span>
<span id="L114" class="LineNr">114 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='512array.mu.html#L114'>check-slide-down</a></span> before: (addr array byte), start: int, end: int, target: int, after: (addr array byte), msg: (addr array byte) <span class="Delimiter">{</span>
<span id="L115" class="LineNr">115 </span> <span class="PreProc">var</span> arr-h: (handle array int)
<span id="L116" class="LineNr">116 </span> <span class="PreProc">var</span> arr-ah/eax: (addr handle array int) <span class="Special"><-</span> address arr-h
<span id="L117" class="LineNr">117 </span> <a href='311decimal-int.subx.html#L623'>parse-array-of-decimal-ints</a> before, arr-ah
<span id="L118" class="LineNr">118 </span> <span class="PreProc">var</span> arr/eax: (addr array int) <span class="Special"><-</span> <a href='120allocate.subx.html#L235'>lookup</a> *arr-ah
<span id="L119" class="LineNr">119 </span> <a href='512array.mu.html#L35'>slide-down</a> arr, start, end, target
<span id="L120" class="LineNr">120 </span> <a href='301array-equal.subx.html#L382'>check-array-equal</a> arr, after, msg
<span id="L121" class="LineNr">121 </span><span class="Delimiter">}</span>
</pre>
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