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+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr">  1 </span><span class="Comment"># Comparing 'regular' length-prefixed strings.</span>
+<span id="L2" class="LineNr">  2 </span>
+<span id="L3" class="LineNr">  3 </span>== code
+<span id="L4" class="LineNr">  4 </span>
+<span id="L5" class="LineNr">  5 </span><span class="Comment"># instruction                     effective address                                                   operand     displacement    immediate</span>
+<span id="L6" class="LineNr">  6 </span><span class="Comment"># op          subop               mod             rm32          base        index         scale       r32</span>
+<span id="L7" class="LineNr">  7 </span><span class="Comment"># 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes</span>
+<span id="L8" class="LineNr">  8 </span>
+<span id="L9" class="LineNr">  9 </span><span class="Comment"># main:  (manual test if this is the last file loaded)</span>
+<span id="L10" class="LineNr"> 10 </span>  e8/call  run-tests/disp32  <span class="Comment"># 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'.</span>
+<span id="L11" class="LineNr"> 11 </span>  <span class="Comment"># exit(Num-test-failures)</span>
+<span id="L12" class="LineNr"> 12 </span>  8b/copy                         0/mod/indirect  5/rm32/.disp32           <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          3/r32/EBX   Num-test-failures/disp32          <span class="Comment"># copy *Num-test-failures to EBX</span>
+<span id="L13" class="LineNr"> 13 </span>  b8/copy-to-EAX  1/imm32
+<span id="L14" class="LineNr"> 14 </span>  cd/syscall  0x80/imm8
+<span id="L15" class="LineNr"> 15 </span>
+<span id="L16" class="LineNr"> 16 </span>string-equal:  <span class="Comment"># s : string, benchmark : string -&gt; EAX : boolean</span>
+<span id="L17" class="LineNr"> 17 </span>  <span class="Comment"># prolog</span>
+<span id="L18" class="LineNr"> 18 </span>  55/push-EBP
+<span id="L19" class="LineNr"> 19 </span>  89/copy                         3/mod/direct    5/rm32/EBP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          4/r32/ESP  <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                <span class="Comment"># copy ESP to EBP</span>
+<span id="L20" class="LineNr"> 20 </span>  <span class="Comment"># save registers</span>
+<span id="L21" class="LineNr"> 21 </span>  51/push-ECX
+<span id="L22" class="LineNr"> 22 </span>  52/push-EDX
+<span id="L23" class="LineNr"> 23 </span>  53/push-EBX
+<span id="L24" class="LineNr"> 24 </span>  56/push-ESI
+<span id="L25" class="LineNr"> 25 </span>  <span class="Comment"># pseudocode:</span>
+<span id="L26" class="LineNr"> 26 </span>  <span class="Comment">#   if s.length != b.length return false</span>
+<span id="L27" class="LineNr"> 27 </span>  <span class="Comment">#   for i = 0;  i &lt; s.length;  ++i</span>
+<span id="L28" class="LineNr"> 28 </span>  <span class="Comment">#     if s[i] != b[i] return false</span>
+<span id="L29" class="LineNr"> 29 </span>  <span class="Comment">#   return true</span>
+<span id="L30" class="LineNr"> 30 </span>  <span class="Comment"># registers:</span>
+<span id="L31" class="LineNr"> 31 </span>  <span class="Comment">#   i: ECX</span>
+<span id="L32" class="LineNr"> 32 </span>  <span class="Comment">#   s.length: EDX</span>
+<span id="L33" class="LineNr"> 33 </span>  <span class="Comment">#   b.length: EBX</span>
+<span id="L34" class="LineNr"> 34 </span>  <span class="Comment">#   b[i]: EBX</span>
+<span id="L35" class="LineNr"> 35 </span>  <span class="Comment">#   s[i]: EAX</span>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Comment">#</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Comment"># var s/EAX : (address array byte)</span>
+<span id="L38" class="LineNr"> 38 </span>  8b/copy                         1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none <span class="Delimiter"> . </span>          0/r32/EAX   8/disp8        <span class="Delimiter"> . </span>                <span class="Comment"># copy *(EBP+8) to EAX</span>
+<span id="L39" class="LineNr"> 39 </span>  <span class="Comment"># var benchmark/EBX : (address array byte)</span>
+<span id="L40" class="LineNr"> 40 </span>  8b/copy                         1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none <span class="Delimiter"> . </span>          3/r32/EBX   0xc/disp8      <span class="Delimiter"> . </span>                <span class="Comment"># copy *(EBP+12) to EBX</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Comment"># if s.length != b.length return false</span>
+<span id="L42" class="LineNr"> 42 </span>    <span class="Comment"># EDX = s.length</span>
+<span id="L43" class="LineNr"> 43 </span>  8b/copy                         0/mod/indirect  0/rm32/EAX   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          2/r32/EDX  <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                <span class="Comment"># copy *EAX to EDX</span>
+<span id="L44" class="LineNr"> 44 </span>    <span class="Comment"># compare s.length and b.length</span>
+<span id="L45" class="LineNr"> 45 </span>  39/compare                      0/mod/indirect  3/rm32/EBX   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          2/r32/EDX  <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                <span class="Comment"># compare *EBX with EDX</span>
+<span id="L46" class="LineNr"> 46 </span>  75/jump-if-not-equal  $string-equal:false/disp8
+<span id="L47" class="LineNr"> 47 </span>$string-equal:lengths:
+<span id="L48" class="LineNr"> 48 </span>  <span class="Comment"># var i/ECX : int = 0</span>
+<span id="L49" class="LineNr"> 49 </span>  b9/copy-to-ECX  0/imm32
+<span id="L50" class="LineNr"> 50 </span>  <span class="Comment"># EBX = &amp;b[i]</span>
+<span id="L51" class="LineNr"> 51 </span>  43/inc-EBX
+<span id="L52" class="LineNr"> 52 </span>  <span class="Comment"># EAX = &amp;s[i]</span>
+<span id="L53" class="LineNr"> 53 </span>  40/inc-EAX
+<span id="L54" class="LineNr"> 54 </span>$string-equal:loop:
+<span id="L55" class="LineNr"> 55 </span>  <span class="Comment"># if i &gt;= s.length return true</span>
+<span id="L56" class="LineNr"> 56 </span>  39/compare                      3/mod/direct    1/rm32/ECX   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          2/r32/EDX  <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                <span class="Comment"># compare ECX with EDX</span>
+<span id="L57" class="LineNr"> 57 </span>  7d/jump-if-greater-or-equal  $string-equal:true/disp8
+<span id="L58" class="LineNr"> 58 </span>  <span class="Comment"># if b[i] != s[i] return false</span>
+<span id="L59" class="LineNr"> 59 </span>    <span class="Comment"># ESI = s[i]</span>
+<span id="L60" class="LineNr"> 60 </span>  8b/copy                         0/mod/indirect  0/rm32/EAX   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          6/r32/ESI  <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                <span class="Comment"># copy *EAX to ESI</span>
+<span id="L61" class="LineNr"> 61 </span>    <span class="Comment"># compare b[i] with ESI</span>
+<span id="L62" class="LineNr"> 62 </span>  39/compare                      0/mod/indirect  3/rm32/EBX   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          6/r32/ESI  <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                <span class="Comment"># compare *EBX with ESI</span>
+<span id="L63" class="LineNr"> 63 </span>  75/jump-if-not-equal  $string-equal:false/disp8
+<span id="L64" class="LineNr"> 64 </span>  <span class="Comment"># ++i</span>
+<span id="L65" class="LineNr"> 65 </span>  41/inc-ECX
+<span id="L66" class="LineNr"> 66 </span>  40/inc-EAX
+<span id="L67" class="LineNr"> 67 </span>  43/inc-EBX
+<span id="L68" class="LineNr"> 68 </span>  <span class="Comment"># loop</span>
+<span id="L69" class="LineNr"> 69 </span>  eb/jump  $string-equal:loop/disp8
+<span id="L70" class="LineNr"> 70 </span>$string-equal:true:
+<span id="L71" class="LineNr"> 71 </span>  <span class="Comment"># return true</span>
+<span id="L72" class="LineNr"> 72 </span>  b8/copy-to-EAX  1/imm32
+<span id="L73" class="LineNr"> 73 </span>  eb/jump  $string-equal:end/disp8
+<span id="L74" class="LineNr"> 74 </span>$string-equal:false:
+<span id="L75" class="LineNr"> 75 </span>  <span class="Comment"># return false</span>
+<span id="L76" class="LineNr"> 76 </span>  b8/copy-to-EAX  0/imm32
+<span id="L77" class="LineNr"> 77 </span>$string-equal:end:
+<span id="L78" class="LineNr"> 78 </span>  <span class="Comment"># restore registers</span>
+<span id="L79" class="LineNr"> 79 </span>  5e/pop-to-ESI
+<span id="L80" class="LineNr"> 80 </span>  5b/pop-to-EBX
+<span id="L81" class="LineNr"> 81 </span>  5a/pop-to-EDX
+<span id="L82" class="LineNr"> 82 </span>  59/pop-to-ECX
+<span id="L83" class="LineNr"> 83 </span>  <span class="Comment"># epilog</span>
+<span id="L84" class="LineNr"> 84 </span>  89/copy                         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          5/r32/EBP  <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                <span class="Comment"># copy EBP to ESP</span>
+<span id="L85" class="LineNr"> 85 </span>  5d/pop-to-EBP
+<span id="L86" class="LineNr"> 86 </span>  c3/return
+<span id="L87" class="LineNr"> 87 </span>
+<span id="L88" class="LineNr"> 88 </span><span class="SalientComment">## tests</span>
+<span id="L89" class="LineNr"> 89 </span>
+<span id="L90" class="LineNr"> 90 </span>test-compare-empty-with-empty-string:
+<span id="L91" class="LineNr"> 91 </span>  <span class="Comment"># EAX = string-equal(&quot;&quot;, &quot;&quot;)</span>
+<span id="L92" class="LineNr"> 92 </span>    <span class="Comment"># push args</span>
+<span id="L93" class="LineNr"> 93 </span>  68/push  &quot;&quot;/imm32
+<span id="L94" class="LineNr"> 94 </span>  68/push  &quot;&quot;/imm32
+<span id="L95" class="LineNr"> 95 </span>    <span class="Comment"># call</span>
+<span id="L96" class="LineNr"> 96 </span>  e8/call  string-equal/disp32
+<span id="L97" class="LineNr"> 97 </span>    <span class="Comment"># discard args</span>
+<span id="L98" class="LineNr"> 98 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              8/imm32           <span class="Comment"># add to ESP</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Comment"># call check-ints-equal(EAX, 1, msg)</span>
+<span id="L100" class="LineNr">100 </span>    <span class="Comment"># push args</span>
+<span id="L101" class="LineNr">101 </span>  68/push  &quot;F - test-compare-empty-with-empty-string&quot;/imm32
+<span id="L102" class="LineNr">102 </span>  68/push  1/imm32/true
+<span id="L103" class="LineNr">103 </span>  50/push-EAX
+<span id="L104" class="LineNr">104 </span>    <span class="Comment"># call</span>
+<span id="L105" class="LineNr">105 </span>  e8/call  check-ints-equal/disp32
+<span id="L106" class="LineNr">106 </span>    <span class="Comment"># discard args</span>
+<span id="L107" class="LineNr">107 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              0xc/imm32         <span class="Comment"># add to ESP</span>
+<span id="L108" class="LineNr">108 </span>  c3/return
+<span id="L109" class="LineNr">109 </span>
+<span id="L110" class="LineNr">110 </span>test-compare-empty-with-non-empty-string:  <span class="Comment"># also checks length-mismatch code path</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Comment"># EAX = string-equal(&quot;&quot;, &quot;Abc&quot;)</span>
+<span id="L112" class="LineNr">112 </span>    <span class="Comment"># push args</span>
+<span id="L113" class="LineNr">113 </span>  68/push  &quot;Abc&quot;/imm32
+<span id="L114" class="LineNr">114 </span>  68/push  &quot;&quot;/imm32
+<span id="L115" class="LineNr">115 </span>    <span class="Comment"># call</span>
+<span id="L116" class="LineNr">116 </span>  e8/call  string-equal/disp32
+<span id="L117" class="LineNr">117 </span>    <span class="Comment"># discard args</span>
+<span id="L118" class="LineNr">118 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              8/imm32           <span class="Comment"># add to ESP</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Comment"># call check-ints-equal(EAX, 0, msg)</span>
+<span id="L120" class="LineNr">120 </span>    <span class="Comment"># push args</span>
+<span id="L121" class="LineNr">121 </span>  68/push  &quot;F - test-compare-empty-with-non-empty-string&quot;/imm32
+<span id="L122" class="LineNr">122 </span>  68/push  0/imm32/false
+<span id="L123" class="LineNr">123 </span>  50/push-EAX
+<span id="L124" class="LineNr">124 </span>    <span class="Comment"># call</span>
+<span id="L125" class="LineNr">125 </span>  e8/call  check-ints-equal/disp32
+<span id="L126" class="LineNr">126 </span>    <span class="Comment"># discard args</span>
+<span id="L127" class="LineNr">127 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              0xc/imm32         <span class="Comment"># add to ESP</span>
+<span id="L128" class="LineNr">128 </span>  c3/return
+<span id="L129" class="LineNr">129 </span>
+<span id="L130" class="LineNr">130 </span>test-compare-equal-strings:
+<span id="L131" class="LineNr">131 </span>  <span class="Comment"># EAX = string-equal(&quot;Abc&quot;, &quot;Abc&quot;)</span>
+<span id="L132" class="LineNr">132 </span>    <span class="Comment"># push args</span>
+<span id="L133" class="LineNr">133 </span>  68/push  &quot;Abc&quot;/imm32
+<span id="L134" class="LineNr">134 </span>  68/push  &quot;Abc&quot;/imm32
+<span id="L135" class="LineNr">135 </span>    <span class="Comment"># call</span>
+<span id="L136" class="LineNr">136 </span>  e8/call  string-equal/disp32
+<span id="L137" class="LineNr">137 </span>    <span class="Comment"># discard args</span>
+<span id="L138" class="LineNr">138 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              8/imm32           <span class="Comment"># add to ESP</span>
+<span id="L139" class="LineNr">139 </span>  <span class="Comment"># call check-ints-equal(EAX, 1, msg)</span>
+<span id="L140" class="LineNr">140 </span>    <span class="Comment"># push args</span>
+<span id="L141" class="LineNr">141 </span>  68/push  &quot;F - test-compare-equal-strings&quot;/imm32
+<span id="L142" class="LineNr">142 </span>  68/push  1/imm32/true
+<span id="L143" class="LineNr">143 </span>  50/push-EAX
+<span id="L144" class="LineNr">144 </span>    <span class="Comment"># call</span>
+<span id="L145" class="LineNr">145 </span>  e8/call  check-ints-equal/disp32
+<span id="L146" class="LineNr">146 </span>    <span class="Comment"># discard args</span>
+<span id="L147" class="LineNr">147 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              0xc/imm32         <span class="Comment"># add to ESP</span>
+<span id="L148" class="LineNr">148 </span>  c3/return
+<span id="L149" class="LineNr">149 </span>
+<span id="L150" class="LineNr">150 </span>test-compare-inequal-strings-equal-lengths:
+<span id="L151" class="LineNr">151 </span>  <span class="Comment"># EAX = string-equal(&quot;Abc&quot;, &quot;Adc&quot;)</span>
+<span id="L152" class="LineNr">152 </span>    <span class="Comment"># push args</span>
+<span id="L153" class="LineNr">153 </span>  68/push  &quot;Adc&quot;/imm32
+<span id="L154" class="LineNr">154 </span>  68/push  &quot;Abc&quot;/imm32
+<span id="L155" class="LineNr">155 </span>    <span class="Comment"># call</span>
+<span id="L156" class="LineNr">156 </span>  e8/call  string-equal/disp32
+<span id="L157" class="LineNr">157 </span>    <span class="Comment"># discard args</span>
+<span id="L158" class="LineNr">158 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              8/imm32           <span class="Comment"># add to ESP</span>
+<span id="L159" class="LineNr">159 </span>  <span class="Comment"># call check-ints-equal(EAX, 0, msg)</span>
+<span id="L160" class="LineNr">160 </span>    <span class="Comment"># push args</span>
+<span id="L161" class="LineNr">161 </span>  68/push  &quot;F - test-compare-inequal-strings-equal-lengths&quot;/imm32
+<span id="L162" class="LineNr">162 </span>  68/push  0/imm32/false
+<span id="L163" class="LineNr">163 </span>  50/push-EAX
+<span id="L164" class="LineNr">164 </span>    <span class="Comment"># call</span>
+<span id="L165" class="LineNr">165 </span>  e8/call  check-ints-equal/disp32
+<span id="L166" class="LineNr">166 </span>    <span class="Comment"># discard args</span>
+<span id="L167" class="LineNr">167 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              0xc/imm32         <span class="Comment"># add to ESP</span>
+<span id="L168" class="LineNr">168 </span>  c3/return
+<span id="L169" class="LineNr">169 </span>
+<span id="L170" class="LineNr">170 </span><span class="Comment"># vim&#0058;nowrap:textwidth=0</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->