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<a href='https://github.com/akkartik/mu/blob/main/linux/105string-equal.subx'>https://github.com/akkartik/mu/blob/main/linux/105string-equal.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr">  1 </span><span class="subxComment"># Comparing 'regular' size-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 class="subxComment">#   instruction                     effective address                                                   register    displacement    immediate</span>
<span id="L5" class="LineNr">  5 </span><span class="subxS1Comment"># . op          subop               mod             rm32          base        index         scale       r32</span>
<span id="L6" class="LineNr">  6 </span><span class="subxS1Comment"># . 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="L7" class="LineNr">  7 </span>
<span id="L8" class="LineNr">  8 </span><span class="SpecialChar">Entry</span>:  <span class="subxComment"># run all tests</span>
<span id="L9" class="LineNr">  9 </span><span class="CommentedCode">#?     e8/call test-compare-equal-strings/disp32</span>
<span id="L10" class="LineNr"> 10 </span>    e8/call  run-tests/disp32  <span class="subxComment"># '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="subxComment"># syscall(exit, Num-test-failures)</span>
<span id="L12" class="LineNr"> 12 </span>    8b/copy                         0/mod/indirect  5/rm32/.disp32           <span class="Normal"> . </span>           <span class="Normal"> . </span>          3/r32/ebx   <span class="SpecialChar"><a href='102test.subx.html#L89'>Num-test-failures</a></span>/disp32          <span class="subxComment"># copy *Num-test-failures to ebx</span>
<span id="L13" class="LineNr"> 13 </span>    e8/call  <a href='000init.subx.html#L18'>syscall_exit</a>/disp32
<span id="L14" class="LineNr"> 14 </span>
<span id="L15" class="LineNr"> 15 </span><span class="subxFunction">string-equal?</span>:  <span class="subxComment"># s: (addr array byte), benchmark: (addr array byte) -&gt; result/eax: boolean</span>
<span id="L16" class="LineNr"> 16 </span>    <span class="subxComment"># pseudocode:</span>
<span id="L17" class="LineNr"> 17 </span>    <span class="subxComment">#   if (s-&gt;size != benchmark-&gt;size) return false</span>
<span id="L18" class="LineNr"> 18 </span>    <span class="subxComment">#   return string-starts-with?(s, benchmark)</span>
<span id="L19" class="LineNr"> 19 </span>    <span class="subxComment">#</span>
<span id="L20" class="LineNr"> 20 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L21" class="LineNr"> 21 </span>    55/push-ebp
<span id="L22" class="LineNr"> 22 </span>    89/copy                         3/mod/direct    5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          4/r32/esp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy esp to ebp</span>
<span id="L23" class="LineNr"> 23 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L24" class="LineNr"> 24 </span>    51/push-ecx
<span id="L25" class="LineNr"> 25 </span>    56/push-esi
<span id="L26" class="LineNr"> 26 </span>    57/push-edi
<span id="L27" class="LineNr"> 27 </span>    <span class="subxComment"># esi = s</span>
<span id="L28" class="LineNr"> 28 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          6/r32/esi   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+8) to esi</span>
<span id="L29" class="LineNr"> 29 </span>    <span class="subxComment"># edi = benchmark</span>
<span id="L30" class="LineNr"> 30 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          7/r32/edi   0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+12) to edi</span>
<span id="L31" class="LineNr"> 31 </span>    <span class="subxComment"># ecx = s-&gt;size</span>
<span id="L32" class="LineNr"> 32 </span>    8b/copy                         0/mod/indirect  6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy *esi to ecx</span>
<span id="L33" class="LineNr"> 33 </span><span class="Constant">$string-equal?:sizes</span>:
<span id="L34" class="LineNr"> 34 </span>    <span class="subxComment"># if (ecx != benchmark-&gt;size) return false</span>
<span id="L35" class="LineNr"> 35 </span>    39/compare                      0/mod/indirect  7/rm32/edi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># compare *edi and ecx</span>
<span id="L36" class="LineNr"> 36 </span>    b8/copy-to-eax  0/imm32/false
<span id="L37" class="LineNr"> 37 </span>    75/jump-if-!=  $string-equal?:end/disp8
<span id="L38" class="LineNr"> 38 </span><span class="Constant">$string-equal?:contents</span>:
<span id="L39" class="LineNr"> 39 </span>    <span class="subxComment"># string-starts-with?(s, benchmark)</span>
<span id="L40" class="LineNr"> 40 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L41" class="LineNr"> 41 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+12)</span>
<span id="L42" class="LineNr"> 42 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+8)</span>
<span id="L43" class="LineNr"> 43 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L44" class="LineNr"> 44 </span>    e8/call  <a href='105string-equal.subx.html#L57'>string-starts-with?</a>/disp32
<span id="L45" class="LineNr"> 45 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L46" class="LineNr"> 46 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              8/imm32           <span class="subxComment"># add to esp</span>
<span id="L47" class="LineNr"> 47 </span><span class="Constant">$string-equal?:end</span>:
<span id="L48" class="LineNr"> 48 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L49" class="LineNr"> 49 </span>    5f/pop-to-edi
<span id="L50" class="LineNr"> 50 </span>    5e/pop-to-esi
<span id="L51" class="LineNr"> 51 </span>    59/pop-to-ecx
<span id="L52" class="LineNr"> 52 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L53" class="LineNr"> 53 </span>    89/copy                         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          5/r32/ebp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy ebp to esp</span>
<span id="L54" class="LineNr"> 54 </span>    5d/pop-to-ebp
<span id="L55" class="LineNr"> 55 </span>    c3/return
<span id="L56" class="LineNr"> 56 </span>
<span id="L57" class="LineNr"> 57 </span><span class="subxFunction">string-starts-with?</span>:  <span class="subxComment"># s: (addr array byte), benchmark: (addr array byte) -&gt; result/eax: boolean</span>
<span id="L58" class="LineNr"> 58 </span>    <span class="subxComment"># pseudocode:</span>
<span id="L59" class="LineNr"> 59 </span>    <span class="subxComment">#   if (s-&gt;size &lt; benchmark-&gt;size) return false</span>
<span id="L60" class="LineNr"> 60 </span>    <span class="subxComment">#   currs = s-&gt;data</span>
<span id="L61" class="LineNr"> 61 </span>    <span class="subxComment">#   currb = benchmark-&gt;data</span>
<span id="L62" class="LineNr"> 62 </span>    <span class="subxComment">#   maxb = &amp;benchmark-&gt;data[benchmark-&gt;size]</span>
<span id="L63" class="LineNr"> 63 </span>    <span class="subxComment">#   while currb &lt; maxb</span>
<span id="L64" class="LineNr"> 64 </span>    <span class="subxComment">#     c1 = *currs</span>
<span id="L65" class="LineNr"> 65 </span>    <span class="subxComment">#     c2 = *currb</span>
<span id="L66" class="LineNr"> 66 </span>    <span class="subxComment">#     if (c1 != c2) return false</span>
<span id="L67" class="LineNr"> 67 </span>    <span class="subxComment">#     ++currs, ++currb</span>
<span id="L68" class="LineNr"> 68 </span>    <span class="subxComment">#   return true</span>
<span id="L69" class="LineNr"> 69 </span>    <span class="subxComment">#</span>
<span id="L70" class="LineNr"> 70 </span>    <span class="subxComment"># registers:</span>
<span id="L71" class="LineNr"> 71 </span>    <span class="subxComment">#   currs: esi</span>
<span id="L72" class="LineNr"> 72 </span>    <span class="subxComment">#   maxs: ecx</span>
<span id="L73" class="LineNr"> 73 </span>    <span class="subxComment">#   currb: edi</span>
<span id="L74" class="LineNr"> 74 </span>    <span class="subxComment">#   c1: eax</span>
<span id="L75" class="LineNr"> 75 </span>    <span class="subxComment">#   c2: ebx</span>
<span id="L76" class="LineNr"> 76 </span>    <span class="subxComment">#</span>
<span id="L77" class="LineNr"> 77 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L78" class="LineNr"> 78 </span>    55/push-ebp
<span id="L79" class="LineNr"> 79 </span>    89/copy                         3/mod/direct    5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          4/r32/esp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy esp to ebp</span>
<span id="L80" class="LineNr"> 80 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L81" class="LineNr"> 81 </span>    51/push-ecx
<span id="L82" class="LineNr"> 82 </span>    52/push-edx
<span id="L83" class="LineNr"> 83 </span>    56/push-esi
<span id="L84" class="LineNr"> 84 </span>    57/push-edi
<span id="L85" class="LineNr"> 85 </span>    <span class="subxComment"># esi = s</span>
<span id="L86" class="LineNr"> 86 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          6/r32/esi   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+8) to esi</span>
<span id="L87" class="LineNr"> 87 </span>    <span class="subxComment"># edi = benchmark</span>
<span id="L88" class="LineNr"> 88 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          7/r32/edi   0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+12) to edi</span>
<span id="L89" class="LineNr"> 89 </span>    <span class="subxComment"># var bsize/ecx: int = benchmark-&gt;size</span>
<span id="L90" class="LineNr"> 90 </span>    8b/copy                         0/mod/indirect  7/rm32/edi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy *edi to ecx</span>
<span id="L91" class="LineNr"> 91 </span><span class="Constant">$string-starts-with?:sizes</span>:
<span id="L92" class="LineNr"> 92 </span>    <span class="subxComment"># if (s-&gt;size &lt; bsize) return false</span>
<span id="L93" class="LineNr"> 93 </span>    39/compare                      0/mod/indirect  6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># compare *esi with ecx</span>
<span id="L94" class="LineNr"> 94 </span>    7c/jump-if-&lt;  $string-starts-with?:false/disp8
<span id="L95" class="LineNr"> 95 </span>    <span class="subxComment"># var currs/esi: (addr byte) = s-&gt;data</span>
<span id="L96" class="LineNr"> 96 </span>    81          0/subop/add         3/mod/direct    6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              4/imm32           <span class="subxComment"># add to esi</span>
<span id="L97" class="LineNr"> 97 </span>    <span class="subxComment"># var currb/edi: (addr byte) = benchmark-&gt;data</span>
<span id="L98" class="LineNr"> 98 </span>    81          0/subop/add         3/mod/direct    7/rm32/edi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              4/imm32           <span class="subxComment"># add to edi</span>
<span id="L99" class="LineNr"> 99 </span>    <span class="subxComment"># var maxb/ecx: (addr byte) = &amp;benchmark-&gt;data[benchmark-&gt;size]</span>
<span id="L100" class="LineNr">100 </span>    01/add                          3/mod/direct    1/rm32/ecx   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          7/r32/edi  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># add edi to ecx</span>
<span id="L101" class="LineNr">101 </span>    <span class="subxComment"># var c1/eax: byte = 0</span>
<span id="L102" class="LineNr">102 </span>    31/xor                          3/mod/direct    0/rm32/eax   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          0/r32/eax  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># clear eax</span>
<span id="L103" class="LineNr">103 </span>    <span class="subxComment"># var c2/edx: byte = 0</span>
<span id="L104" class="LineNr">104 </span>    31/xor                          3/mod/direct    2/rm32/edx   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          2/r32/edx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># clear edx</span>
<span id="L105" class="LineNr">105 </span><span class="Constant">$string-starts-with?:loop</span>:
<span id="L106" class="LineNr">106 </span>    <span class="subxComment"># if (currs &gt;= maxs) return true</span>
<span id="L107" class="LineNr">107 </span>    39/compare                      3/mod/direct    7/rm32/edi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># compare edi with ecx</span>
<span id="L108" class="LineNr">108 </span>    73/jump-if-addr&gt;=  $string-starts-with?:true/disp8
<span id="L109" class="LineNr">109 </span>    <span class="subxComment"># c1 = *currs</span>
<span id="L110" class="LineNr">110 </span>    8a/copy-byte                    0/mod/indirect  6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          0/r32/AL   <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy byte at *esi to AL</span>
<span id="L111" class="LineNr">111 </span>    <span class="subxComment"># c2 = *currb</span>
<span id="L112" class="LineNr">112 </span>    8a/copy-byte                    0/mod/indirect  7/rm32/edi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          2/r32/DL   <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy byte at *edi to DL</span>
<span id="L113" class="LineNr">113 </span>    <span class="subxComment"># if (c1 != c2) return false</span>
<span id="L114" class="LineNr">114 </span>    39/compare                      3/mod/direct    0/rm32/eax   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          2/r32/edx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># compare eax and edx</span>
<span id="L115" class="LineNr">115 </span>    75/jump-if-!=  $string-starts-with?:false/disp8
<span id="L116" class="LineNr">116 </span>    <span class="subxComment"># ++currs</span>
<span id="L117" class="LineNr">117 </span>    46/increment-esi
<span id="L118" class="LineNr">118 </span>    <span class="subxComment"># ++currb</span>
<span id="L119" class="LineNr">119 </span>    47/increment-edi
<span id="L120" class="LineNr">120 </span>    eb/jump  $string-starts-with?:<span class="Constant">loop</span>/disp8
<span id="L121" class="LineNr">121 </span><span class="Constant">$string-starts-with?:true</span>:
<span id="L122" class="LineNr">122 </span>    b8/copy-to-eax  1/imm32
<span id="L123" class="LineNr">123 </span>    eb/jump  $string-starts-with?:end/disp8
<span id="L124" class="LineNr">124 </span><span class="Constant">$string-starts-with?:false</span>:
<span id="L125" class="LineNr">125 </span>    b8/copy-to-eax  0/imm32
<span id="L126" class="LineNr">126 </span><span class="Constant">$string-starts-with?:end</span>:
<span id="L127" class="LineNr">127 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L128" class="LineNr">128 </span>    5f/pop-to-edi
<span id="L129" class="LineNr">129 </span>    5e/pop-to-esi
<span id="L130" class="LineNr">130 </span>    5a/pop-to-edx
<span id="L131" class="LineNr">131 </span>    59/pop-to-ecx
<span id="L132" class="LineNr">132 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L133" class="LineNr">133 </span>    89/copy                         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          5/r32/ebp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy ebp to esp</span>
<span id="L134" class="LineNr">134 </span>    5d/pop-to-ebp
<span id="L135" class="LineNr">135 </span>    c3/return
<span id="L136" class="LineNr">136 </span>
<span id="L137" class="LineNr">137 </span><span class="subxH1Comment"># - tests</span>
<span id="L138" class="LineNr">138 </span>
<span id="L139" class="LineNr">139 </span><span class="subxTest">test-compare-empty-with-empty-string</span>:
<span id="L140" class="LineNr">140 </span>    <span class="subxComment"># eax = string-equal?(&quot;&quot;, &quot;&quot;)</span>
<span id="L141" class="LineNr">141 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L142" class="LineNr">142 </span>    68/push  <span class="Constant">&quot;&quot;</span>/imm32
<span id="L143" class="LineNr">143 </span>    68/push  <span class="Constant">&quot;&quot;</span>/imm32
<span id="L144" class="LineNr">144 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L145" class="LineNr">145 </span>    e8/call  <a href='105string-equal.subx.html#L15'>string-equal?</a>/disp32
<span id="L146" class="LineNr">146 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L147" class="LineNr">147 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              8/imm32           <span class="subxComment"># add to esp</span>
<span id="L148" class="LineNr">148 </span>    <span class="subxComment"># check-ints-equal(eax, 1, msg)</span>
<span id="L149" class="LineNr">149 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L150" class="LineNr">150 </span>    68/push  <span class="Constant">&quot;F - test-compare-empty-with-empty-string&quot;</span>/imm32
<span id="L151" class="LineNr">151 </span>    68/push  1/imm32/true
<span id="L152" class="LineNr">152 </span>    50/push-eax
<span id="L153" class="LineNr">153 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L154" class="LineNr">154 </span>    e8/call  <a href='102test.subx.html#L23'>check-ints-equal</a>/disp32
<span id="L155" class="LineNr">155 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L156" class="LineNr">156 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              0xc/imm32         <span class="subxComment"># add to esp</span>
<span id="L157" class="LineNr">157 </span>    c3/return
<span id="L158" class="LineNr">158 </span>
<span id="L159" class="LineNr">159 </span><span class="subxTest">test-compare-empty-with-non-empty-string</span>:  <span class="subxComment"># also checks size-mismatch code path</span>
<span id="L160" class="LineNr">160 </span>    <span class="subxComment"># eax = string-equal?(&quot;&quot;, &quot;Abc&quot;)</span>
<span id="L161" class="LineNr">161 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L162" class="LineNr">162 </span>    68/push  <span class="Constant">&quot;Abc&quot;</span>/imm32
<span id="L163" class="LineNr">163 </span>    68/push  <span class="Constant">&quot;&quot;</span>/imm32
<span id="L164" class="LineNr">164 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L165" class="LineNr">165 </span>    e8/call  <a href='105string-equal.subx.html#L15'>string-equal?</a>/disp32
<span id="L166" class="LineNr">166 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L167" class="LineNr">167 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              8/imm32           <span class="subxComment"># add to esp</span>
<span id="L168" class="LineNr">168 </span>    <span class="subxComment"># check-ints-equal(eax, 0, msg)</span>
<span id="L169" class="LineNr">169 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L170" class="LineNr">170 </span>    68/push  <span class="Constant">&quot;F - test-compare-empty-with-non-empty-string&quot;</span>/imm32
<span id="L171" class="LineNr">171 </span>    68/push  0/imm32/false
<span id="L172" class="LineNr">172 </span>    50/push-eax
<span id="L173" class="LineNr">173 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L174" class="LineNr">174 </span>    e8/call  <a href='102test.subx.html#L23'>check-ints-equal</a>/disp32
<span id="L175" class="LineNr">175 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L176" class="LineNr">176 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              0xc/imm32         <span class="subxComment"># add to esp</span>
<span id="L177" class="LineNr">177 </span>    c3/return
<span id="L178" class="LineNr">178 </span>
<span id="L179" class="LineNr">179 </span><span class="subxTest">test-compare-equal-strings</span>:
<span id="L180" class="LineNr">180 </span>    <span class="subxComment"># eax = string-equal?(&quot;Abc&quot;, &quot;Abc&quot;)</span>
<span id="L181" class="LineNr">181 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L182" class="LineNr">182 </span>    68/push  <span class="Constant">&quot;Abc&quot;</span>/imm32
<span id="L183" class="LineNr">183 </span>    68/push  <span class="Constant">&quot;Abc&quot;</span>/imm32
<span id="L184" class="LineNr">184 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L185" class="LineNr">185 </span>    e8/call  <a href='105string-equal.subx.html#L15'>string-equal?</a>/disp32
<span id="L186" class="LineNr">186 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L187" class="LineNr">187 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              8/imm32           <span class="subxComment"># add to esp</span>
<span id="L188" class="LineNr">188 </span>    <span class="subxComment"># check-ints-equal(eax, 1, msg)</span>
<span id="L189" class="LineNr">189 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L190" class="LineNr">190 </span>    68/push  <span class="Constant">&quot;F - test-compare-equal-strings&quot;</span>/imm32
<span id="L191" class="LineNr">191 </span>    68/push  1/imm32/true
<span id="L192" class="LineNr">192 </span>    50/push-eax
<span id="L193" class="LineNr">193 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L194" class="LineNr">194 </span>    e8/call  <a href='102test.subx.html#L23'>check-ints-equal</a>/disp32
<span id="L195" class="LineNr">195 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L196" class="LineNr">196 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              0xc/imm32         <span class="subxComment"># add to esp</span>
<span id="L197" class="LineNr">197 </span>    c3/return
<span id="L198" class="LineNr">198 </span>
<span id="L199" class="LineNr">199 </span><span class="subxTest">test-compare-inequal-strings-equal-sizes</span>:
<span id="L200" class="LineNr">200 </span>    <span class="subxComment"># eax = string-equal?(&quot;Abc&quot;, &quot;Adc&quot;)</span>
<span id="L201" class="LineNr">201 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L202" class="LineNr">202 </span>    68/push  <span class="Constant">&quot;Adc&quot;</span>/imm32
<span id="L203" class="LineNr">203 </span>    68/push  <span class="Constant">&quot;Abc&quot;</span>/imm32
<span id="L204" class="LineNr">204 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L205" class="LineNr">205 </span>    e8/call  <a href='105string-equal.subx.html#L15'>string-equal?</a>/disp32
<span id="L206" class="LineNr">206 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L207" class="LineNr">207 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              8/imm32           <span class="subxComment"># add to esp</span>
<span id="L208" class="LineNr">208 </span>    <span class="subxComment"># check-ints-equal(eax, 0, msg)</span>
<span id="L209" class="LineNr">209 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L210" class="LineNr">210 </span>    68/push  <span class="Constant">&quot;F - test-compare-inequal-strings-equal-sizes&quot;</span>/imm32
<span id="L211" class="LineNr">211 </span>    68/push  0/imm32/false
<span id="L212" class="LineNr">212 </span>    50/push-eax
<span id="L213" class="LineNr">213 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L214" class="LineNr">214 </span>    e8/call  <a href='102test.subx.html#L23'>check-ints-equal</a>/disp32
<span id="L215" class="LineNr">215 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L216" class="LineNr">216 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              0xc/imm32         <span class="subxComment"># add to esp</span>
<span id="L217" class="LineNr">217 </span>    c3/return
<span id="L218" class="LineNr">218 </span>
<span id="L219" class="LineNr">219 </span><span class="subxComment"># helper for later tests</span>
<span id="L220" class="LineNr">220 </span><span class="subxFunction">check-strings-equal</span>:  <span class="subxComment"># s: (addr array byte), expected: (addr array byte), msg: (addr array byte)</span>
<span id="L221" class="LineNr">221 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L222" class="LineNr">222 </span>    55/push-ebp
<span id="L223" class="LineNr">223 </span>    89/copy                         3/mod/direct    5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          4/r32/esp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy esp to ebp</span>
<span id="L224" class="LineNr">224 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L225" class="LineNr">225 </span>    50/push-eax
<span id="L226" class="LineNr">226 </span>    <span class="subxComment"># var eax: boolean = string-equal?(s, expected)</span>
<span id="L227" class="LineNr">227 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L228" class="LineNr">228 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+12)</span>
<span id="L229" class="LineNr">229 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+8)</span>
<span id="L230" class="LineNr">230 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L231" class="LineNr">231 </span>    e8/call  <a href='105string-equal.subx.html#L15'>string-equal?</a>/disp32
<span id="L232" class="LineNr">232 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L233" class="LineNr">233 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              8/imm32           <span class="subxComment"># add to esp</span>
<span id="L234" class="LineNr">234 </span>    <span class="subxComment"># check-ints-equal(eax, 1, msg)</span>
<span id="L235" class="LineNr">235 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L236" class="LineNr">236 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0x10/disp8     <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+16)</span>
<span id="L237" class="LineNr">237 </span>    68/push  1/imm32
<span id="L238" class="LineNr">238 </span>    50/push-eax
<span id="L239" class="LineNr">239 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L240" class="LineNr">240 </span>    e8/call  <a href='102test.subx.html#L23'>check-ints-equal</a>/disp32
<span id="L241" class="LineNr">241 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L242" class="LineNr">242 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              0xc/imm32         <span class="subxComment"># add to esp</span>
<span id="L243" class="LineNr">243 </span><span class="Constant">$check-strings-equal:end</span>:
<span id="L244" class="LineNr">244 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L245" class="LineNr">245 </span>    58/pop-to-eax
<span id="L246" class="LineNr">246 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L247" class="LineNr">247 </span>    89/copy                         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          5/r32/ebp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy ebp to esp</span>
<span id="L248" class="LineNr">248 </span>    5d/pop-to-ebp
<span id="L249" class="LineNr">249 </span>    c3/return
<span id="L250" class="LineNr">250 </span>
<span id="L251" class="LineNr">251 </span><span class="subxComment"># test the helper</span>
<span id="L252" class="LineNr">252 </span><span class="subxTest">test-check-strings-equal</span>:
<span id="L253" class="LineNr">253 </span>    <span class="subxComment"># check-strings-equal(&quot;Abc&quot;, &quot;Abc&quot;)</span>
<span id="L254" class="LineNr">254 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L255" class="LineNr">255 </span>    68/push  <span class="Constant">&quot;Abc&quot;</span>/imm32
<span id="L256" class="LineNr">256 </span>    68/push  <span class="Constant">&quot;Abc&quot;</span>/imm32
<span id="L257" class="LineNr">257 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L258" class="LineNr">258 </span>    e8/call  <a href='105string-equal.subx.html#L220'>check-strings-equal</a>/disp32
<span id="L259" class="LineNr">259 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L260" class="LineNr">260 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              8/imm32           <span class="subxComment"># add to esp</span>
<span id="L261" class="LineNr">261 </span>    c3/return
<span id="L262" class="LineNr">262 </span>
<span id="L263" class="LineNr">263 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
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