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authorKartik Agaram <vc@akkartik.com>2021-02-13 18:18:05 -0800
committerKartik Agaram <vc@akkartik.com>2021-02-13 18:41:43 -0800
commit535fe9ac96dba0950efd1bfe6788801f6197971f (patch)
tree218270b512ce4175e3c7e3394d7b1a19ad84184b /html/baremetal/314divide.subx.html
parent9b5ead67eca1b6e1afeeba63e9c68b2790c26436 (diff)
downloadmu-535fe9ac96dba0950efd1bfe6788801f6197971f.tar.gz
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+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/314divide.subx</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
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+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/baremetal/314divide.subx'>https://github.com/akkartik/mu/blob/main/baremetal/314divide.subx</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span>== code
+<span id="L2" class="LineNr"> 2 </span>
+<span id="L3" class="LineNr"> 3 </span><span class="subxFunction">integer-divide</span>:  <span class="subxComment"># a: int, b: int -&gt; quotient/eax: int, remainder/edx: int</span>
+<span id="L4" class="LineNr"> 4 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L5" class="LineNr"> 5 </span>    55/push-ebp
+<span id="L6" class="LineNr"> 6 </span>    89/&lt;- %ebp 4/r32/esp
+<span id="L7" class="LineNr"> 7 </span>    <span class="subxComment"># eax = a</span>
+<span id="L8" class="LineNr"> 8 </span>    8b/-&gt; *(ebp+8) 0/r32/eax
+<span id="L9" class="LineNr"> 9 </span>    <span class="subxComment"># edx = all 0s or all 1s</span>
+<span id="L10" class="LineNr">10 </span>    99/sign-extend-eax-into-edx
+<span id="L11" class="LineNr">11 </span>    <span class="subxComment"># quotient, remainder = divide eax by b</span>
+<span id="L12" class="LineNr">12 </span>    f7 7/subop/divide-eax-edx-by *(ebp+0xc)
+<span id="L13" class="LineNr">13 </span><span class="Constant">$integer-divide:end</span>:
+<span id="L14" class="LineNr">14 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L15" class="LineNr">15 </span>    89/&lt;- %esp 5/r32/ebp
+<span id="L16" class="LineNr">16 </span>    5d/pop-to-ebp
+<span id="L17" class="LineNr">17 </span>    c3/return
+</pre>
+</body>
+</html>
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