html/022div.cc.html


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Mu - 022div.cc</title>
<meta name="Generator" content="Vim/8.1">
<meta name="plugin-version" content="vim8.1_v1">
<meta name="syntax" content="cpp">
<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
<meta name="colorscheme" content="minimal-light">
<style type="text/css">
<!--
pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #c6c6c6; }
body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
a { color:inherit; }
* { font-size:12pt; font-size: 1em; }
.LineNr { }
.SpecialChar { color: #d70000; }
.Comment { color: #005faf; }
.Delimiter { color: #c000c0; }
.Identifier { color: #af5f00; }
.Constant { color: #008787; }
.Normal { color: #000000; background-color: #c6c6c6; padding-bottom: 1px; }
-->
</style>

<script type='text/javascript'>
<!--

/* function to open any folds containing a jumped-to line before jumping to it */
function JumpToLine()
{
  var lineNum;
  lineNum = window.location.hash;
  lineNum = lineNum.substr(1); /* strip off '#' */

  if (lineNum.indexOf('L') == -1) {
    lineNum = 'L'+lineNum;
  }
  var lineElem = document.getElementById(lineNum);
  /* Always jump to new location even if the line was hidden inside a fold, or
   * we corrected the raw number to a line ID.
   */
  if (lineElem) {
    lineElem.scrollIntoView(true);
  }
  return true;
}
if ('onhashchange' in window) {
  window.onhashchange = JumpToLine;
}

-->
</script>
</head>
<body onload='JumpToLine();'>
<a href='https://github.com/akkartik/mu/blob/master/022div.cc'>https://github.com/akkartik/mu/blob/master/022div.cc</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: helper for division operations: sign-extend EAX into EDX</span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span><span class="Delimiter">:(before &quot;End Initialize Op Names&quot;)</span>
<span id="L4" class="LineNr"> 4 </span><a href='001help.cc.html#L235'>put_new</a><span class="Delimiter">(</span><span class="SpecialChar"><a href='010vm.cc.html#L355'>Name</a></span><span class="Delimiter">,</span> <span class="Constant">&quot;99&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;sign-extend <a href='010vm.cc.html#L10'>EAX</a> into <a href='010vm.cc.html#L12'>EDX</a> (cdq)&quot;</span><span class="Delimiter">);</span>
<span id="L5" class="LineNr"> 5 </span>
<span id="L6" class="LineNr"> 6 </span><span class="Delimiter">:(code)</span>
<span id="L7" class="LineNr"> 7 </span><span class="Normal">void</span> <a href='022div.cc.html#L7'>test_cdq</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L8" class="LineNr"> 8 </span>  <span class="SpecialChar"><a href='010vm.cc.html#L25'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i = <span class="Constant">10</span><span class="Delimiter">;</span>
<span id="L9" class="LineNr"> 9 </span>  <a href='011run.cc.html#L82'>run</a><span class="Delimiter">(</span>
<span id="L10" class="LineNr">10 </span>      <span class="Constant">&quot;== code 0x1\n&quot;</span>
<span id="L11" class="LineNr">11 </span>      <span class="Constant">&quot;99\n&quot;</span>
<span id="L12" class="LineNr">12 </span>  <span class="Delimiter">);</span>
<span id="L13" class="LineNr">13 </span>  <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L14" class="LineNr">14 </span>      <span class="Constant">&quot;run: sign-extend <a href='010vm.cc.html#L10'>EAX</a> into EDX\n&quot;</span>
<span id="L15" class="LineNr">15 </span>      <span class="Constant">&quot;run: <a href='010vm.cc.html#L12'>EDX</a> is now 0x00000000\n&quot;</span>
<span id="L16" class="LineNr">16 </span>  <span class="Delimiter">);</span>
<span id="L17" class="LineNr">17 </span><span class="Delimiter">}</span>
<span id="L18" class="LineNr">18 </span>
<span id="L19" class="LineNr">19 </span><span class="Delimiter">:(before &quot;End Single-Byte Opcodes&quot;)</span>
<span id="L20" class="LineNr">20 </span><span class="Normal">case</span> <span class="Constant">0x99</span>: <span class="Delimiter">{</span>  <span class="Comment">// sign-extend EAX into EDX</span>
<span id="L21" class="LineNr">21 </span>  <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="SpecialChar">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;sign-extend <a href='010vm.cc.html#L10'>EAX</a> into EDX&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L22" class="LineNr">22 </span>  <span class="SpecialChar"><a href='010vm.cc.html#L25'>Reg</a></span>[EDX]<span class="Delimiter">.</span>i = <span class="Delimiter">(</span><span class="SpecialChar"><a href='010vm.cc.html#L25'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i &lt; <span class="Constant">0</span><span class="Delimiter">)</span> ? -<span class="Constant">1</span> : <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L23" class="LineNr">23 </span>  <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="SpecialChar">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;EDX is now 0x&quot;</span> &lt;&lt; <a href='010vm.cc.html#L408'>HEXWORD</a> &lt;&lt; <span class="SpecialChar"><a href='010vm.cc.html#L25'>Reg</a></span>[EDX]<span class="Delimiter">.</span>u &lt;&lt; end<span class="Delimiter">();</span>
<span id="L24" class="LineNr">24 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L25" class="LineNr">25 </span><span class="Delimiter">}</span>
<span id="L26" class="LineNr">26 </span>
<span id="L27" class="LineNr">27 </span><span class="Delimiter">:(code)</span>
<span id="L28" class="LineNr">28 </span><span class="Normal">void</span> <a href='022div.cc.html#L28'>test_cdq_negative</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L29" class="LineNr">29 </span>  <span class="SpecialChar"><a href='010vm.cc.html#L25'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i = -<span class="Constant">10</span><span class="Delimiter">;</span>
<span id="L30" class="LineNr">30 </span>  <a href='011run.cc.html#L82'>run</a><span class="Delimiter">(</span>
<span id="L31" class="LineNr">31 </span>      <span class="Constant">&quot;== code 0x1\n&quot;</span>
<span id="L32" class="LineNr">32 </span>      <span class="Constant">&quot;99\n&quot;</span>
<span id="L33" class="LineNr">33 </span>  <span class="Delimiter">);</span>
<span id="L34" class="LineNr">34 </span>  <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L35" class="LineNr">35 </span>      <span class="Constant">&quot;run: sign-extend <a href='010vm.cc.html#L10'>EAX</a> into EDX\n&quot;</span>
<span id="L36" class="LineNr">36 </span>      <span class="Constant">&quot;run: <a href='010vm.cc.html#L12'>EDX</a> is now 0xffffffff\n&quot;</span>
<span id="L37" class="LineNr">37 </span>  <span class="Delimiter">);</span>
<span id="L38" class="LineNr">38 </span><span class="Delimiter">}</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->