blob: f0010665b0e16abb269a02013922e8091e49cca8 (
plain) (
blame)
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
|
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Mu - 314divide.subx</title>
<meta name="Generator" content="Vim/8.2">
<meta name="plugin-version" content="vim8.1_v2">
<meta name="syntax" content="none">
<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=,use_input_for_pc=fallback">
<meta name="colorscheme" content="minimal-light">
<style>
<!--
pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #ffffd7; }
body { font-size:12pt; font-family: monospace; color: #000000; background-color: #ffffd7; }
a { color:inherit; }
* { font-size:12pt; font-size: 1em; }
.subxComment { color: #005faf; }
.subxS1Comment { color: #0000af; }
.LineNr { }
.subxFunction { color: #af5f00; text-decoration: underline; }
.Constant { color: #008787; }
-->
</style>
<script>
<!--
/* 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/main/314divide.subx'>https://github.com/akkartik/mu/blob/main/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 -> 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/<- %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/-> *(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/<- %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>
<!-- vim: set foldmethod=manual : -->
|