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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
<!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 - 406try-divide.mu</title>
<meta name="Generator" content="Vim/8.1">
<meta name="plugin-version" content="vim8.1_v1">
<meta name="syntax" content="none">
<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; }
.CommentedCode { color: #8a8a8a; }
.muComment { color: #005faf; }
.LineNr { }
.SpecialChar { color: #d70000; }
.Constant { color: #008787; }
.muFunction { color: #af5f00; text-decoration: underline; }
.muTest { color: #5f8700; }
.Delimiter { color: #c000c0; }
.PreProc { color: #c000c0; }
-->
</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/406try-divide.mu'>https://github.com/akkartik/mu/blob/master/406try-divide.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="muComment"># slow, iterative divide instruction</span>
<span id="L2" class="LineNr"> 2 </span><span class="muComment"># preconditions: _nr >= 0, _dr > 0</span>
<span id="L3" class="LineNr"> 3 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='406try-divide.mu.html#L3'>try-divide</a></span> _nr: int, _dr: int<span class="PreProc"> -> </span>result/<span class="Constant">eax</span>: int <span class="Delimiter">{</span>
<span id="L4" class="LineNr"> 4 </span> <span class="muComment"># x = next power-of-2 multiple of _dr after _nr</span>
<span id="L5" class="LineNr"> 5 </span> <span class="PreProc">var</span> x/<span class="Constant">ecx</span>: int <span class="SpecialChar"><-</span> copy <span class="Constant">1</span>
<span id="L6" class="LineNr"> 6 </span> <span class="Delimiter">{</span>
<span id="L7" class="LineNr"> 7 </span><span class="CommentedCode">#? print-int32-hex 0, x</span>
<span id="L8" class="LineNr"> 8 </span><span class="CommentedCode">#? print-string 0, "\n"</span>
<span id="L9" class="LineNr"> 9 </span> <span class="PreProc">var</span> tmp/<span class="Constant">edx</span>: int <span class="SpecialChar"><-</span> copy _dr
<span id="L10" class="LineNr"> 10 </span> tmp <span class="SpecialChar"><-</span> multiply x
<span id="L11" class="LineNr"> 11 </span> compare tmp, _nr
<span id="L12" class="LineNr"> 12 </span> <span class="PreProc">break-if-></span>
<span id="L13" class="LineNr"> 13 </span> x <span class="SpecialChar"><-</span> shift-left <span class="Constant">1</span>
<span id="L14" class="LineNr"> 14 </span> <span class="PreProc">loop</span>
<span id="L15" class="LineNr"> 15 </span> <span class="Delimiter">}</span>
<span id="L16" class="LineNr"> 16 </span><span class="CommentedCode">#? print-string 0, "--\n"</span>
<span id="L17" class="LineNr"> 17 </span> <span class="muComment"># min, max = x/2, x</span>
<span id="L18" class="LineNr"> 18 </span> <span class="PreProc">var</span> max/<span class="Constant">ecx</span>: int <span class="SpecialChar"><-</span> copy x
<span id="L19" class="LineNr"> 19 </span> <span class="PreProc">var</span> min/<span class="Constant">edx</span>: int <span class="SpecialChar"><-</span> copy max
<span id="L20" class="LineNr"> 20 </span> min <span class="SpecialChar"><-</span> shift-right <span class="Constant">1</span>
<span id="L21" class="LineNr"> 21 </span> <span class="muComment"># narrow down result between min and max</span>
<span id="L22" class="LineNr"> 22 </span> <span class="PreProc">var</span> i/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy min
<span id="L23" class="LineNr"> 23 </span> <span class="Delimiter">{</span>
<span id="L24" class="LineNr"> 24 </span><span class="CommentedCode">#? print-int32-hex 0, i</span>
<span id="L25" class="LineNr"> 25 </span><span class="CommentedCode">#? print-string 0, "\n"</span>
<span id="L26" class="LineNr"> 26 </span> <span class="PreProc">var</span> foo/<span class="Constant">ebx</span>: int <span class="SpecialChar"><-</span> copy _dr
<span id="L27" class="LineNr"> 27 </span> foo <span class="SpecialChar"><-</span> multiply i
<span id="L28" class="LineNr"> 28 </span> compare foo, _nr
<span id="L29" class="LineNr"> 29 </span> <span class="PreProc">break-if-></span>
<span id="L30" class="LineNr"> 30 </span> i <span class="SpecialChar"><-</span> increment
<span id="L31" class="LineNr"> 31 </span> <span class="PreProc">loop</span>
<span id="L32" class="LineNr"> 32 </span> <span class="Delimiter">}</span>
<span id="L33" class="LineNr"> 33 </span> result <span class="SpecialChar"><-</span> copy i
<span id="L34" class="LineNr"> 34 </span> result <span class="SpecialChar"><-</span> decrement
<span id="L35" class="LineNr"> 35 </span><span class="CommentedCode">#? print-string 0, "=> "</span>
<span id="L36" class="LineNr"> 36 </span><span class="CommentedCode">#? print-int32-hex 0, result</span>
<span id="L37" class="LineNr"> 37 </span><span class="CommentedCode">#? print-string 0, "\n"</span>
<span id="L38" class="LineNr"> 38 </span><span class="Delimiter">}</span>
<span id="L39" class="LineNr"> 39 </span>
<span id="L40" class="LineNr"> 40 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L40'>test-try-divide-1</a></span> <span class="Delimiter">{</span>
<span id="L41" class="LineNr"> 41 </span> <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='406try-divide.mu.html#L3'>try-divide</a> <span class="Constant">0</span>, <span class="Constant">2</span>
<span id="L42" class="LineNr"> 42 </span> <a href='102test.subx.html#L23'>check-ints-equal</a> result, <span class="Constant">0</span>, <span class="Constant">"F - try-divide-1"</span>
<span id="L43" class="LineNr"> 43 </span><span class="Delimiter">}</span>
<span id="L44" class="LineNr"> 44 </span>
<span id="L45" class="LineNr"> 45 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L45'>test-try-divide-2</a></span> <span class="Delimiter">{</span>
<span id="L46" class="LineNr"> 46 </span> <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='406try-divide.mu.html#L3'>try-divide</a> <span class="Constant">1</span>, <span class="Constant">2</span>
<span id="L47" class="LineNr"> 47 </span> <a href='102test.subx.html#L23'>check-ints-equal</a> result, <span class="Constant">0</span>, <span class="Constant">"F - try-divide-2"</span>
<span id="L48" class="LineNr"> 48 </span><span class="Delimiter">}</span>
<span id="L49" class="LineNr"> 49 </span>
<span id="L50" class="LineNr"> 50 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L50'>test-try-divide-3</a></span> <span class="Delimiter">{</span>
<span id="L51" class="LineNr"> 51 </span> <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='406try-divide.mu.html#L3'>try-divide</a> <span class="Constant">2</span>, <span class="Constant">2</span>
<span id="L52" class="LineNr"> 52 </span> <a href='102test.subx.html#L23'>check-ints-equal</a> result, <span class="Constant">1</span>, <span class="Constant">"F - try-divide-3"</span>
<span id="L53" class="LineNr"> 53 </span><span class="Delimiter">}</span>
<span id="L54" class="LineNr"> 54 </span>
<span id="L55" class="LineNr"> 55 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L55'>test-try-divide-4</a></span> <span class="Delimiter">{</span>
<span id="L56" class="LineNr"> 56 </span> <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='406try-divide.mu.html#L3'>try-divide</a> <span class="Constant">4</span>, <span class="Constant">2</span>
<span id="L57" class="LineNr"> 57 </span> <a href='102test.subx.html#L23'>check-ints-equal</a> result, <span class="Constant">2</span>, <span class="Constant">"F - try-divide-4"</span>
<span id="L58" class="LineNr"> 58 </span><span class="Delimiter">}</span>
<span id="L59" class="LineNr"> 59 </span>
<span id="L60" class="LineNr"> 60 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L60'>test-try-divide-5</a></span> <span class="Delimiter">{</span>
<span id="L61" class="LineNr"> 61 </span> <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='406try-divide.mu.html#L3'>try-divide</a> <span class="Constant">6</span>, <span class="Constant">2</span>
<span id="L62" class="LineNr"> 62 </span> <a href='102test.subx.html#L23'>check-ints-equal</a> result, <span class="Constant">3</span>, <span class="Constant">"F - try-divide-5"</span>
<span id="L63" class="LineNr"> 63 </span><span class="Delimiter">}</span>
<span id="L64" class="LineNr"> 64 </span>
<span id="L65" class="LineNr"> 65 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L65'>test-try-divide-6</a></span> <span class="Delimiter">{</span>
<span id="L66" class="LineNr"> 66 </span> <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='406try-divide.mu.html#L3'>try-divide</a> <span class="Constant">9</span>, <span class="Constant">3</span>
<span id="L67" class="LineNr"> 67 </span> <a href='102test.subx.html#L23'>check-ints-equal</a> result, <span class="Constant">3</span>, <span class="Constant">"F - try-divide-6"</span>
<span id="L68" class="LineNr"> 68 </span><span class="Delimiter">}</span>
<span id="L69" class="LineNr"> 69 </span>
<span id="L70" class="LineNr"> 70 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L70'>test-try-divide-7</a></span> <span class="Delimiter">{</span>
<span id="L71" class="LineNr"> 71 </span> <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='406try-divide.mu.html#L3'>try-divide</a> <span class="Constant">0xc</span>, <span class="Constant">4</span>
<span id="L72" class="LineNr"> 72 </span> <a href='102test.subx.html#L23'>check-ints-equal</a> result, <span class="Constant">3</span>, <span class="Constant">"F - try-divide-7"</span>
<span id="L73" class="LineNr"> 73 </span><span class="Delimiter">}</span>
<span id="L74" class="LineNr"> 74 </span>
<span id="L75" class="LineNr"> 75 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L75'>test-try-divide-8</a></span> <span class="Delimiter">{</span>
<span id="L76" class="LineNr"> 76 </span> <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='406try-divide.mu.html#L3'>try-divide</a> <span class="Constant">0x1b</span>, <span class="Constant">3</span> <span class="muComment"># 27/3</span>
<span id="L77" class="LineNr"> 77 </span> <a href='102test.subx.html#L23'>check-ints-equal</a> result, <span class="Constant">9</span>, <span class="Constant">"F - try-divide-8"</span>
<span id="L78" class="LineNr"> 78 </span><span class="Delimiter">}</span>
<span id="L79" class="LineNr"> 79 </span>
<span id="L80" class="LineNr"> 80 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L80'>test-try-divide-9</a></span> <span class="Delimiter">{</span>
<span id="L81" class="LineNr"> 81 </span> <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='406try-divide.mu.html#L3'>try-divide</a> <span class="Constant">0x1c</span>, <span class="Constant">3</span> <span class="muComment"># 28/3</span>
<span id="L82" class="LineNr"> 82 </span> <a href='102test.subx.html#L23'>check-ints-equal</a> result, <span class="Constant">9</span>, <span class="Constant">"F - try-divide-9"</span>
<span id="L83" class="LineNr"> 83 </span><span class="Delimiter">}</span>
<span id="L84" class="LineNr"> 84 </span>
<span id="L85" class="LineNr"> 85 </span><span class="muComment"># only positive dr for now</span>
<span id="L86" class="LineNr"> 86 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='406try-divide.mu.html#L86'>try-modulo</a></span> nr: int, dr: int<span class="PreProc"> -> </span>result/<span class="Constant">eax</span>: int <span class="Delimiter">{</span>
<span id="L87" class="LineNr"> 87 </span> <span class="PreProc">var</span> _positive-nr/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='406try-divide.mu.html#L100'>abs</a> nr
<span id="L88" class="LineNr"> 88 </span> <span class="PreProc">var</span> positive-nr/<span class="Constant">ecx</span>: int <span class="SpecialChar"><-</span> copy _positive-nr
<span id="L89" class="LineNr"> 89 </span> <span class="PreProc">var</span> tmp/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='406try-divide.mu.html#L3'>try-divide</a> positive-nr, dr
<span id="L90" class="LineNr"> 90 </span> tmp <span class="SpecialChar"><-</span> multiply dr
<span id="L91" class="LineNr"> 91 </span> tmp <span class="SpecialChar"><-</span> subtract positive-nr
<span id="L92" class="LineNr"> 92 </span> result <span class="SpecialChar"><-</span> negate
<span id="L93" class="LineNr"> 93 </span><span class="Delimiter">}</span>
<span id="L94" class="LineNr"> 94 </span>
<span id="L95" class="LineNr"> 95 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L95'>test-try-modulo-negative-nr</a></span> <span class="Delimiter">{</span>
<span id="L96" class="LineNr"> 96 </span> <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='406try-divide.mu.html#L86'>try-modulo</a> <span class="Constant">-0xa</span>, <span class="Constant">7</span>
<span id="L97" class="LineNr"> 97 </span> <a href='102test.subx.html#L23'>check-ints-equal</a> result, <span class="Constant">3</span>, <span class="Constant">"F - test-try-modulo-negative-nr"</span>
<span id="L98" class="LineNr"> 98 </span><span class="Delimiter">}</span>
<span id="L99" class="LineNr"> 99 </span>
<span id="L100" class="LineNr">100 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='406try-divide.mu.html#L100'>abs</a></span> n: int<span class="PreProc"> -> </span>result/<span class="Constant">eax</span>: int <span class="Delimiter">{</span>
<span id="L101" class="LineNr">101 </span> result <span class="SpecialChar"><-</span> copy n
<span id="L102" class="LineNr">102 </span> compare n, <span class="Constant">0</span>
<span id="L103" class="LineNr">103 </span> <span class="PreProc">break-if->=</span>
<span id="L104" class="LineNr">104 </span> result <span class="SpecialChar"><-</span> negate
<span id="L105" class="LineNr">105 </span><span class="Delimiter">}</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|