175 lines
17 KiB
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175 lines
17 KiB
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<a href='https://github.com/akkartik/mu/blob/master/406try-divide.mu'>https://github.com/akkartik/mu/blob/master/406try-divide.mu</a>
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<pre id='vimCodeElement'>
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<span id="L1" class="LineNr"> 1 </span><span class="muComment"># slow, iterative divide instruction</span>
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<span id="L2" class="LineNr"> 2 </span><span class="muComment"># preconditions: _nr >= 0, _dr > 0</span>
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<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>_/<span class="Constant">eax</span>: int <span class="Delimiter">{</span>
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<span id="L4" class="LineNr"> 4 </span> <span class="muComment"># x = next power-of-2 multiple of _dr after _nr</span>
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<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>
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<span id="L6" class="LineNr"> 6 </span> <span class="Delimiter">{</span>
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<span id="L7" class="LineNr"> 7 </span><span class="CommentedCode">#? print-int32-hex 0, x</span>
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<span id="L8" class="LineNr"> 8 </span><span class="CommentedCode">#? print-string 0, "\n"</span>
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<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
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<span id="L10" class="LineNr"> 10 </span> tmp <span class="SpecialChar"><-</span> multiply x
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<span id="L11" class="LineNr"> 11 </span> compare tmp, _nr
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<span id="L12" class="LineNr"> 12 </span> <span class="PreProc">break-if-></span>
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<span id="L13" class="LineNr"> 13 </span> x <span class="SpecialChar"><-</span> shift-left <span class="Constant">1</span>
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<span id="L14" class="LineNr"> 14 </span> <span class="PreProc">loop</span>
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<span id="L15" class="LineNr"> 15 </span> <span class="Delimiter">}</span>
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<span id="L16" class="LineNr"> 16 </span><span class="CommentedCode">#? print-string 0, "--\n"</span>
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<span id="L17" class="LineNr"> 17 </span> <span class="muComment"># min, max = x/2, x</span>
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<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
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<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
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<span id="L20" class="LineNr"> 20 </span> min <span class="SpecialChar"><-</span> shift-right <span class="Constant">1</span>
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<span id="L21" class="LineNr"> 21 </span> <span class="muComment"># narrow down result between min and max</span>
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<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
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<span id="L23" class="LineNr"> 23 </span> <span class="Delimiter">{</span>
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<span id="L24" class="LineNr"> 24 </span><span class="CommentedCode">#? print-int32-hex 0, i</span>
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<span id="L25" class="LineNr"> 25 </span><span class="CommentedCode">#? print-string 0, "\n"</span>
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<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
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<span id="L27" class="LineNr"> 27 </span> foo <span class="SpecialChar"><-</span> multiply i
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<span id="L28" class="LineNr"> 28 </span> compare foo, _nr
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<span id="L29" class="LineNr"> 29 </span> <span class="PreProc">break-if-></span>
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<span id="L30" class="LineNr"> 30 </span> i <span class="SpecialChar"><-</span> increment
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<span id="L31" class="LineNr"> 31 </span> <span class="PreProc">loop</span>
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<span id="L32" class="LineNr"> 32 </span> <span class="Delimiter">}</span>
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<span id="L33" class="LineNr"> 33 </span> <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy i
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<span id="L34" class="LineNr"> 34 </span> result <span class="SpecialChar"><-</span> decrement
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<span id="L35" class="LineNr"> 35 </span><span class="CommentedCode">#? print-string 0, "=> "</span>
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<span id="L36" class="LineNr"> 36 </span><span class="CommentedCode">#? print-int32-hex 0, result</span>
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<span id="L37" class="LineNr"> 37 </span><span class="CommentedCode">#? print-string 0, "\n"</span>
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<span id="L38" class="LineNr"> 38 </span> <span class="PreProc">return</span> result
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<span id="L39" class="LineNr"> 39 </span><span class="Delimiter">}</span>
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<span id="L40" class="LineNr"> 40 </span>
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<span id="L41" class="LineNr"> 41 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L41'>test-try-divide-1</a></span> <span class="Delimiter">{</span>
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<span id="L42" class="LineNr"> 42 </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>
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<span id="L43" class="LineNr"> 43 </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>
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<span id="L44" class="LineNr"> 44 </span><span class="Delimiter">}</span>
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<span id="L45" class="LineNr"> 45 </span>
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<span id="L46" class="LineNr"> 46 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L46'>test-try-divide-2</a></span> <span class="Delimiter">{</span>
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<span id="L47" class="LineNr"> 47 </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>
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<span id="L48" class="LineNr"> 48 </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>
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<span id="L49" class="LineNr"> 49 </span><span class="Delimiter">}</span>
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<span id="L50" class="LineNr"> 50 </span>
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<span id="L51" class="LineNr"> 51 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L51'>test-try-divide-3</a></span> <span class="Delimiter">{</span>
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<span id="L52" class="LineNr"> 52 </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>
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<span id="L53" class="LineNr"> 53 </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>
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<span id="L54" class="LineNr"> 54 </span><span class="Delimiter">}</span>
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<span id="L55" class="LineNr"> 55 </span>
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<span id="L56" class="LineNr"> 56 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L56'>test-try-divide-4</a></span> <span class="Delimiter">{</span>
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<span id="L57" class="LineNr"> 57 </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>
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<span id="L58" class="LineNr"> 58 </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>
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<span id="L59" class="LineNr"> 59 </span><span class="Delimiter">}</span>
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<span id="L60" class="LineNr"> 60 </span>
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<span id="L61" class="LineNr"> 61 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L61'>test-try-divide-5</a></span> <span class="Delimiter">{</span>
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<span id="L62" class="LineNr"> 62 </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>
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<span id="L63" class="LineNr"> 63 </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>
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<span id="L64" class="LineNr"> 64 </span><span class="Delimiter">}</span>
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<span id="L65" class="LineNr"> 65 </span>
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<span id="L66" class="LineNr"> 66 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L66'>test-try-divide-6</a></span> <span class="Delimiter">{</span>
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<span id="L67" class="LineNr"> 67 </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>
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<span id="L68" class="LineNr"> 68 </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>
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<span id="L69" class="LineNr"> 69 </span><span class="Delimiter">}</span>
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<span id="L70" class="LineNr"> 70 </span>
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<span id="L71" class="LineNr"> 71 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L71'>test-try-divide-7</a></span> <span class="Delimiter">{</span>
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<span id="L72" class="LineNr"> 72 </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>
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<span id="L73" class="LineNr"> 73 </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>
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<span id="L74" class="LineNr"> 74 </span><span class="Delimiter">}</span>
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<span id="L75" class="LineNr"> 75 </span>
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<span id="L76" class="LineNr"> 76 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L76'>test-try-divide-8</a></span> <span class="Delimiter">{</span>
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<span id="L77" class="LineNr"> 77 </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>
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<span id="L78" class="LineNr"> 78 </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>
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<span id="L79" class="LineNr"> 79 </span><span class="Delimiter">}</span>
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<span id="L80" class="LineNr"> 80 </span>
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<span id="L81" class="LineNr"> 81 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L81'>test-try-divide-9</a></span> <span class="Delimiter">{</span>
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<span id="L82" class="LineNr"> 82 </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>
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<span id="L83" class="LineNr"> 83 </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>
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<span id="L84" class="LineNr"> 84 </span><span class="Delimiter">}</span>
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<span id="L85" class="LineNr"> 85 </span>
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<span id="L86" class="LineNr"> 86 </span><span class="muComment"># only positive dr for now</span>
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<span id="L87" class="LineNr"> 87 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='406try-divide.mu.html#L87'>try-modulo</a></span> nr: int, dr: int<span class="PreProc"> -> </span>_/<span class="Constant">eax</span>: int <span class="Delimiter">{</span>
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<span id="L88" class="LineNr"> 88 </span> <span class="PreProc">var</span> _positive-nr/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='406try-divide.mu.html#L102'>abs</a> nr
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<span id="L89" class="LineNr"> 89 </span> <span class="PreProc">var</span> positive-nr/<span class="Constant">ecx</span>: int <span class="SpecialChar"><-</span> copy _positive-nr
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<span id="L90" class="LineNr"> 90 </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> positive-nr, dr
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<span id="L91" class="LineNr"> 91 </span> result <span class="SpecialChar"><-</span> multiply dr
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<span id="L92" class="LineNr"> 92 </span> result <span class="SpecialChar"><-</span> subtract positive-nr
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<span id="L93" class="LineNr"> 93 </span> result <span class="SpecialChar"><-</span> negate
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<span id="L94" class="LineNr"> 94 </span> <span class="PreProc">return</span> result
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<span id="L95" class="LineNr"> 95 </span><span class="Delimiter">}</span>
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<span id="L96" class="LineNr"> 96 </span>
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<span id="L97" class="LineNr"> 97 </span><span class="PreProc">fn</span> <span class="muTest"><a href='406try-divide.mu.html#L97'>test-try-modulo-negative-nr</a></span> <span class="Delimiter">{</span>
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<span id="L98" class="LineNr"> 98 </span> <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='406try-divide.mu.html#L87'>try-modulo</a> <span class="Constant">-0xa</span>, <span class="Constant">7</span>
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<span id="L99" class="LineNr"> 99 </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>
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<span id="L100" class="LineNr">100 </span><span class="Delimiter">}</span>
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<span id="L101" class="LineNr">101 </span>
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<span id="L102" class="LineNr">102 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='406try-divide.mu.html#L102'>abs</a></span> n: int<span class="PreProc"> -> </span>_/<span class="Constant">eax</span>: int <span class="Delimiter">{</span>
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<span id="L103" class="LineNr">103 </span> <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy n
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<span id="L104" class="LineNr">104 </span> <span class="Delimiter">{</span>
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<span id="L105" class="LineNr">105 </span> compare n, <span class="Constant">0</span>
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<span id="L106" class="LineNr">106 </span> <span class="PreProc">break-if->=</span>
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<span id="L107" class="LineNr">107 </span> result <span class="SpecialChar"><-</span> negate
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<span id="L108" class="LineNr">108 </span> <span class="Delimiter">}</span>
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<span id="L109" class="LineNr">109 </span> <span class="PreProc">return</span> result
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<span id="L110" class="LineNr">110 </span><span class="Delimiter">}</span>
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</pre>
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