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Matt Godbolt
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‎abstract-etc.md

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@@ -5,7 +5,7 @@ Matt Godbolt is a software engineer with trading firm DRW. He is passionate abou
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Title
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What has my compiler done for me lately?
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Unbolting the Lid of your Compiler
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‎ce.sh

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#!/bin/bash
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watch 'g++ -O2 -S /tmp/test.cc -o - | c++filt'

‎index.html

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<link rel="stylesheet" href="reveal.js/css/reveal.css">
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<link rel="stylesheet" href="drw.css">
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<style>
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td.reg {
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background-color: #333;
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text-align: center !important
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}
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</style>
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<!-- Theme used for syntax highlighting of code -->
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<link rel="stylesheet" href="reveal.js/lib/css/zenburn.css">
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<br>
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<em><a href="https://drw.com/">drw.com</a></em>
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</section>
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<section>Slide 1</section>
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<section>Slide 2</section>
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<section>
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<h3>Backstory</h3>
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<pre><code data-trim class="cpp">
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void foreach(const vector&lt;int> &v) {
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for (size_t i = 0; i < v.size(); ++i)
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doSomething(v[i]);
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}</code></pre>
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<pre><code data-trim class="cpp">
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void foreach(const vector&lt;int> &v) {
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for (int x : v)
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doSomething(x);
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}</code></pre>
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</section>
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<section>
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<h3>Compiler Explorer v1</h3>
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<pre><code class="bash">$ watch 'g++ -O2 -S /tmp/test.cc -o - | c++filt'</code></pre>
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<a href="http://localhost:10240/#z:OYLghAFBqd5TKALEBjA9gEwKYFFMCWALugE4A0BIEAZugHZEDKqAhgDbYgCMAdABwBWAOyCATAAYAnGIBsw7lKVTh5AFY9yAZ3QBXUqi4ByAKRiAzAXqp2unAGoT5gMKotRTOwIAjJ7hMSAIJmlta2Dk7OAG7YqCSkfgHBQdgAHkTYpPT2UegEmPaY6EzoALbYREhWwBBWRACUTgBCSUm5%2BfZ0pNisqEgQGPTu9u6YICAxcWSRdX6OclH1jsItQfadZPYQWgQAXtgA%2BkT2BI7mACL2Es0nZ845vDv7EI3mTfMtYk0EjWvrhcUyhUqvQalETIJvhDzq9VsFhOcjPVyOwQEZBEZyPQ0RJMeg0c4zJ93jp9IZ5uZuJiiDikciANYgQQSFFogAsmNKTJZ2KMuPI%2BKMmK0IBZNL5SPIcFgKAwpQADgROBQqAMyorlSAAPS6LSkLXeKxa4BEonkGhKjKkEUQby08hy8qMADy9HYAE97YRunECDERRLKIxsKiJci6IwWBwuHwhKJJDJ5IplKp0PKiAQGAGALTOsTCvQGGPI0MYrH2wU6vUGo0mr5Erb4YibELccj2ZzqpWZCncerU2n1ZFIHo4UjUBnc1lGDnlwOC4Wi8ji3FD6f58hc5lz/kL5eDqWIaXINBYPCEeKUagR5hsTg8AQicTSOQKZQqdQgMTaQuGNEhKwbDsbA7jcDwvF8cx/CCACwmAu5JniRIYJSdJMmydoCiKEpykqapakYWFWiCTCNm6Xp%2BkGYZRnGRDphcWYoPmWRFmWOF1i6LY6nsVJ7BAHJfkCf4ARw4F8NSIiYIRSVS0xXldwJU0vhGX8QJCDcVzpcgR1YMcJ3IRlt1DWctx5Cs0UXMUD2PCBZS7ZUrzVBVu3HKt9UNehjSUppzUtTIbTtQNHWwF03U9QNvViDN/XtOoQwPG8o3vWMnwTV9kyUVN00zIY0VzDdSSLL8SzRMt5LxNE3JrTy62JRsLxbCxvw7eye3U/t9zDYdR0yfTDJZYy5PMoVtCXTS11DDdTJ3CqRvGyduAkAa0XMIb5wszrV2RGJrRykA2SAA%3D%3D">Or
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here</a>
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</section>
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<section>
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<h3>Some assembly</h3>
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<iframe width="1000px" height="300px"
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src="http://localhost:10240/e#g:!((g:!((g:!((h:codeEditor,i:(fontScale:1.5479341055999998,j:1,source:'int+square(int+num)+%7B%0A++++return+num+*+num%3B%0A%7D'),l:'5',n:'0',o:'C%2B%2B+source+%231',t:'0')),k:50,l:'4',n:'0',o:'',s:0,t:'0'),(g:!((h:compiler,i:(compiler:/usr/bin/g%2B%2B,filters:(b:'0',commentOnly:'0',directives:'0',intel:'0'),fontScale:1.5479341055999998,options:'',source:1),l:'5',n:'0',o:'/usr/bin/g%2B%2B+(Editor+%231,+Compiler+%231)',t:'0')),k:50,l:'4',n:'0',o:'',s:0,t:'0')),l:'2',n:'0',o:'',t:'0')),version:4"></iframe>
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</section>
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<section>
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<h3>Intel asm 101</h3>
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<pre><code data-trim class="asm">
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mov dest, src
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add dest, arg
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cmp reg, arg
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jmp dest
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</code></pre>
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</section>
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<section>
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<h3>Intel registers</h3>
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<ul>
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<li>rax</li>
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<li>rcx</li>
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<li>rdx</li>
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<li>rbx</li>
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<li>rsp</li>
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<li>rbp</li>
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<li>rsi</li>
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<li>rdi</li>
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<li>r8-r15</li>
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</ul>
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</section>
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<section>
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<h3>Intel registers</h3>
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<table class="reg">
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<tr>
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<td colspan="8" class="reg">rax</td>
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</tr>
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<tr>
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<td colspan="4"></td>
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<td colspan="4" class="reg">eax</td>
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</tr>
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<tr>
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<td colspan="6"></td>
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<td colspan="2" class="reg">ax</td>
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</tr>
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<tr>
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<td colspan="6"></td>
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<td colspan="1" class="reg">ah</td>
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<td colspan="1" class="reg">al</td>
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</tr>
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<tr>
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<td>...</td>
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<td>...</td>
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<td>...</td>
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<td>...</td>
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<td>...</td>
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<td>...</td>
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<td>...</td>
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<td>...</td>
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</tr>
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</table>
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</section>
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<section>
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<h3>Intel registers</h3>
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<pre><code data-trim class="cpp">
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union {
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struct {
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uint8_t al;
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uint8_t ah;
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};
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uint16_t ax;
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uint32_t eax;
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uint64_t rax;
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};
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</code></pre>
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</section>
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<section>
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<h3>Cleverness</h3>
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<iframe width="1000px" height="300px"
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src="http://localhost:10240/e#g:!((g:!((g:!((h:codeEditor,i:(fontScale:1.2899450879999999,j:1,source:'int+times9(int+num)+%7B%0A++++return+num+*+9%3B%0A%7D'),l:'5',n:'0',o:'C%2B%2B+source+%231',t:'0')),k:50,l:'4',n:'0',o:'',s:0,t:'0'),(g:!((h:compiler,i:(compiler:/usr/bin/g%2B%2B,filters:(b:'0',commentOnly:'0',directives:'0',intel:'0'),fontScale:1.2899450879999999,options:'-O1',source:1),l:'5',n:'0',o:'/usr/bin/g%2B%2B+(Editor+%231,+Compiler+%231)',t:'0')),k:50,l:'4',n:'0',o:'',s:0,t:'0')),l:'2',n:'0',o:'',t:'0')),version:4"></iframe>
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</section>
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<div class="footer">
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<hr>
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<img src="DRWSmallLogo.png" width="50" height="16">
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<script>
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Reveal.initialize({
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transition: 'none',
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history: true,
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dependencies: [
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{src: 'reveal.js/plugin/markdown/marked.js'},
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{src: 'reveal.js/plugin/markdown/markdown.js'},

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