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  <author_name>phoenix_hiro</author_name>
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  <blog_title>雑記</blog_title>
  <blog_url>https://phoenix-hiro.hatenadiary.org/</blog_url>
  <categories>
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  <description>主にやってたのこれなのですが、結構いろいろあって、コンパイラ屋さん大変だなぁ、と思ったりしてました（小並感）。 4種類ほど紹介します。 自明な bit 演算 (and 0 A) -&gt; 0, (and 0xFFFFFFFFFFFFFFFF A) -&gt; A, (and A A) -&gt; A, (xor A A) -&gt; 0, (and (not A) A) -&gt; 0, (or (not A) A) -&gt; 0xFFFFFFFFFFFFFFFF, (not (not A)) -&gt; A, (not (or (not A) B) -&gt; (or A B), (xor (not A) (not B)) -&gt; (x…</description>
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  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2013-08-12 02:38:21</published>
  <title>式のつぶし方</title>
  <type>rich</type>
  <url>https://phoenix-hiro.hatenadiary.org/entry/20130812/1376329101</url>
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