title: SAR command in X86 assembly with one parameter
body: <p>In a disassembled program I'm analyzing, I found the command</p>
  
  <pre><code>sar %eax
  </code></pre>
  
  <p>What does this do? I know that <code>sar</code> with two arguments performs a right shift, but I can't find what it means with only one parameter.</p>
  
  <p>This program was compiled for an Intel x86 processor.</p>