title: Display CFG from llvm in xvcg
body: <p>There is <code>-view-cfg</code> option (<a href="http://llvm.org/docs/Passes.html#view-cfg-view-cfg-of-function" rel="noreferrer">doc</a>) in llvm's <code>opt</code> program, which enables me to view the Control Flow Graph via <code>dot</code> program. But the CFG in too big to be rendered as postscript from dot. I know that there is the <a href="http://directory.fsf.org/wiki/Xvcg" rel="noreferrer"><code>xvcg</code> utiity</a> capable of displaying complex graphs, including CFG (and its <a href="http://pwet.fr/man/linux/commandes/xvcg" rel="noreferrer">man</a> says "VCG tool - visualization of compiler graphs").</p>
  
  <p>So, how can I output llvm's CFG in xvcg format?</p>