DJ graphs

algrant@myrealbox.com (Al Grant)
25 Jan 2003 01:11:54 -0500

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DJ graphs algrant@myrealbox.com (2003-01-25)
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From: algrant@myrealbox.com (Al Grant)
Newsgroups: comp.compilers
Date: 25 Jan 2003 01:11:54 -0500
Organization: http://groups.google.com/
Keywords: analysis, question
Posted-Date: 25 Jan 2003 01:11:54 EST

I have a question about DJ graphs. AIUI it is the dominance tree
(D edges) plus J edges for any CFG arcs which aren't already in the
dominance tree. But how does this distinguish


      A A
    / \ /|\
  B C and B | C
    \ / \|/
      D D


The DJ graph of #1 is the dominance tree plus J edges B-D and C-D. In
particular there is a D edge A-D. The constructions I've seen would
produce the same graph for #2. Surely that can't be right?

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