about the tiger book, reducible flow graph, Figure 18.2

pashanhenlei@gmail.com
Sat, 19 Jan 2013 11:02:24 -0500 (EST)

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about the tiger book, reducible flow graph, Figure 18.2 pashanhenlei@gmail.com (2013-01-19)
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From: pashanhenlei@gmail.com
Newsgroups: comp.compilers
Date: Sat, 19 Jan 2013 11:02:24 -0500 (EST)
Organization: Compilers Central
Keywords: books, question, optimize
Posted-Date: 19 Jan 2013 11:02:24 EST

i have a question: when we reduce Figure 18.2c to Figure 18.2a, why
should we first remove edge 6->9 and edge 5->4? i can't figure out the
rules behind.


can anyone help me? TIA.


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