about the tiger book, reducible flow graph, Figure 18.2

From	pashanhenlei@gmail.com
Newsgroups	comp.compilers
Subject	about the tiger book, reducible flow graph, Figure 18.2
Date	2013-01-19 11:02 -0500
Organization	Compilers Central
Message-ID	<13-01-022@comp.compilers> (permalink)

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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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about the tiger book, reducible flow graph, Figure 18.2 pashanhenlei@gmail.com - 2013-01-19 11:02 -0500

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