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about the tiger book, reducible flow graph, Figure 18.2

Started bypashanhenlei@gmail.com
First post2013-01-19 11:02 -0500
Last post2013-01-19 11:02 -0500
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  about the tiger book, reducible flow graph, Figure 18.2 pashanhenlei@gmail.com - 2013-01-19 11:02 -0500

#845 — about the tiger book, reducible flow graph, Figure 18.2

Frompashanhenlei@gmail.com
Date2013-01-19 11:02 -0500
Subjectabout the tiger book, reducible flow graph, Figure 18.2
Message-ID<13-01-022@comp.compilers>
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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