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#start: passes in the following order:
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#end: When called with -fast
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opt_expr
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opt_merge -nomux
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do
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opt_muxtree
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opt_reduce
|
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opt_merge
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opt_share (-full only)
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opt_dff (except when called with -noff)
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opt_hier (-hier only)
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opt_clean
|
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opt_expr
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while <changed design>
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