yosys/docs/source/code_examples/macro_commands/opt.ys

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