OpenFPGA/yosys/tests/various/opt_rmdff.ys

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read_verilog -icells opt_rmdff.v
prep
design -stash gold
read_verilog -icells opt_rmdff.v
proc
opt_rmdff
select -assert-count 0 c:remove*
select -assert-min 7 c:keep*
select -assert-count 0 t:$dffe 7:$_DFFE_* %u c:noenable* %i
design -stash gate
design -import gold -as gold
design -import gate -as gate
equiv_make gold gate equiv
hierarchy -top equiv
equiv_simple -undef
equiv_status -assert
design -load gold
stat
design -load gate
stat