yosys/tests/opt/opt_dff_eqbits.ys

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# small test case
design -reset
read_verilog -sv opt_dff_eqbits_small.sv
hierarchy -top test_case
techmap
opt_dff -sat
synth
opt_dff -sat
opt_clean -purge
select -assert-count 2 t:$_SDFF_PN0_
# equivalence
design -reset
read_verilog -sv opt_dff_eqbits_small.sv
hierarchy -top test_case
prep
design -save gold
opt_dff -sat
design -save gate
design -copy-from gold -as gold test_case
design -copy-from gate -as gate test_case
equiv_make gold gate equiv
equiv_induct equiv
equiv_status -assert
# large test case
design -reset
read_verilog -sv opt_dff_eqbits_large.sv
hierarchy -top test_case
techmap
opt_dff -sat
synth
opt_dff -sat
opt_clean -purge
select -assert-count 6 t:$_SDFFE_PN0P_
# equivalence
design -reset
read_verilog -sv opt_dff_eqbits_large.sv
hierarchy -top test_case
prep
design -save gold
opt_dff -sat
design -save gate
design -copy-from gold -as gold test_case
design -copy-from gate -as gate test_case
equiv_make gold gate equiv
equiv_induct equiv
equiv_status -assert