yosys/tests/arch/xilinx/shifter.ys

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read_verilog ../common/shifter.v
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hierarchy -top top
proc
flatten
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equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
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design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
cd top # Constrain all select calls below inside the top module
select -assert-count 1 t:BUFG
select -assert-count 8 t:FDRE
select -assert-none t:BUFG t:FDRE %% t:* %D