yosys/tests/arch/xilinx/latches.ys

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read_verilog latches.v
design -save read
hierarchy -top latchp
proc
equiv_opt -async2sync -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
cd latchp # Constrain all select calls below inside the top module
select -assert-count 1 t:LDCE
select -assert-none t:LDCE %% t:* %D
design -load read
hierarchy -top latchn
proc
equiv_opt -async2sync -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
cd latchn # Constrain all select calls below inside the top module
select -assert-count 1 t:LDCE
select -assert-count 1 t:LUT1
select -assert-none t:LDCE t:LUT1 %% t:* %D
design -load read
hierarchy -top latchsr
proc
equiv_opt -async2sync -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
cd latchsr # Constrain all select calls below inside the top module
select -assert-count 1 t:LDCE
select -assert-count 2 t:LUT3
select -assert-none t:LDCE t:LUT3 %% t:* %D