yosys/tests/various/mem2reg.ys

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read_verilog <<EOT
module top;
parameter DATADEPTH=2;
parameter DATAWIDTH=1;
(* keep, nomem2reg *) reg [DATAWIDTH-1:0] data1 [DATADEPTH-1:0];
(* keep, mem2reg *) reg [DATAWIDTH-1:0] data2 [DATADEPTH-1:0];
endmodule
EOT
proc
cd top
select -assert-count 1 m:data1 a:src=<<EOT:4.43-4.48 %i
select -assert-count 2 w:data2[*] a:src=<<EOT:5.41-5.46 %i
select -assert-none a:mem2reg