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Add new helper class for merging FFs into cells, use for memory_dff.

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Fixes #1854.
This commit is contained in:
Marcelina Kościelnicka 2021-03-15 15:38:45 +01:00
parent a23d9409e7
commit 1eea06bcc0
7 changed files with 600 additions and 244 deletions
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17
tests/opt/bug1854.ys Normal file
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read_verilog << EOT
module top(input clk, input [3:0] addr, output reg [0:0] dout);
reg [1:0] mem[0:15];
initial begin
mem[0] = 2'b00;
mem[1] = 2'b01;
mem[2] = 2'b10;
mem[3] = 2'b11;
end
always @(posedge clk)
dout <= mem[addr];
endmodule
EOT
prep -rdff
select -assert-none t:$dff