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memory_dff: Fix needlessly duplicating enable bits.

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When the register being merged into the EN signal happens to be a $sdff,
the current code creates a new $mux for every bit, even if they happen
to be identical (as is usually the case), preventing proper grouping
further down the flow.  Fix this by adding a simple cache.

Fixes #2409.
This commit is contained in:
Marcelina Kościelnicka 2020-10-22 10:37:44 +02:00
parent 1a7a597e07
commit eb76d35e80
2 changed files with 32 additions and 0 deletions
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24
tests/arch/ecp5/bug2409.ys Normal file
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read_verilog <<EOT
module t (...);
input CLK;
input [10:0] A;
input WE;
input C;
input [7:0] DI;
output reg [7:0] DO;
reg [7:0] mem[2047:0];
always @(posedge CLK) begin
if (C)
if (WE)
mem[A] <= DI;
DO <= mem[A];
end
endmodule
EOT
synth_ecp5
select -assert-count 1 t:DP16KD