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https://github.com/YosysHQ/yosys
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fd0e3a2c43
Previously, this wire was handled in the code that populated the "do or do not" techmap cache, resulting in init value removal being performed only for the first use of a given template. Fixes the problem identified in #1396.
109 lines
2.5 KiB
Plaintext
109 lines
2.5 KiB
Plaintext
read_verilog <<EOT
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(* techmap_celltype = "$_DFF_P_" *)
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module ffmap(...);
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input D;
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input C;
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output Q;
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parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
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ffbb #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_(.D(D), .Q(Q), .C(C));
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wire _TECHMAP_FAIL_ = _TECHMAP_WIREINIT_Q_ === 1'b1;
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wire _TECHMAP_REMOVEINIT_Q_ = 1'b1;
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endmodule
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EOT
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design -stash map
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read_verilog <<EOT
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(* techmap_celltype = "$_DFF_P_" *)
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module ffmap(...);
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input D;
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input C;
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output Q;
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parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
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ffbb #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_(.D(D), .Q(Q), .C(C));
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wire _TECHMAP_FAIL_ = _TECHMAP_WIREINIT_Q_ === 1'b1;
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wire _TECHMAP_REMOVEINIT_Q_ = 1'b0;
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endmodule
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EOT
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design -stash map_noremove
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read_verilog <<EOT
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module ffbb (...);
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parameter [0:0] INIT = 1'bx;
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input D, C;
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output Q;
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endmodule
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module top(...);
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input clk;
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input d;
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output reg q0 = 0;
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output reg q1 = 1;
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output reg qq0 = 0;
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output reg qx;
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always @(posedge clk) begin
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q0 <= d;
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q1 <= d;
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qq0 <= q0;
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qx <= d;
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end
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endmodule
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EOT
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design -save ref
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hierarchy -auto-top
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proc
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simplemap
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techmap -map %map
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clean
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# Make sure the parameter was used properly.
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select -assert-count 3 top/t:ffbb
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select -set ff0 top/w:q0 %ci t:ffbb %i
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select -set ffq0 top/w:qq0 %ci t:ffbb %i
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select -set ffx top/w:qx %ci t:ffbb %i
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select -assert-count 1 @ff0
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select -assert-count 1 @ffq0
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select -assert-count 1 @ffx
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select -assert-count 1 @ff0 r:INIT=1'b0 %i
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select -assert-count 1 @ffq0 r:INIT=1'b0 %i
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select -assert-count 1 @ffx r:INIT=1'bx %i
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select -assert-count 0 top/w:q1 %ci t:ffbb %i
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# Make sure the init values are dropped from the wires iff mapping was performed.
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select -assert-count 0 top/w:q0 a:init %i
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select -assert-count 0 top/w:qq0 a:init %i
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select -assert-count 1 top/w:q1 a:init=1'b1 %i
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select -assert-count 0 top/w:qx a:init %i
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design -load ref
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hierarchy -auto-top
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proc
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simplemap
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techmap -map %map_noremove
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clean
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# Make sure the parameter was used properly.
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select -assert-count 3 top/t:ffbb
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select -set ff0 top/w:q0 %ci t:ffbb %i
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select -set ffq0 top/w:qq0 %ci t:ffbb %i
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select -set ffx top/w:qx %ci t:ffbb %i
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select -assert-count 1 @ff0
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select -assert-count 1 @ffq0
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select -assert-count 1 @ffx
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select -assert-count 1 @ff0 r:INIT=1'b0 %i
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select -assert-count 1 @ffq0 r:INIT=1'b0 %i
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select -assert-count 1 @ffx r:INIT=1'bx %i
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select -assert-count 0 top/w:q1 %ci t:ffbb %i
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# Make sure the init values are not dropped from the wires.
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select -assert-count 1 top/w:q0 a:init=1'b0 %i
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select -assert-count 1 top/w:qq0 a:init=1'b0 %i
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select -assert-count 1 top/w:q1 a:init=1'b1 %i
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select -assert-count 0 top/w:qx a:init %i
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