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dfflibmap: cover enable inference with test #4807

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merged 1 commit into from
Dec 10, 2024
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dfflibmap: cover enable inference with test #4807

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9 changes: 9 additions & 0 deletions tests/techmap/dfflibmap-sim.v
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Original file line number Diff line number Diff line change
Expand Up @@ -20,3 +20,12 @@ always @(posedge CLK, posedge CLEAR, posedge PRESET)
assign QN = ~Q;

endmodule

module dffe(input CLK, EN, D, output reg Q, output QN);

always @(negedge CLK)
if (EN) Q <= D;

assign QN = ~Q;

endmodule
32 changes: 28 additions & 4 deletions tests/techmap/dfflibmap.lib
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@ library(test) {
ff("IQ", "IQN") {
next_state : "D";
clocked_on : "!CLK";
}
}
pin(D) {
direction : input;
}
Expand All @@ -19,7 +19,7 @@ library(test) {
pin(QN) {
direction: output;
function : "IQN";
}
}
}
cell (dffsr) {
area : 6;
Expand All @@ -30,7 +30,7 @@ library(test) {
preset : "PRESET";
clear_preset_var1 : L;
clear_preset_var2 : L;
}
}
pin(D) {
direction : input;
}
Expand All @@ -50,6 +50,30 @@ library(test) {
pin(QN) {
direction: output;
function : "IQN";
}
}
}
cell (dffe) {
area : 6;
ff("IQ", "IQN") {
next_state : "(D&EN) | (IQ&!EN)";
clocked_on : "!CLK";
}
pin(D) {
direction : input;
}
pin(EN) {
direction : input;
}
pin(CLK) {
direction : input;
}
pin(Q) {
direction: output;
function : "IQ";
}
pin(QN) {
direction: output;
function : "IQN";
}
}
}
23 changes: 14 additions & 9 deletions tests/techmap/dfflibmap.ys
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Original file line number Diff line number Diff line change
@@ -1,14 +1,15 @@
read_verilog -icells <<EOT

module top(input C, D, S, R, output [9:0] Q);
module top(input C, D, E, S, R, output [11:0] Q);

$_DFF_P_ ff0 (.C(C), .D(D), .Q(Q[0]));
$_DFF_PP0_ ff1 (.C(C), .D(D), .R(R), .Q(Q[1]));
$_DFF_PP1_ ff2 (.C(C), .D(D), .R(R), .Q(Q[2]));
$_DFFSR_PPP_ ff3 (.C(C), .D(D), .R(R), .S(S), .Q(Q[3]));
$_DFFSR_NNN_ ff4 (.C(C), .D(D), .R(R), .S(S), .Q(Q[4]));
$_DFFE_PP_ ff5 (.C(C), .D(D), .E(E), .Q(Q[5]));

assign Q[9:5] = ~Q[4:0];
assign Q[11:6] = ~Q[5:0];

endmodule

Expand All @@ -29,23 +30,25 @@ design -load orig
dfflibmap -liberty dfflibmap.lib
clean

select -assert-count 4 t:$_NOT_
select -assert-count 5 t:$_NOT_
select -assert-count 1 t:dffn
select -assert-count 4 t:dffsr
select -assert-none t:dffn t:dffsr t:$_NOT_ %% %n t:* %i
select -assert-count 1 t:dffe
select -assert-none t:dffn t:dffsr t:dffe t:$_NOT_ %% %n t:* %i

design -load orig
dfflibmap -prepare -liberty dfflibmap.lib

select -assert-count 9 t:$_NOT_
select -assert-count 11 t:$_NOT_
select -assert-count 1 t:$_DFF_N_
select -assert-count 4 t:$_DFFSR_PPP_
select -assert-none t:$_DFF_N_ t:$_DFFSR_PPP_ t:$_NOT_ %% %n t:* %i
select -assert-count 1 t:$_DFFE_NP_
select -assert-none t:$_DFF_N_ t:$_DFFSR_PPP_ t:$_DFFE_NP_ t:$_NOT_ %% %n t:* %i

design -load orig
dfflibmap -map-only -liberty dfflibmap.lib

select -assert-count 5 t:$_NOT_
select -assert-count 6 t:$_NOT_
select -assert-count 0 t:dffn
select -assert-count 1 t:dffsr

Expand All @@ -54,14 +57,16 @@ dfflibmap -prepare -liberty dfflibmap.lib
dfflibmap -map-only -liberty dfflibmap.lib
clean

select -assert-count 4 t:$_NOT_
select -assert-count 5 t:$_NOT_
select -assert-count 1 t:dffn
select -assert-count 4 t:dffsr
select -assert-none t:dffn t:dffsr t:$_NOT_ %% %n t:* %i
select -assert-count 1 t:dffe
select -assert-none t:dffn t:dffsr t:dffe t:$_NOT_ %% %n t:* %i

design -load orig
dfflibmap -liberty dfflibmap.lib -dont_use *ffn
clean

select -assert-count 0 t:dffn
select -assert-count 5 t:dffsr
select -assert-count 1 t:dffe
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