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Merge pull request #5704 from apullin/apullin/abc9-no-loops-fix

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abc9: preserve topological-loop asserts with targeted SCC fallback
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Miodrag Milanović 2026-03-04 11:09:38 +01:00 • committed by GitHub
commit 05d1d56b9d
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3 changed files with 107 additions and 27 deletions
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2
tests/arch/ice40/fsm.ys
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@ -12,5 +12,5 @@ cd fsm # Constrain all select calls below inside the top module
select -assert-count 4 t:SB_DFF
select -assert-count 2 t:SB_DFFESR
select -assert-max 15 t:SB_LUT4
select -assert-max 16 t:SB_LUT4
select -assert-none t:SB_DFFESR t:SB_DFF t:SB_LUT4 %% t:* %D

19
tests/techmap/abc9-nonbox-loop-with-box.ys Normal file
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@ -0,0 +1,19 @@
read_verilog -icells -specify <<EOT
(* abc9_box, blackbox *)
module box1(input i, output o);
specify
(i => o) = 1;
endspecify
endmodule
module top(input i, output o);
wire a, b, c, z;
$_AND_ a0(.A(b), .B(i), .Y(a));
$_AND_ b0(.A(a), .B(c), .Y(b));
$_AND_ c0(.A(b), .B(i), .Y(c));
box1 u_box(.i(i), .o(z));
assign o = c ^ z;
endmodule
EOT
abc9 -lut 4