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Start opt_hier

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Martin Povišer 2025-07-03 11:23:30 +02:00
parent 99f7d79abb
commit 22a44e4333
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tests/opt/opt_hier_test1.v Normal file
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(* blackbox *)
module bb(output y);
endmodule
// all instances of `m` tie together a[1], a[2]
// this can be used to conclude y[0]=0
module m(input [3:0] a, output [1:0] y, output x);
assign y[0] = a[1] != a[2];
assign x = a[0] ^ a[3];
(* should_get_optimized_out *)
bb bb1(.y(y[1]));
endmodule
module top(input j, output z, output [2:0] x);
wire [1:0] y1;
wire [1:0] y2;
wire [1:0] y3;
m inst1(.a(0), .y(y1), .x(x[0]));
m inst2(.a(15), .y(y2), .x(x[1]));
m inst3(.a({1'b1, j, j, 1'b0}), .y(y3), .x(x[2]));
assign z = (&y1) ^ (&y2) ^ (&y3);
endmodule