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https://github.com/verilator/verilator.git
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Geza Lore
a8dca71ed0
Previously DFG was limited to having a Sel, or an ArraySel potentially under a Concat on the LHS of combinational assignments. Other forms or combinations were not representable in the graph. This adds support for arbitrary combinations of the above by combining DfgSplicePacked and DfgSpliceArray vertices introduced in #6176. In particular, Sel(ArraySel(VarRef,_),_) enables a lot more code to be represented in DFG.
97 lines
2.5 KiB
Systemverilog
97 lines
2.5 KiB
Systemverilog
// DESCRIPTION: Verilator: Verilog Test module
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//
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// This file ONLY is placed into the Public Domain, for any use,
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// without warranty, 2011 by Jeremy Bennett.
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// SPDX-License-Identifier: CC0-1.0
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module t (/*AUTOARG*/
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// Inputs
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clk
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);
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input clk;
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// verilator lint_off MULTIDRIVEN
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wire [19:10] bitout;
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// verilator lint_on MULTIDRIVEN
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wire [29:24] short_bitout;
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wire [7:0] allbits;
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wire [15:0] twobits;
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sub
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i_sub1 [7:4] (.allbits (allbits),
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.twobits (twobits[15:8]),
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.bitout (bitout[17:14])),
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i_sub2 [3:0] (.allbits (allbits),
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.twobits (twobits[7:0]),
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.bitout (bitout[13:10]));
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sub
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i_sub3 [7:4] (.allbits (allbits),
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.twobits (twobits[15:8]),
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.bitout (bitout[17:14]));
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sub
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i_sub4 [7:4] (.allbits (allbits),
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.twobits (twobits[15:8]),
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.bitout (short_bitout[27:24]));
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sub
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i_sub5 [7:0] (.allbits (allbits),
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.twobits (twobits),
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.bitout (bitout[17:10]));
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sub
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i_sub6 [7:4] (.allbits (allbits),
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.twobits (twobits[15:8]),
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.bitout ({bitout[18+:2],short_bitout[28+:2]}));
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integer cyc = 0;
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reg [63:0] crc;
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reg [63:0] sum;
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// Signals under test
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assign allbits = crc[7:0];
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assign twobits = crc[15:0];
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wire [63:0] result = {48'h0, short_bitout, bitout};
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// Test loop
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always @ (posedge clk) begin
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`ifdef TEST_VERBOSE
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$write("[%0t] cyc==%0d crc=%x result=%x\n", $time, cyc, crc, result);
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`endif
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cyc <= cyc + 1;
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crc <= {crc[62:0], crc[63] ^ crc[2] ^ crc[0]};
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sum <= result ^ {sum[62:0], sum[63] ^ sum[2] ^ sum[0]};
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if (cyc==0) begin
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// Setup
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crc <= 64'h5aef0c8d_d70a4497;
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sum <= 64'h0;
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end
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else if (cyc<10) begin
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sum <= 64'h0;
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end
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else if (cyc<90) begin
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end
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else if (cyc==99) begin
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$write("[%0t] cyc==%0d crc=%x sum=%x\n", $time, cyc, crc, sum);
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if (crc !== 64'hc77bb9b3784ea091) $stop;
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// What checksum will we end up with (above print should match)
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`define EXPECTED_SUM 64'ha1da9ff8082a4ff6
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if (sum !== `EXPECTED_SUM) $stop;
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$write("*-* All Finished *-*\n");
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$finish;
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end
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end
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endmodule // t
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module sub
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( input wire [7:0] allbits,
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input wire [1:0] twobits,
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output wire bitout);
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assign bitout = (^ twobits) ^ (^ allbits);
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endmodule // sub
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