93 lines
2.5 KiB
Systemverilog
93 lines
2.5 KiB
Systemverilog
// DESCRIPTION: Verilator: Verilog Test module
|
|
//
|
|
// This file ONLY is placed under the Creative Commons Public Domain, for
|
|
// any use, without warranty, 2025 by Wilson Snyder.
|
|
// SPDX-License-Identifier: CC0-1.0
|
|
|
|
`define stop $stop
|
|
`define checks(gotv,expv) do if ((gotv) != (expv)) begin $write("%%Error: %s:%0d: got='%s' exp='%s'\n", `__FILE__,`__LINE__, (gotv), (expv)); `stop; end while(0);
|
|
|
|
module sub (
|
|
input wire clock_4,
|
|
input wire clock_8,
|
|
output wire [28:5] out63
|
|
);
|
|
|
|
reg [28:0] reg_12;
|
|
reg [28:22] reg_24;
|
|
|
|
wire _0558_ = | reg_24[26:25]; // reg_24 = 0 or 1100110 ---> _0558_ == 0
|
|
wire [28:0] _0670_ = _0558_ ? reg_12 : 29'h00000f93; // _0558_ == 0 ---> _0670_ == 29'h00000f93
|
|
wire [28:0] _0399_= - _0670_; // _0670_ == 29'h00000f93 ---> _0399_ = 29'b11111111111111111000001101101
|
|
wire _0085_ = ~ _0399_[2]; // _0399_[2] == 1 ---> _0085_ == 0
|
|
wire [28:0] _0769_;
|
|
assign { _0769_[28:3], _0769_[1:0] } = { _0399_[28:3], _0399_[1:0] }; // _0769_ != 0
|
|
assign _0769_[2] = _0085_;
|
|
|
|
// verilator lint_off WIDTH
|
|
wire _0305_ = ! _0769_; // _0769_ != 0 ---> _0305_ == 0
|
|
wire [23:0] _0306_ = ! _0305_; // _0305_ == 0 ---> _0306_ == 1
|
|
// verilator lint_on WIDTH
|
|
|
|
assign out63 = _0306_; // out63 == 1
|
|
|
|
always @(posedge clock_4, posedge clock_8)
|
|
if (clock_8) reg_12 <= 29'h00000066;
|
|
else reg_12 <= { reg_12[28:27], 25'h0000001, reg_12[1:0] };
|
|
|
|
always @(posedge clock_4, posedge clock_8)
|
|
if (clock_8) reg_24 <= 7'h66;
|
|
else reg_24 <= reg_24;
|
|
|
|
endmodule
|
|
|
|
module t;
|
|
reg clock_4;
|
|
reg clock_8;
|
|
wire signed [28:5] out63;
|
|
reg signed [7:0] tmp = -1;
|
|
reg signed [0:0] one = 1;
|
|
reg signed [0:0] onert = 1;
|
|
|
|
sub sub (
|
|
.clock_4 (clock_4),
|
|
.clock_8 (clock_8),
|
|
.out63 (out63)
|
|
);
|
|
|
|
|
|
initial begin
|
|
// All simulators agree: 1'sb1 really shows as decimal -1
|
|
$display("one 'd=%d 'b=%b", one, one);
|
|
`ifdef VERILATOR
|
|
onert = $c(1);
|
|
`endif
|
|
$display("ort 'd=%d 'b=%b", onert, onert);
|
|
|
|
$display("tmp 'd=%d 'b=%b", tmp, tmp);
|
|
|
|
clock_4 = 0;
|
|
clock_8 = 0;
|
|
#2000;
|
|
|
|
sub.reg_24 = 0;
|
|
sub.reg_12 = 0;
|
|
#2000;
|
|
|
|
clock_4 = 0;
|
|
clock_8 = 0;
|
|
#10;
|
|
$display("out63 'd=%d 'b=%b", out63, out63);
|
|
|
|
#2000;
|
|
clock_4 = 1;
|
|
clock_8 = 1;
|
|
#10;
|
|
$display("out63 'd=%d 'b=%b", out63, out63);
|
|
|
|
$write("*-* All Finished *-*\n");
|
|
$finish;
|
|
end
|
|
|
|
endmodule
|