Vortex 2.0 changes:

+ Microarchitecture optimizations
+ 64-bit support
+ Xilinx FPGA support
+ LLVM-16 support
+ Refactoring and quality control fixes

hw/rtl/libs/VX_reset_relay.sv

@@ -1,31 +1,43 @@
+// Copyright © 2019-2023
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 `include "VX_platform.vh"
 
+`TRACING_OFF
 module VX_reset_relay #(
-    parameter N     = 1,
-    parameter DEPTH = 1
+    parameter N          = 1,
+    parameter MAX_FANOUT = 0
 ) (
-    input wire  clk,
-    input wire  reset,
+    input wire          clk,
+    input wire          reset,
     output wire [N-1:0] reset_o
-); 
-    
-    if (DEPTH > 1) begin
-        `PRESERVE_REG `DISABLE_BRAM reg [N-1:0] reset_r [DEPTH-1:0];
-        always @(posedge clk) begin
-            for (integer i = DEPTH-1; i > 0; --i)
-                reset_r[i] <= reset_r[i-1];
-            reset_r[0] <= {N{reset}};
-        end       
-        assign reset_o = reset_r[DEPTH-1];
-    end else if (DEPTH == 1) begin
-        `PRESERVE_REG reg [N-1:0] reset_r;
-        always @(posedge clk) begin
-            reset_r <= {N{reset}};
+);    
+    if (MAX_FANOUT >= 0 && N > (MAX_FANOUT + MAX_FANOUT/2)) begin
+        localparam F = `UP(MAX_FANOUT);
+        localparam R = N / F;
+        `PRESERVE_NET reg [R-1:0] reset_r;
+        for (genvar i = 0; i < R; ++i) begin
+            always @(posedge clk) begin
+                reset_r[i] <= reset;
+            end
+        end
+        for (genvar i = 0; i < N; ++i) begin
+            assign reset_o[i] = reset_r[i / F];
         end
-        assign reset_o = reset_r;
     end else begin
         `UNUSED_VAR (clk)
         assign reset_o = {N{reset}};
     end
   
-endmodule
+endmodule
+`TRACING_ON