From bf08c57ab077eedf661cc7fe3afba8604a8e32f7 Mon Sep 17 00:00:00 2001
From: Ross Thompson <ross1728@gmail.com>
Date: Sat, 7 Jan 2023 13:16:57 -0600
Subject: [PATCH] Added branch outcome logger to testbench

---
 pipelined/testbench/testbench.sv | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/pipelined/testbench/testbench.sv b/pipelined/testbench/testbench.sv
index f663421b..71f1806a 100644
--- a/pipelined/testbench/testbench.sv
+++ b/pipelined/testbench/testbench.sv
@@ -33,6 +33,7 @@
 `include "tests.vh"
 
 `define PrintHPMCounters 0
+`define BPRED_LOGGER 1
 
 module testbench;
   parameter DEBUG=0;
@@ -475,6 +476,19 @@ logic [3:0] dummy;
         release dut.core.ifu.bpred.bpred.TargetPredictor.memory.mem[adrindex];
         end
       end
+
+      if (`BPRED_LOGGER) begin
+        string direction;
+        int    file;
+        initial
+          file = $fopen("branch.log", "w");
+        always @(posedge clk) begin
+           if(dut.core.ifu.InstrClassM[0] & ~dut.core.StallW & ~dut.core.FlushW & dut.core.InstrValidM) begin
+             direction = dut.core.ifu.bpred.bpred.Predictor.DirPredictor.PCSrcM ? "t" : "n";
+             $fwrite(file, "%h %s\n", dut.core.PCM, direction);
+           end
+        end
+      end
     end
 
   // check for hange up.