From dedc08bd42ace2af716702020b7fc6ea2fcaecca Mon Sep 17 00:00:00 2001
From: Ross Thompson <ross1728@gmail.com>
Date: Mon, 19 Dec 2022 23:33:12 -0600
Subject: [PATCH] several options for pcnextf on fence.i

---
 pipelined/src/ifu/bpred.sv | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pipelined/src/ifu/bpred.sv b/pipelined/src/ifu/bpred.sv
index 0cc33f7b..87d7557b 100644
--- a/pipelined/src/ifu/bpred.sv
+++ b/pipelined/src/ifu/bpred.sv
@@ -269,8 +269,14 @@ module bpred
 
   mux2 #(`XLEN) pccorrectemux(.d0(PCLinkE), .d1(IEUAdrE), .s(PCSrcE), .y(PCCorrectE));
   // If the fence/csrw was predicted as a taken branch then we select PCF, rather PCE.
-  // could also just use PCM+4
+  // could also just use PCM+4, which should be pclinke
   mux2 #(`XLEN) pcmuxBPWrongInvalidateFlush(.d0(PCE), .d1(PCF), .s(BPPredWrongM), .y(NextValidPCE));
+  //logic [`XLEN-1:0] PCLinkM;
+  //flopenr #(`XLEN) PCPEReg(clk, reset, ~StallM, PCLinkE, PCLinkM);
+  //assign NextValidPCE = PCLinkM;
+  // of the three, the mux is the cheapest, but the least clear.
+  // this could move entirely into ifu with no relation to bp with the third.
+  
   //assign NextValidPCE = PCE;