From 56a24d02e8f6d12989d17b6a9c36188cc24651cc Mon Sep 17 00:00:00 2001
From: Ross Thompson <ross1728@gmail.com>
Date: Wed, 25 Jan 2023 15:16:53 -0600
Subject: [PATCH] Fixed subtle bug in btb.
---
pipelined/src/ifu/brpred/bpred.sv | 1 -
pipelined/src/ifu/brpred/btb.sv | 5 ++---
2 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/pipelined/src/ifu/brpred/bpred.sv b/pipelined/src/ifu/brpred/bpred.sv
index dd7b9e850..485875b66 100644
--- a/pipelined/src/ifu/brpred/bpred.sv
+++ b/pipelined/src/ifu/brpred/bpred.sv
@@ -146,7 +146,6 @@ module bpred (
.UpdateEN(|InstrClassE | PredictionInstrClassWrongE),
.PCE,
.IEUAdrE,
- .UpdateInvalid(PredictionInstrClassWrongE),
.InstrClassE);
// Part 3 RAS
diff --git a/pipelined/src/ifu/brpred/btb.sv b/pipelined/src/ifu/brpred/btb.sv
index bcf5dcfd9..aba3826b3 100644
--- a/pipelined/src/ifu/brpred/btb.sv
+++ b/pipelined/src/ifu/brpred/btb.sv
@@ -44,8 +44,7 @@ module btb
input logic UpdateEN,
input logic [`XLEN-1:0] PCE,
input logic [`XLEN-1:0] IEUAdrE,
- input logic [3:0] InstrClassE,
- input logic UpdateInvalid
+ input logic [3:0] InstrClassE
);
localparam TotalDepth = 2 ** Depth;
@@ -92,7 +91,7 @@ module btb
if (reset) begin
ValidBits <= #1 {TotalDepth{1'b0}};
end else if (UpdateEN & ~StallM & ~FlushM) begin
- ValidBits[PCEIndex] <= #1 ~ UpdateInvalid;
+ ValidBits[PCEIndex] <= #1 |InstrClassE;
end
PredValidF = ValidBits[PCNextFIndex];
end