From bc4339786973778e071e902a912e8637d026d690 Mon Sep 17 00:00:00 2001
From: Alban Gruin <alban.gruin@irit.fr>
Date: Mon, 13 Dec 2021 15:23:37 +0100
Subject: [PATCH] frontend: add a signal to know if a prediction was correct
Signed-off-by: Alban Gruin <alban.gruin@irit.fr>
---
src/frontend/frontend.sv | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/frontend/frontend.sv b/src/frontend/frontend.sv
index f82616f4..e14fe45a 100644
--- a/src/frontend/frontend.sv
+++ b/src/frontend/frontend.sv
@@ -98,7 +98,7 @@ module frontend import ariane_pkg::*; #(
ras_t ras_predict;
// branch-predict update
- logic is_mispredict;
+ logic is_correct_predict, is_mispredict;
logic ras_push, ras_pop;
logic [riscv::VLEN-1:0] ras_update;
@@ -233,6 +233,7 @@ module frontend import ariane_pkg::*; #(
// contains a valid prediction.
for (int i = 0; i < INSTR_PER_FETCH; i++) bp_valid |= ((cf_type[i] != NoCF & cf_type[i] != Return) | ((cf_type[i] == Return) & ras_predict.valid));
end
+ assign is_correct_predict = resolved_branch_i.valid & !(resolved_branch_i.is_mispredict);
assign is_mispredict = resolved_branch_i.valid & resolved_branch_i.is_mispredict;
// Cache interface
--
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