From 1ca430bdde22b1e6008e77baca2d58fb64a66bac Mon Sep 17 00:00:00 2001
From: Alban Gruin <alban.gruin@irit.fr>
Date: Fri, 16 Apr 2021 17:16:43 +0200
Subject: [PATCH] id_stage: add a signal to indicate whether or not there is a
CF
Signed-off-by: Alban Gruin <alban.gruin@irit.fr>
---
src/ariane.sv | 2 ++
src/id_stage.sv | 4 +++-
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/src/ariane.sv b/src/ariane.sv
index b1a75757..7726a772 100644
--- a/src/ariane.sv
+++ b/src/ariane.sv
@@ -95,6 +95,7 @@ module ariane import ariane_pkg::*; #(
// ID -> verifier
// --------------
logic has_mem_access_id_verif;
+ logic has_ctrl_flow_id_icache;
// --------------
// ISSUE -> verifier
@@ -303,6 +304,7 @@ module ariane import ariane_pkg::*; #(
.issue_entry_valid_o ( issue_entry_valid_id_issue ),
.is_ctrl_flow_o ( is_ctrl_fow_id_issue ),
.is_mem_instr_o ( has_mem_access_id_verif ),
+ .has_ctrl_flow_o ( has_ctrl_flow_id_icache ),
.issue_instr_ack_i ( issue_instr_issue_id ),
.priv_lvl_i ( priv_lvl ),
diff --git a/src/id_stage.sv b/src/id_stage.sv
index 7edc74a9..6dd3ff78 100644
--- a/src/id_stage.sv
+++ b/src/id_stage.sv
@@ -38,7 +38,8 @@ module id_stage (
input logic tvm_i,
input logic tw_i,
input logic tsr_i,
- output logic is_mem_instr_o
+ output logic is_mem_instr_o,
+ output logic has_ctrl_flow_o // speculative CF (ie. no jals)
);
// ID/ISSUE register stage
struct packed {
@@ -96,6 +97,7 @@ module id_stage (
assign issue_entry_o = issue_q.sbe;
assign issue_entry_valid_o = issue_q.valid;
assign is_ctrl_flow_o = issue_q.is_ctrl_flow;
+ assign has_ctrl_flow_o = issue_q.valid && issue_q.is_ctrl_flow && issue_q.sbe.op != ariane_pkg::ADD;
assign is_mem_instr_o = is_mem_instr_q;
--
GitLab