From 63cd024d5c4d3b74ba674a5f20d7effe0a633eae Mon Sep 17 00:00:00 2001
From: Graham Edgecombe <gpe@grahamedgecombe.com>
Date: Fri, 29 Dec 2017 16:23:33 +0000
Subject: [PATCH] Fix instret rollover

---
 rv32_csrs.sv | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rv32_csrs.sv b/rv32_csrs.sv
index 1b190d0..dec4d21 100644
--- a/rv32_csrs.sv
+++ b/rv32_csrs.sv
@@ -65,7 +65,7 @@ module rv32_csrs (
         cycleh <= cycleh + &cycle;
         cycle <= cycle + 1;
 
-        instreth <= instreth + &instret;
+        instreth <= instreth + (&instret && instr_retired_in);
         instret <= instret + instr_retired_in;
     end
 endmodule