fix(FTB): Turn off FTB updates when FTB is closed.

OpenXiangShan · Sep 11, 2024 · f3984f3 · f3984f3
1 parent 69652e6
commit f3984f3
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/main/scala/xiangshan/frontend/FTB.scala b/src/main/scala/xiangshan/frontend/FTB.scala
@@ -754,7 +754,7 @@ class FTB(implicit p: Parameters) extends BasePredictor with FTBParams with BPUU
   val update = io.update.bits
 
   val u_meta = update.meta.asTypeOf(new FTBMeta)
-  val u_valid = io.update.valid && !io.update.bits.old_entry
+  val u_valid = io.update.valid && !io.update.bits.old_entry && !s2_close_ftb_req
 
   val (_, delay2_pc) = DelayNWithValid(update.pc, u_valid, 2)
   val (_, delay2_entry) = DelayNWithValid(update.ftb_entry, u_valid, 2)
@@ -807,6 +807,7 @@ class FTB(implicit p: Parameters) extends BasePredictor with FTBParams with BPUU
   XSPerfAccumulate("ftb_update_req", io.update.valid)
   XSPerfAccumulate("ftb_update_ignored", io.update.valid && io.update.bits.old_entry)
   XSPerfAccumulate("ftb_updated", u_valid)
+  XSPerfAccumulate("ftb_closing_update_counter", s2_close_ftb_req && u_valid)
 
   override val perfEvents = Seq(
     ("ftb_commit_hits            ", io.update.valid  &&  u_meta.hit),