MEFreeList: use tailPtr instead of tailPtrNext in free reg cnt

OpenXiangShan · Sep 6, 2021 · e92092e · e92092e
1 parent 31ebfb1
commit e92092e
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/main/scala/xiangshan/backend/rename/freelist/MEFreeList.scala b/src/main/scala/xiangshan/backend/rename/freelist/MEFreeList.scala
@@ -282,7 +282,7 @@ class MEFreeList(implicit val p: config.Parameters) extends MultiIOModule with M
                       Mux(walk, headPtr - PopCount(freeReq.zip(eliminatedMove).map{ case (rq, em) => rq && !em }), 
                       headPtr + PopCount(needAllocatingVec))) // when io.redirect is valid, needAllocatingVec is all-zero
 
-  freeRegCnt := distanceBetween(tailPtrNext, headPtrNext)
+  freeRegCnt := distanceBetween(tailPtr, headPtrNext)
   canAllocate := RegNext(freeRegCnt >= RenameWidth.U)
 
   headPtr := headPtrNext