BPU: stage1 ready when flush

src/main/scala/xiangshan/frontend/BPU.scala

@@ -175,7 +175,7 @@ class BPUStage1 extends BPUStage {
   when (io.flush || inFire) { predValid := true.B }
   .elsewhen(outFire)        { predValid := false.B }
   .otherwise                { predValid := predValid }
-  io.in.ready := !predValid || io.out.fire() && io.pred.fire()
+  io.in.ready := !predValid || io.out.fire() && io.pred.fire() || io.flush
   io.out.valid := predValid
 
   // ubtb is accessed with inLatch pc in s1,