log: add noop style log

src/main/scala/xiangshan/utils/LogUtils.scala

@@ -28,15 +28,18 @@ object XSLog extends HasXSParameter{
   }
 }
 
-sealed abstract class LogHelper(val logLevel: XSLogLevel) {
+sealed abstract class LogHelper(val logLevel: XSLogLevel) extends HasXSParameter {
 
   def apply(cond: Bool, fmt: String, data: Bits*)(implicit m: Module): Any =
     apply(cond, Printable.pack(fmt, data:_*))
-
   def apply(cond: Bool, pable: Printable)(implicit m: Module): Any = XSLog(logLevel)(cond, pable)
   def apply(fmt: String, data: Bits*)(implicit m: Module): Any =
     apply(true.B, Printable.pack(fmt, data:_*))
   def apply(pable: Printable)(implicit m: Module): Any = XSLog(logLevel)(true.B, pable)
+
+  // Do not use that unless you have valid reasons
+  def apply(cond: Bool = true.B)(body: => Unit): Any =
+    if (logLevel >= LogLevel) { when (cond) { body } }
 }
 
 object XSDebug extends LogHelper(XSLogLevel.DEBUG)