parameter: enable ghist diff and use optimized tage hist config

src/main/scala/xiangshan/Parameters.scala

@@ -63,7 +63,7 @@ case class XSCoreParameters
   EnableUBTB: Boolean = true,
   UbtbGHRLength: Int = 4,
   HistoryLength: Int = 512,
-  EnableGHistDiff: Boolean = false,
+  EnableGHistDiff: Boolean = true,
   UbtbSize: Int = 256,
   FtbSize: Int = 2048,
   RasSize: Int = 32,
@@ -72,12 +72,12 @@ case class XSCoreParameters
   TageTableInfos: Seq[Tuple3[Int,Int,Int]] =
   //       Sets  Hist   Tag
     Seq(( 2048,    2,    8),
-        ( 2048,    8,    8),
-        ( 2048,   12,    8),
+        ( 2048,    9,    8),
         ( 2048,   13,    8),
-        ( 2048,   27,    8),
-        ( 2048,   54,    8),
-        ( 2048,  119,    8),
+        ( 2048,   17,    8),
+        ( 2048,   30,    8),
+        ( 2048,   44,    8),
+        ( 2048,   73,    8),
         ( 2048,  256,    8)),
     // Seq(( 4096,    8,    8),
     //     ( 4096,   13,    8),