Index: lib/Target/AArch64/AArch64Subtarget.cpp
===================================================================
--- lib/Target/AArch64/AArch64Subtarget.cpp
+++ lib/Target/AArch64/AArch64Subtarget.cpp
@@ -84,6 +84,28 @@
   case Vulcan:
     MaxInterleaveFactor = 4;
     break;
+  case ThunderX:
+    CacheLineSize = 128;
+    MaxPrefetchIterationsAhead = 8;
+    HasLSE = true;
+    PrefFunctionAlignment = 4;
+    PrefLoopAlignment = 4;
+    break;
+  case ThunderXT88:
+    CacheLineSize = 128;
+    HasLSE = true;
+    PrefFunctionAlignment = 4;
+    PrefLoopAlignment = 4;
+    break;
+  case ThunderXT81:
+  case ThunderXT83:
+    CacheLineSize = 128;
+    MaxPrefetchIterationsAhead = 16;
+    HasLSE = true;
+    HasV8_1aOps = true;
+    PrefFunctionAlignment = 4;
+    PrefLoopAlignment = 4;
+    break;
   case CortexA35: break;
   case CortexA53: break;
   case CortexA72: break;