src/hotspot/cpu/x86/vm_version_x86.cpp

@@ -1163,11 +1163,11 @@
     if (FLAG_IS_DEFAULT(AllocatePrefetchInstr) && supports_3dnow_prefetch()) {
       FLAG_SET_DEFAULT(AllocatePrefetchInstr, 3);
     }
   }
 
-  if( is_amd() ) { // AMD cpus specific settings
+  if( is_amd() || is_hygon() ) { // AMD cpus specific settings
     if( supports_sse2() && FLAG_IS_DEFAULT(UseAddressNop) ) {
       // Use it on new AMD cpus starting from Opteron.
       UseAddressNop = true;
     }
     if( supports_sse2() && FLAG_IS_DEFAULT(UseNewLongLShift) ) {

@@ -1237,12 +1237,12 @@
       // Limit vectors size to 16 bytes on AMD cpus < 17h.
       FLAG_SET_DEFAULT(MaxVectorSize, 16);
     }
 #endif // COMPILER2
 
-    // Some defaults for AMD family 17h
-    if ( cpu_family() == 0x17 ) {
+    // Some defaults for AMD family 17h || Hygon family 18h
+    if ( cpu_family() == 0x17 || cpu_family() == 0x18 ) {
       // On family 17h processors use XMM and UnalignedLoadStores for Array Copy
       if (supports_sse2() && FLAG_IS_DEFAULT(UseXMMForArrayCopy)) {
         FLAG_SET_DEFAULT(UseXMMForArrayCopy, true);
       }
       if (supports_sse2() && FLAG_IS_DEFAULT(UseUnalignedLoadStores)) {