1263   //
1264   // return true if opcode is one of the possible CompareAndSwapX
1265   // values otherwise false.
1266 
1267   bool is_CAS(int opcode, bool maybe_volatile)
1268   {
1269     switch(opcode) {
1270       // We handle these
1271     case Op_CompareAndSwapI:
1272     case Op_CompareAndSwapL:
1273     case Op_CompareAndSwapP:
1274     case Op_CompareAndSwapN:
1275     case Op_CompareAndSwapB:
1276     case Op_CompareAndSwapS:
1277     case Op_GetAndSetI:
1278     case Op_GetAndSetL:
1279     case Op_GetAndSetP:
1280     case Op_GetAndSetN:
1281     case Op_GetAndAddI:
1282     case Op_GetAndAddL:




1283       return true;
1284     case Op_CompareAndExchangeI:
1285     case Op_CompareAndExchangeN:
1286     case Op_CompareAndExchangeB:
1287     case Op_CompareAndExchangeS:
1288     case Op_CompareAndExchangeL:
1289     case Op_CompareAndExchangeP:
1290     case Op_WeakCompareAndSwapB:
1291     case Op_WeakCompareAndSwapS:
1292     case Op_WeakCompareAndSwapI:
1293     case Op_WeakCompareAndSwapL:
1294     case Op_WeakCompareAndSwapP:
1295     case Op_WeakCompareAndSwapN:
1296       return maybe_volatile;
1297     default:
1298       return false;
1299     }
1300   }
1301 
1302   // helper to determine the maximum number of Phi nodes we may need to

1263   //
1264   // return true if opcode is one of the possible CompareAndSwapX
1265   // values otherwise false.
1266 
1267   bool is_CAS(int opcode, bool maybe_volatile)
1268   {
1269     switch(opcode) {
1270       // We handle these
1271     case Op_CompareAndSwapI:
1272     case Op_CompareAndSwapL:
1273     case Op_CompareAndSwapP:
1274     case Op_CompareAndSwapN:
1275     case Op_CompareAndSwapB:
1276     case Op_CompareAndSwapS:
1277     case Op_GetAndSetI:
1278     case Op_GetAndSetL:
1279     case Op_GetAndSetP:
1280     case Op_GetAndSetN:
1281     case Op_GetAndAddI:
1282     case Op_GetAndAddL:
1283 #if INCLUDE_SHENANDOAHGC
1284     case Op_ShenandoahCompareAndSwapP:
1285     case Op_ShenandoahCompareAndSwapN:
1286 #endif
1287       return true;
1288     case Op_CompareAndExchangeI:
1289     case Op_CompareAndExchangeN:
1290     case Op_CompareAndExchangeB:
1291     case Op_CompareAndExchangeS:
1292     case Op_CompareAndExchangeL:
1293     case Op_CompareAndExchangeP:
1294     case Op_WeakCompareAndSwapB:
1295     case Op_WeakCompareAndSwapS:
1296     case Op_WeakCompareAndSwapI:
1297     case Op_WeakCompareAndSwapL:
1298     case Op_WeakCompareAndSwapP:
1299     case Op_WeakCompareAndSwapN:
1300       return maybe_volatile;
1301     default:
1302       return false;
1303     }
1304   }
1305 
1306   // helper to determine the maximum number of Phi nodes we may need to