src/hotspot/share/runtime/globals.hpp

*** 906,915 ****
--- 906,936 ----
            "Allocate nonstatic fields in gaps between previous fields")      \
                                                                              \
    notproduct(bool, PrintFieldLayout, false,                                 \
            "Print field layout for each class")                              \
                                                                              \
+   notproduct(bool, PrintValueLayout, false,                                 \
+           "Print field layout for each value type")                         \
+                                                                             \
+   notproduct(bool, PrintValueArrayLayout, false,                            \
+           "Print array layout for each value type array")                   \
+                                                                             \
+   product(bool, ValueArrayFlatten, true,                                    \
+           "Flatten value array elements, if possible")                      \
+                                                                             \
+   product(intx, ValueArrayElemMaxFlatSize, -1,                              \
+           "Max size for flattening value array elements, <0 no limit")      \
+                                                                             \
+   product(intx, ValueFieldMaxFlatSize, 128,                                 \
+           "Max size for flattening value type fields, <0 no limit")         \
+                                                                             \
+   product(intx, ValueArrayElemMaxFlatOops, 4,                               \
+           "Max nof embedded object references in a value type to flatten, <0 no limit")  \
+                                                                             \
+   product(bool, ValueArrayAtomicAccess, false,                              \
+           "Atomic value array accesses by-default, for all value arrays")   \
+                                                                             \
    /* Need to limit the extent of the padding to reasonable size.          */\
    /* 8K is well beyond the reasonable HW cache line size, even with       */\
    /* aggressive prefetching, while still leaving the room for segregating */\
    /* among the distinct pages.                                            */\
    product(intx, ContendedPaddingWidth, 128,                                 \
*** 2542,2552 ****
                                                                              \
    JFR_ONLY(product(ccstr, StartFlightRecording, NULL,                       \
            "Start flight recording with options"))                           \
                                                                              \
    experimental(bool, UseFastUnorderedTimeStamps, false,                     \
!           "Use platform unstable time where supported for timestamps only")
  
  #define VM_FLAGS(develop,                                                   \
                   develop_pd,                                                \
                   product,                                                   \
                   product_pd,                                                \
--- 2563,2603 ----
                                                                              \
    JFR_ONLY(product(ccstr, StartFlightRecording, NULL,                       \
            "Start flight recording with options"))                           \
                                                                              \
    experimental(bool, UseFastUnorderedTimeStamps, false,                     \
!           "Use platform unstable time where supported for timestamps only") \
!                                                                             \
!   product(bool, EnableValhalla, false,                                      \
!           "Enable experimental Valhalla features")                          \
!                                                                             \
!   product(bool, EnableValhallaC1, false,                                    \
!           "Enable C1 compiler for Valhalla")                                \
!                                                                             \
!   product_pd(bool, ValueTypePassFieldsAsArgs,                               \
!           "Pass each value type field as an argument at calls")             \
!                                                                             \
!   product_pd(bool, ValueTypeReturnedAsFields,                               \
!           "Return fields instead of a value type reference")                \
!                                                                             \
!   develop(bool, StressValueTypePassFieldsAsArgs, false,                     \
!           "Stress passing each value type field as an argument at calls")   \
!                                                                             \
!   develop(bool, StressValueTypeReturnedAsFields, false,                     \
!           "Stress return of fields instead of a value type reference")      \
!                                                                             \
!   develop(bool, ScalarizeValueTypes, true,                                  \
!           "Scalarize value types in compiled code")                         \
!                                                                             \
!   experimental(uint, ACmpOnValues, 2,                                       \
!                "0 = regular acmp"                                           \
!                "1 = always false for value, perturbation scheme"            \
!                "2 = always false for value"                                 \
!                "3 = substitutability test")                                 \
!                range(0, 3)                                                  \
! 
! 
  
  #define VM_FLAGS(develop,                                                   \
                   develop_pd,                                                \
                   product,                                                   \
                   product_pd,                                                \