Library /sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  Built in Symbols, %ARn
    On I64 systems, specifies the following application registers:

    Register
    Symbol         Definition

    %AR0 . . .     Kernel registers
    %AR7
    %AR16          Register Stack Configuration
    %AR17          Backing Store Pointer
    %AR18          Backing Store Pointer for Memory Stores
    %AR19          RSE NaT Collection
    %AR32          Compare and Exchange Compare Value
    %AR36          User NaT Collection
    %AR40          Floating=point Status
    %AR64          Previous Function State
    %AR65          Loop Count
    %AR66          Epilog Count
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