/sys$common/syshlp/HELPLIB.HLB  —  MACRO  /MIGRATION  MACRO Compiler Directives, .PRESERVE  Example
  INCW 1(R0)

      This instruction, when compiled with .PRESERVE GRANULARITY,
      retries the insertion of the new word value, if it is
      interrupted. However, when compiled with .PRESERVE ATOMICITY,
      it will also refetch the initial value and increment it, if
      interrupted. If both options are specified, it will do the
      latter.
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