VMS Help MACRO, /MIGRATION, Compiler Directives, .PRESERVE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Directs the compiler to generate special Alpha assembly code
    for VAX MACRO instructions, within portions of the source
    module, that rely on VAX guarantees of operation atomicity or
    granularity.

    Format

      .[NO]PRESERVE  argument-list

  Additional Information (explode) :

• Parameters
• Description
• Example