argument-list

    One or more of the symbolic arguments listed in the following
    table:

    Option         Description

    GRANULARITY    Preserves the rules of VAX granularity of writes.
                   Specifying .PRESERVE=GRANULARITY causes the
                   compiler to use Alpha Load-locked and Store-
                   conditional instruction sequences or the Itanium
                   compare-exchange (cmpxchg) instruction in code it
                   generates for VAX instructions that perform byte,
                   word, or unaligned longword writes.
    ATOMICITY      Preserves atomicity of VAX modify operations.
                   Specifying .PRESERVE=ATOMICITY causes the
                   compiler to use Alpha Load-locked and Store-
                   conditional instruction sequences or the Itanium
                   compare-exchange (cmpxchg) instruction in code
                   it generates for VAX instructions with modify
                   operands.