/sys$common/syshlp/helplib.hlb LINK, Qualifiers, /REPLACE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /REPLACE (default)
       /NOREPLACE

    For Alpha linking, specifies that the linker should perform
    certain optimizations to improve the performance of the resultant
    image when instructed by the compiler.