AEST tries to find, parse, and translate as much Alpha code as
    possible to minimize the need for interpreting Alpha code at run
    time. By default, AEST uses the EISD$V_EXE ISD flag to translate
    all code that it finds in image sections marked as "executable".

    If you specify /INTERPRET, AEST still analyzes all the code found
    in "executable" Alpha image sections and creates corresponding
    structures in the resulting I64 image, but it did not generate
    corresponding I64 code. This minimizes the AEST execution time and
    virtual memory required for translation.

    Note that run-time performance of a translated image using
    /INTERPRET will be slower than one where the code is translated.