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RTL Routines, LIB$, LIB$FLT_UNDER, Returns
 *Conan The Librarian 

    OpenVMS usage:longword_unsigned
    type:         longword (unsigned)
    access:       write only
    mechanism:    by value

    The old floating-point underflow enable setting (the previous
    contents of the SF$W_PSW[PSW$V_FU] in the caller's frame).
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