Library /sys$common/syshlp/dbg$help.hlb DEBUG, SYNCHRONIZE, VECTOR_MODE, Description  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The SYNCHRONIZE VECTOR_MODE command forces immediate
    synchronization between the scalar and vector processors by
    issuing SYNC and MSYNC instructions. The effect is as follows:

    o  Any exception that was caused by a vector instruction and
       was still pending delivery is immediately delivered. Forcing
       the delivery of a pending exception triggers an exception
       breakpoint or tracepoint (if one was set) or invokes an
       exception handler (if one is available at that location in
       the program).

    o  Any read or write operation between vector registers
       and either the general registers or memory is completed
       immediately. That is, any vector memory instruction that was
       still being executed completes execution.

    Entering the SYNCHRONIZE VECTOR_MODE command is equivalent
    to issuing SYNC and MSYNC instructions at the location in the
    program at which execution is suspended.

    By default, the debugger does not force synchronization between
    the scalar and vector processors during program execution (SET
    VECTOR_MODE NOSYNCHRONIZED). To force such synchronization, use
    the SET VECTOR_MODE SYNCHRONIZED command.

    Related commands:

       SET VECTOR_MODE [NO]SYNCHRONIZED (VAX only)
       SHOW VECTOR_MODE (VAX only)