Initializes the call sequence.

    Format

      $SETUP_CALL64  arg_count, inline=true | false

1  –  Parameters

 arg_count

    The number of arguments in the call.

 inline

    Forces inline expansion, rather than creation of a JSB routine,
    when set to TRUE. If there are six or fewer arguments on OpenVMS
    Alpha or OpenVMS x86-64; or eight or fewer on OpenVMS I64, the
    default is inline=false.

2  –  Description

    This macro initializes the state for a 64-bit call. It must be
    used before using $PUSH_ARG64 and $CALL64.

    If there are six or fewer arguments on OpenVMS Alpha or OpenVMS
    x86-64; or eight or fewer on OpenVMS I64, the code is always in
    line.

    By default, if there are more than six arguments on OpenVMS Alpha
    or OpenVMS x86-64; or eight arguments on OpenVMS I64, this macro
    creates a JSB routine that is invoked to perform the actual call.
    However, if the inline option is specified as inline=true, the code
    is generated in line.

    This option should be enabled only if the code in which it
    appears has a fixed stack depth. A fixed stack depth can be
    assumed if no RUNTIMSTK or VARSIZSTK messages have been reported.
    Otherwise, if the stack alignment is not at least quadword,
    there might be many alignment faults in the called routine
    and in anything the called routine calls. The default behavior
    (inline=false) does not have this problem.

    If there are more than six arguments on OpenVMS Alpha or OpenVMS
    x86-64; or eight arguments on OpenVMS I64, there can be no
    references to AP or SP between a $SETUP_CALL64 and the matching
    $CALL64, because the $CALL64 code may be in a separate JSB routine.
    In addition, temporary registers (R16 and above) may not survive
    the $SETUP_ CALL64.

                                   NOTE

       The $SETUP_CALL64, $PUSH_ARG64, and $CALL64 macros are
       intended to be used in an inline sequence. That is, you
       cannot branch into the middle of a $SETUP_CALL64/$PUSH_
       ARG64/$CALL64 sequence, nor can you branch around $PUSH_
       ARG64 macros or branch out of the sequence to avoid the
       $CALL64.