VMS Help MACRO, VAX MACRO Assembler, Instructions, CVTPL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Purpose:        Convert a packed decimal string to a longword
    Format:         opcode srclen.rw,srcaddr.ab,dst.wl
    Operation:      dst = conversion of {src string}
    C. Codes:       N = {dst LSS 0}, V = {integer overflow},
                    Z = {dst EQL 0}, C = 0
    Exceptions:     Reserved operand, integer overflow
    Opcode:         36    CVTPL    Convert packed to long
    Description:    The packed decimal source string src specified by
                    srclen and srcaddr is converted to a longword and
                    the result is placed in dst. dst is stored after all
                    the registers are updated. This means that dst can
                    be a register. Integer overflow can occur if the
                    decimal string converts to a value outside a
                    longword integer range. If this happens dst is
                    replaced by the low order bits of the correct
                    result. Overlapping operands will produce correct
                    results.
    Notes:          After execution:

                    R0 = 0
                    R1 = address of the byte containing the
                         most-significant digit of the source string
                    R2 = 0
                    R3 = 0