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

    Purpose:        Allows fast calculation of math functions
    Format:         opcode arg.x,degree.rw,tbladdr.ab
    Operation:      result = Cdegree (first table entry)
                    For degree times, loop
                      result = arg * result
                        Perform multiply and retain an extended
                        floating fraction of 31 bits (POLYF) or
                        63 bits (POLYD). The fraction is truncated
                        before normalization.
                      result = result + Cnext (next table entry)
                        Normalize, round and check for over/
                        underflow only after the combined multiply/
                        add sequence.

                      if overflow then trap.
                      if underflow then clear result, remember
                      underflow and continue looping.
    C. Codes:       N = {R0 LSS 0}, Z = {R0 EQL 0},
                    V = {floating overflow}, C = 0
    Exceptions:     Floating overflow/underflow, reserved operand
    Opcodes:        55    POLYF    Polynomial evaluation F_floating
                    75    POLYD    Polynomial evaluation D_floating
                    55FD  POLYG    Polynomial evaluation G_floating
                    75FD  POLYH    Polynomial evaluation H_floating