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RTL Routines, LIB$, LIB$POLYT
*Conan The Librarian
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(Alpha and I64 only.) The Evaluate Polynomials routine (IEEE T-
floating values) allows higher-level language users to evaluate
IEEE T-floating polynomials.
Format
LIB$POLYT polynomial-argument ,degree ,coefficient
,floating-point-result
OpenVMS usage:cond_value
type: longword (unsigned)
access: write only
mechanism: by value
polynomial-argument
OpenVMS usage:floating_point
type: IEEE T_floating
access: read only
mechanism: by reference
Argument for the polynomial. The polynomial-argument argument
is the address of a floating-point number that contains this
argument. The polynomial-argument argument is an IEEE T-floating
number.
degree
OpenVMS usage:word_signed
type: word (signed)
access: read only
mechanism: by reference
Highest-numbered nonzero coefficient to participate in the
evaluation. The degree argument is the address of a signed word
integer that contains this highest-numbered coefficient.
If the degree is 0, the result equals C[0]. The range of the
degree is 0 to 31.
coefficient
OpenVMS usage:floating_point
type: IEEE T_floating
access: read only
mechanism: by reference, array reference
The address of an array of floating-point coefficients. The
coefficient of the highest-order term of the polynomial is the
lowest addressed element in the array. The coefficient argument
is an array of IEEE T-floating numbers.
floating-point-result
OpenVMS usage:floating_point
type: IEEE T_floating
access: write only
mechanism: by reference
Result of the calculation. The floating-point-result argument is
the address of a floating-point number that contains this result.
LIB$POLYT writes the address of floating-point-result into an
IEEE T-floating number.
Intermediate multiplications are carried out using extended
floating-point fractions (31 bits for POLYT).