1// polynomial for approximating atanf(x) 2// 3// Copyright (c) 2022-2023, Arm Limited. 4// SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception 5 6// Generate list of monomials: 7// Taylor series of atan is of the form x + ax^3 + bx^5 + cx^7 + ... 8// So generate a, b, c, ... such that we can approximate atan(x) by: 9// x + x^3 * (a + bx^2 + cx^4 + ...) 10 11deg = 7; 12 13a = 1.1754943508222875e-38; 14b = 1; 15 16poly = fpminimax((atan(sqrt(x))-sqrt(x))/x^(3/2), deg, [|single ...|], [a;b]); 17 18display = hexadecimal; 19print("coeffs:"); 20for i from 0 to deg do coeff(poly,i); 21