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