1*f3087befSAndrew Turner// polynomial for approximating log(1+x) in single precision 2*f3087befSAndrew Turner// 3*f3087befSAndrew Turner// Copyright (c) 2022-2024, Arm Limited. 4*f3087befSAndrew Turner// SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception 5*f3087befSAndrew Turner 6*f3087befSAndrew Turnerdeg = 10; 7*f3087befSAndrew Turner 8*f3087befSAndrew Turnera = -0.25; 9*f3087befSAndrew Turnerb = 0.5; 10*f3087befSAndrew Turner 11*f3087befSAndrew Turnerf = proc(y) { 12*f3087befSAndrew Turner return log(1+y); 13*f3087befSAndrew Turner}; 14*f3087befSAndrew Turner 15*f3087befSAndrew Turnerpoly = fpminimax(f(x), deg, [|single ...|], [a;b]); 16*f3087befSAndrew Turner 17*f3087befSAndrew Turnerdisplay = hexadecimal; 18*f3087befSAndrew Turnerprint("rel error:", accurateinfnorm(1-poly(x)/f(x), [a;b], 30)); 19*f3087befSAndrew Turnerprint("in [",a,b,"]"); 20*f3087befSAndrew Turnerprint("coeffs:"); 21*f3087befSAndrew Turnerfor i from 2 to deg do round(coeff(poly,i), SG, RN); 22