22 lines
476 B
Plaintext
22 lines
476 B
Plaintext
// polynomial for approximating log(1+x) in single precision
|
|
//
|
|
// Copyright (c) 2022-2023, Arm Limited.
|
|
// SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception
|
|
|
|
deg = 10;
|
|
|
|
a = -0.25;
|
|
b = 0.5;
|
|
|
|
f = proc(y) {
|
|
return log(1+y);
|
|
};
|
|
|
|
poly = fpminimax(f(x), deg, [|single ...|], [a;b]);
|
|
|
|
display = hexadecimal;
|
|
print("rel error:", accurateinfnorm(1-poly(x)/f(x), [a;b], 30));
|
|
print("in [",a,b,"]");
|
|
print("coeffs:");
|
|
for i from 2 to deg do round(coeff(poly,i), SG, RN);
|