IEEE 754 base-2 exponential function.

Calculates 2^x at exact (1/2 ulp) precision using a 1KB LUT table.

The function first splits the input into whole and fractional parts, and for each bit in the fractional part accumulates a product of iterative square roots. The whole part of the input is inserted into the base-2 exponent of the result.

A (semi-)portable version of the function is written in C, and handwritten assembly versions are written for various operating systems under various architectures (found in src/asm).

Each folder of the project contains a about.txt file describing the usage of the folder and of all files and folders within it.

This project is setup on Meson. Once Meson is installed, b2exp can be compiled like this:

mkdir -p build
meson build
ninja -C build

Instead of build, a different output folder can be used, like output.

Run meson configure build to see the Meson configuration and meson configure --help to see how to change the configuration.

To install b2exp:

ninja -C build install

It may be necessary to prefix the command with sudo.

This project is based on the [LUT algorithm by Claude Baumann (2004)] (https://www.convict.lu/Jeunes/ultimate_stuff/exp_ln_2.htm). Thanks!

Copyright (C) 2019 ARaspiK

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see https://www.gnu.org/licenses/.