MAC611 implementation
(c) 2018-2019 Sébastien Duval, Gaëtan Leurent

To the extent possible under law, the author(s) have dedicated all
copyright and related and neighboring rights to this software to the
public domain worldwide. This software is distributed without any
warranty.

* This code includes:
- a generic C version (using 32+32->64 multiplier)
- a GNU C version (using 64+64->128 multiplier and 128-bit integers)
- an assembly version for ARM cortex-M0 (using 32+32->64 multiplier)
- an assembly version for ARM cortex-M3 (using 32+32->32 multiplier)

The C version can be compiler under Linux (tested on x86_64) The ARM
assembly versions have been tested with mbedOS, using the gcc compiler
(gcc 4 and gcc 7), with FDRM-K64F and FRDM-KL46Z boards.

* To compile with mbed OS, use the following:

pip install --user mbed-cli
cd armv7M-small
mbed new .
mbed target K64F
mbed toolchain GCC_ARM
mbed compile --profile release

* In order to compile with -O3 instead of -Os, you can do:

perl -pe 's/"-Os"/"-O3"/' mbed-os/tools/profiles/release.json > mbed-os/tools/profiles/fast.json
mbed compile --profile fast

* In order to reduce the size of mbedOS, you can create a file named
  mbed_app.json with the following content:

{
    "requires": ["bare-metal"]
}