This differs from the existing ~UMul2 in SysLib in that it gives the low-order 16 bits of the true result in the event of overflow. The C standards require this behavior for computations on unsigned types.
Libraries for the ORCA language suite (ORCA/C, ORCA/M, ORCA/Pascal) for the Apple IIGS
If you would like to make changes to this compiler and distribute them to others, feel free to submit them here. If the changes apply to the Apple IIGS, they will generally be approved for distribution on the master branch. For changes that retarget the library to generate code for a different platform, the project will either be forked or a new repository will be created, as appropriate.
The general conditions that must be met before a change is released on master are:
The modified library must compile under the currently released version of ORCA/M.
The various languages that make use of the library mush still pass their respective test suites, or changes to those test suites must also be submitted.
A complete distribution of the ORCA languages, including installers and documentation, is available from the Juiced GS store at https://juiced.gs/store/category/software/. It is distributed as part of the Opus ][ package.