I undid the libcall absolute value functions commit to keep this PR simple. They can be added later in a different PR

what no these are not libc functions.

They are the only functions in src/crt that follow the C calling convention to my knowledge. These functions are defined in <stdlib.h>.
ldivs.src and lrems.src use the LIBCALL convention, but ldiv.src does not

Fine, why is there still a bunch of #if 1 in there

ineg.src and inot.src have two possible implementations (size versus speed optimized), which is why I have an if 1 there.

Although the size optimized implementation mostly just adds a push/pop de to ineg_fast.src and inot_fast.src, so no knowledge would be lost if they are removed.

Then it should be a define to choose size vs speed not some unknown modifier

Why did you remove it????

I removed the size optimized versions of __ineg and __inot. Since a better way to size optimize those routines would be to link to Ti's routines with the PREFER_OS_CRT define

Unless the user doesn't have a CE OS

I also figure that __inot and __ineg are likely the most commonly called routines, and that saving 2 bytes is not really worth it. Having a size optimized version would be better suited towards large and uncommon routines, where something on the order of 20 bytes could be saved for example

this is just moving files and adding documentation now, so it's fine as CI passes.