Trivial under plan9/9front. Under Win32/POSIX, run way.

On bit shifts, pick any Forth programmer and shaders will be almost like a toy for them. They are used to implement double numbers (and maybe floats) themselves by hand by just reusing the only integer numbers they have and writting custom commands to output these pairs of integer as double numbers. They can probably implement multithreading processing by hand in Forth and also know the IEEE standards for floats better than C programmers over 20 years.