On Mon, Jan 12, 2015 at 11:12 AM, Matthew Hammer <ham...@cs.umd.edu> wrote: > Hi Rust Developers, > I’m in need of this bit-level operation: > > http://en.wikipedia.org/wiki/Find_first_set > > I’m happy to implement it as a loop, but it seems like many architectures > support it directly, as does libc. > > Does anyone know if this is implemented in the Rust standard library or > among the current primitives? > > Searching for “ffs” in the source tree got me nowhere. > > Thanks, > -Matt
I know that there have been people who have brought this to attention. I know there is likely someone who has written a solution, but I can not remember where it was located. I do remember that it involved the usage of inline assembly and #[cfg()] directives. It essentially provided a general implementation that worked everywhere, then it provided implementations specific to a certain architecture. By using the config attribute one could toggle between the generic or architecture specific method being implemented and thus callable. I do not know for certain if it is or is not implemented in the standard library, but I have the feeling that it is not. I tried to look for it but failed. _______________________________________________ Rust-dev mailing list Rust-dev@mozilla.org https://mail.mozilla.org/listinfo/rust-dev
