[libgfortran, patch] Remove runtime clz() and ctz() bit intrisic functions

Janne Blomqvist blomqvist.janne@gmail.com
Mon Dec 19 15:47:00 GMT 2016


On Mon, Dec 19, 2016 at 4:48 PM, FX <fxcoudert@gmail.com> wrote:
> We implement the LEADZ and TRAILZ intrinsics in terms of the built-in clz() and ctz() functions. Since these are not available for 128-bit integer types, we used to have support functions _gfortran_clz128() and _gfortran_ctz128() in libgfortran. In 2010, I applied a patch to avoid this and emit the necessary arithmetic directly from the front-end (https://gcc.gnu.org/ml/fortran/2010-09/msg00181.html). The support functions were kept in libgfortran for backward compatibility, but we can now remove them as we break the ABI.
>
> Attached patch is bootstrapped and regtested on x86_64-apple-darwin13.6.0.
> OK to commit?

Hmm, I distinctly remember that this was part of my big-ish patch I
just committed, but on closer inspection, no, maybe I just had it
queued up in my own branch..

So yes, Ok!


-- 
Janne Blomqvist



More information about the Gcc-patches mailing list