paper about impl

https://www.netlib.org/fdlibm/ https://www.netlib.org/fdlibm/readme

NOTE: “In this release, only double precision is supported."

https://www.netlib.org/cephes/

https://svnweb.freebsd.org/base/release/9.3.0/lib/msun/src/

core-math

https://core-math.gitlabpages.inria.fr/

mpfr

https://www.mpfr.org/

llvm math

https://libc.llvm.org/math/

rlibm