glibc very old

[Miles Bader <miles@gnu.org>]

Is there a reason that Debian has such an old version of glibc, even in
unstable?

The current upstream version of glibc seems to be 2.16, whereas Debian
has 2.13 (which is circa 2011-02).

[The particular improvement I'm interested in is a (significantly)
faster version of the "expf" function (unfortunately only on x86-64,
although the silly lossage [FPU mode twiddling] that makes the old
version (currently in Debian!) slow might not be as severe on other
architectures).]

Thanks,

-miles

-- 
Sabbath, n. A weekly festival having its origin in the fact that God made the
world in six days and was arrested on the seventh.