Re: [Xenomai] Building with hard float: cannot open shared object file libpthread_rt.so.1

["Lennart Sorensen" <lsorense@csclub.uwaterloo.ca>]

On Thu, Mar 19, 2015 at 05:04:03PM +0100, Gilles Chanteperdrix wrote:
> My point was, there may be some pathological values that may involve
> using expm1 or logp1 instead of log or exp, and so to avoid pow
> entirely. Also, I am not sure pow optimizes the case where b is an
> integer. It would be interesting to know the actual values of a and
> b which cause pow to explode.

Could be.

For fun I checked how many instructions it took to execute 
pow(1.234000,12.200000) to get 13.003041 and according to my gdb run,
it took 1151 instructions.  Now I did not enable optimization for that
build, which might matter.  Those were of course not all floating pointer
instructions, but quite a few of them are.

With -O3, it dropped to 303 instructions.

I should try the same test on armel to see what difference it shows just
because I am curious.  I would have to setup an armel chroot to run
in first.

-- 
Len Sorensen