Convert TEST_f_L tests from code to data

[Joseph S. Myers]

On Thu, 16 May 2013, Andreas Jaeger wrote:

> > +    /* XXX this test is incomplete.  We need to have a way to specifiy
> > +       the rounding method and test the critical cases.  So far, only
> > +       unproblematic numbers are tested.  */
> 
> 
> Is the above comment  really reflecting current state? Could you update as
> appropriate, please?

Dealing with XXX comments is already on the todo list 
<http://sourceware.org/glibc/wiki/Development_Todo/Master#libm_testsuite>.  
(And, we don't yet have a mechanism for tests of integer results to 
specify that the result itself is ignored, as I remarked in bug 15470.)

How thorough the coverage is (beyond the rounding mode issue, which *is* 
now covered) - well, that needs a much more general review for many more 
functions in libm-test.inc; deciding whether coverage is sufficient isn't 
necessarily simple (but the llrint tests don't cover subnormals, 
infinities, NaNs, or out-of-range values at present).

-- 
Joseph S. Myers
joseph@codesourcery.com