Use ALL_RM_TEST for more libm tests

[Andreas Jaeger]

On 03/19/2014 04:55 PM, Joseph S. Myers wrote:
> Continuing the move to using ALL_RM_TEST for tests in libm-test.inc,
> this patch converts the tests of fdim, ldexp and scalb.  fdim and
> scalb are cases where tests could depend on the rounding mode though
> none of the present test inputs do; ldexp is such a case where the
> function is equivalent to scalbn (for binary floating point) and the
> tests used were a subset of those for scalbn, so this patch makes
> ldexp testing use the scalbn tests, as done for other cases of libm
> function aliases.

nice, thanks,

Andreas
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