Test scalbn and scalbln in all rounding modes, add more tests of negative arguments

[Andreas Jaeger]

On 03/18/2014 04:48 PM, Joseph S. Myers wrote:
> Continuing the move to systematically testing libm functions in all
> rounding modes with ALL_RM_TEST, this patch converts the tests of
> scalbn and scalbln to use that macro.
> 
> Those tests include cases of underflow and overflow, meaning the
> expected results depend on the rounding mode.  For convenience in
> writing such tests manually, the patch adds the notation plus_oflow,
> minus_oflow, plus_uflow and minus_uflow for overflowing / underflowing
> results of each sign appropriate to the rounding mode being used, and
> gen-libm-test.pl is made to substitute in the appropriate values.  The
> tests of underflow and overflow are extended to include negative
> arguments to provide better coverage (otherwise minus_oflow and
> minus_uflow wouldn't have been used at all).
> 
> (A subsequent patch will make ldexp use the scalbn tests, as those
> functions are equivalent for binary floating point.)

Ok, thanks,

Andreas
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