Fix ldbl-128ibm hypotl inaccuracy for arguments with large ratio (bug 14868)

[Andreas Jaeger]

On 11/22/2012 12:55 AM, Joseph S. Myers wrote:
> Bug 14868 is inaccuracy of ldbl128-ibm hypotl when the ratio of the
> arguments is above 2**60, but not big enough for a+b to be a correct
> calculation of the result.  2**60 is the ratio used in the dbl-64
> code; this patch fixes the ldbl128-ibm code by changing the ratio
> there to 2**120.
>
> Tested that this fixes the test in question, and the previously seen
> 16 ulp failures for csqrtl, on powerpc, and tested x86_64 and x86 that
> no new ulps are needed for the new test.  (On powerpc there's still a
> spurious underflow exception from csqrtl in the results, but that
> appears to be a separate bug.)

Thanks, this is fine,
Andreas
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