Fix dbl-64 hypot spurious underflows (bug 16314)

[Andreas Jaeger]

On 12/16/2013 11:26 PM, Joseph S. Myers wrote:
> This patch, relative to a tree with
> <https://sourceware.org/ml/libc-alpha/2013-12/msg00597.html> applied,
> fixes bug 16314, spurious underflows from dbl-64 hypot for input
> values a bit above 0x1p-500.  In these cases, squaring the inputs does
> not result in underflow, but squaring values constructed as low parts
> of inputs does result in underflow; the fix is simply to adjust the
> threshold for scaling up inputs from 0x1p-500 to 0x1p-450 (the same as
> used for ldbl-128ibm).  I don't think any of the other hypot
> implementations have this particular problem.

ok,

Thanks,
Andreas
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