Fix ldbl-128ibm atan2l for x near 1

[Andreas Jaeger]

On 10/31/2012 07:10 PM, Joseph S. Myers wrote:
> Bug 14610 is the ldbl-128ibm implementation of atan2l treating atan2l
> (y, x) as atanl (y) if the high double of x is 1, without checking the
> low double.  This causes large ulps for various clog and clog10 tests.
> This patch fixes the bug in the obvious way and adds an atan2 test for
> it.
>
> Tested x86_64 and x86 (to make sure no new ulps are needed there for
> the new test), and powerpc (to confirm the bug is fixed; ulps for clog
> and clog10 now look reasonable and there are no new ulps for atan2).

Thanks, this is fine.

> It looks like Andreas's ulps patch
> <http://sourceware.org/ml/libc-alpha/2012-10/msg00324.html>, or a
> version updated after this patch, still needs to be committed (and
> then there are still some other issues he noted that should be
> resolved to get clean test results).

Let's get the patch in, ULPs updated are in general fine - I'll answer,

Andreas
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