Improve tgamma accuracy (bugs 2546, 2560, 5159, 15426)

[Andreas Jaeger]

On 05/03/2013 12:35 AM, Joseph S. Myers wrote:
> This patch fixes various bugs relating to inaccuracy of results from
> tgamma.  Bugs 2546, 2560 and 5159 are different cases of inaccurate
> finite results, arising from the use of exp (lgamma) which inevitably
> results in large errors for results with large (positive or negative)
> exponent.  Bug 15426, found by the new testcases prepared for this
> patch, is wrong sign of infinity on overflow for negative arguments
> close to 0.  (Bugs 15425 and 15427 were also found by testing unfixed
> glibc with the testcases included in this patch; this patch does
> nothing about those bugs in lgammaf and exp, although they no longer
> affect the results of tgamma after the tgamma implementation changes
> in this patch.)

This is fine,
thanks,
Andreas
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