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Commit 43576de0 authored by Paul Zimmermann's avatar Paul Zimmermann
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Improve the accuracy of tgamma (BZ #26983)



With this patch, the maximal known error for tgamma is now reduced to 9 ulps
for dbl-64, for all rounding modes. Since exhaustive testing is not possible
for dbl-64, it might be that there are still cases with an error larger than
9 ulps, but all known cases are fixed (intensive tests were done to find cases
with large errors).

Tested on x86_64 and powerpc (and by Adhemerval Zanella on aarch64, arm,
s390x, sparc, and i686).
Reviewed-by: default avatarAdhemerval Zanella <adhemerval.zanella@linaro.org>
parent d1a3dcab
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