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[Bug math/15367] Let gcc use __builtin_isinf


https://sourceware.org/bugzilla/show_bug.cgi?id=15367

--- Comment #11 from Marc Glisse <marc.glisse at normalesup dot org> ---
The gcc documentation of __builtin_isinf_sign has just been updated, so it can
now be used to implement isinf in glibc.
http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=202021
(the code was always fine, this is only important as a promise not to change
the behavior in the future)

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