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[Bug math/21930] C-only gcc builtins used in <math.h> isinf


https://sourceware.org/bugzilla/show_bug.cgi?id=21930

--- Comment #12 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
That approach to iszero seems reasonable (provided it's only for the 
__SUPPORT_SNAN__ case, the case where iszero just compares with zero can 
stay with the template).

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