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Corinna Vinschen 799fdda4d2 math.h: Use GCC builtins for C99 macros where available
GCCs builtin functions are mostly type agnostic and architecture
indepedent.  Prefer to use them if available.

	* libc/include/math.h (fpclassify, isfinite, isinf, isnan,
	isnormal): Use matching GCC builtin functions if built with
	GCC 4.4 or later.
	(signbit): Use matching GCC builtin functions if built with
	GCC 4.0 or later.
	(isgreater, isgreaterequal, isless, islessequal, islessgreater,
	isunordered): Use matching GCC builtin functions if built with
	GCC 2.97 or later.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2016-03-26 20:33:46 +01:00
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