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extern int __isnanf(float f);
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extern int __isnan(double f);
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extern int __isnanl(long double f);
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#define isnan(x) \
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(sizeof (x) == sizeof (float) \
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? __isnanf (x) \
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: sizeof (x) == sizeof (double) \
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? __isnan (x) : __isnanl (x))
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