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1906 serge 1 
#include
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int
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__isnan (double _x)
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{
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  unsigned short _sw;
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  __asm__ ("fxam;"
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	   "fstsw %%ax": "=a" (_sw) : "t" (_x));
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  return (_sw & (FP_NAN | FP_NORMAL | FP_INFINITE | FP_ZERO | FP_SUBNORMAL))
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    == FP_NAN;
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}
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#undef isnan
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int __attribute__ ((alias ("__isnan"))) isnan (double);