isnan.h « headers « spu « machine « libm « newlib - cygnal - "Cygwin Native Application Lib" --- http://www.kylheku.com/cygnal

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#include "headers/isnand2.h"

static __inline int _isnan(double x)
{
  return spu_extract(_isnand2(spu_promote(x, 0)), 0);
}