newlib-cygwin/newlib/libm/common/sf_isinf.c

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/*
* isinff(x) returns 1 if x is +-infinity, else 0;
*
* isinff is an extension declared in <ieeefp.h> and
* <math.h>.
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*/
#include "fdlibm.h"
int
_DEFUN (isinff, (x),
float x)
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{
__int32_t ix;
GET_FLOAT_WORD(ix,x);
ix &= 0x7fffffff;
return FLT_UWORD_IS_INFINITE(ix);
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}
#ifdef _DOUBLE_IS_32BITS
#undef isinf
int
_DEFUN (isinf, (x),
double x)
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{
return isinff((float) x);
}
#endif /* defined(_DOUBLE_IS_32BITS) */