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38 lines
730 B
C
38 lines
730 B
C
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/*
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* isinff(x) returns 1 if x is +-infinity, else 0;
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*
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* isinf is a <math.h> macro in the C99 standard. It was previously
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* implemented as isinf and isinff functions by newlib and are still declared
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* as such in <ieeefp.h>. Newlib supplies it here as a function if the user
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* chooses to use <ieeefp.h> or needs to link older code compiled with the
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* previous <math.h> declaration.
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*/
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#include "fdlibm.h"
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#include <ieeefp.h>
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#undef isinff
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int
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_DEFUN (isinff, (x),
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float x)
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{
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__int32_t ix;
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GET_FLOAT_WORD(ix,x);
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ix &= 0x7fffffff;
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return FLT_UWORD_IS_INFINITE(ix);
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}
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#ifdef _DOUBLE_IS_32BITS
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#undef isinf
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int
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_DEFUN (isinf, (x),
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double x)
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{
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return isinff((float) x);
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}
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#endif /* defined(_DOUBLE_IS_32BITS) */
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