38 lines
757 B
C
38 lines
757 B
C
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/* @(#)z_isinf.c 1.0 98/08/13 */
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/******************************************************************
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* isinf
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*
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* Input:
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* x - pointer to a floating point value
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*
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* Output:
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* An integer that indicates if the number is infinite.
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*
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* Description:
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* This routine returns an integer that indicates if the number
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* passed in is infinite (1) or is finite (0).
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*
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*****************************************************************/
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#include "fdlibm.h"
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#include "zmath.h"
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#ifndef _DOUBLE_IS_32BITS
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int isinf (double x)
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{
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__uint32_t lx, hx;
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int exp;
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EXTRACT_WORDS (hx, lx, x);
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exp = (hx & 0x7ff00000) >> 20;
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if ((exp == 0x7ff) && ((hx & 0xf0000 || lx) == 0))
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return (1);
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else
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return (0);
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}
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#endif /* _DOUBLE_IS_32BITS */
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