34 lines
670 B
C
34 lines
670 B
C
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/* @(#)z_isnanf.c 1.0 98/08/13 */
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/******************************************************************
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* isnanf
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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 NaN.
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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 NaN (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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int isnanf (float x)
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{
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__int32_t wx;
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int exp;
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GET_FLOAT_WORD (wx, x);
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exp = (wx & 0x7f800000) >> 23;
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if ((exp == 0x7f8) && (wx & 0x7fffff))
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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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