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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libm/] [mathfp/] [s_numtest.c] - Rev 301
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/* @(#)z_numtest.c 1.0 98/08/13 */ /****************************************************************** * Numtest * * Input: * x - pointer to a floating point value * * Output: * An integer that indicates what kind of number was passed in: * NUM = 3 - a finite value * NAN = 2 - not a number * INF = 1 - an infinite value * 0 - zero * * Description: * This routine returns an integer that indicates the character- * istics of the number that was passed in. * *****************************************************************/ #include "fdlibm.h" #include "zmath.h" #ifndef _DOUBLE_IS_32BITS int _DEFUN (numtest, (double), double x) { __uint32_t hx, lx; int exp; EXTRACT_WORDS (hx, lx, x); exp = (hx & 0x7ff00000) >> 20; /* Check for a zero input. */ if (x == 0.0) { return (0); } /* Check for not a number or infinity. */ if (exp == 0x7ff) { if(hx & 0xf0000 || lx) return (NAN); else return (INF); } /* Otherwise it's a finite value. */ else return (NUM); } #endif /* _DOUBLE_IS_32BITS */
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