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40 lines
929 B
40 lines
929 B
/* _FDnorm function -- IEEE 754 version */
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#include "wctype.h"
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#include "xmath.h"
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_STD_BEGIN
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_CRTIMP2 short _FDnorm(unsigned short *ps)
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{ /* normalize float fraction */
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short xchar;
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unsigned short sign = ps[_F0] & _FSIGN;
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xchar = 1;
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if ((ps[_F0] &= _FFRAC) != 0 || ps[_F1])
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{ /* nonzero, scale */
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if (ps[_F0] == 0)
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ps[_F0] = ps[_F1], ps[_F1] = 0, xchar -= 16;
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for (; ps[_F0] < 1<<_FOFF; --xchar)
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{ /* shift left by 1 */
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ps[_F0] = ps[_F0] << 1 | ps[_F1] >> 15;
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ps[_F1] <<= 1;
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}
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for (; 1<<(_FOFF+1) <= ps[_F0]; ++xchar)
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{ /* shift right by 1 */
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ps[_F1] = ps[_F1] >> 1 | ps[_F0] << 15;
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ps[_F0] >>= 1;
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}
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ps[_F0] &= _FFRAC;
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}
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ps[_F0] |= sign;
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return (xchar);
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}
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_STD_END
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/*
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* Copyright (c) 1994 by P.J. Plauger. ALL RIGHTS RESERVED.
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* Consult your license regarding permissions and restrictions.
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*/
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/*
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941029 pjp: added _STD machinery
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*/
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