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