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/* s_rintl.c -- long double version of s_rint.c.
* Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
*/
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: $";
#endif
/*
* rintl(x)
* Return x rounded to integral value according to the prevailing
* rounding mode.
* Method:
* Using floating addition.
* Exception:
* Inexact flag raised if x not equal to rintl(x).
*/
#include "math.h"
#include "math_private.h"
static const long double
TWO112[2]={
5.19229685853482762853049632922009600E+33L, /* 0x406F000000000000, 0 */
-5.19229685853482762853049632922009600E+33L /* 0xC06F000000000000, 0 */
};
long double __rintl(long double x)
{
int64_t i0,j0,sx;
u_int64_t i1;
long double w,t;
GET_LDOUBLE_WORDS64(i0,i1,x);
sx = (((u_int64_t)i0)>>63);
j0 = ((i0>>48)&0x7fff)-0x3fff;
if(j0<112) {
if(j0<0) {
w = TWO112[sx]+x;
t = w-TWO112[sx];
GET_LDOUBLE_MSW64(i0,t);
SET_LDOUBLE_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63));
return t;
}
} else {
if(j0==0x4000) return x+x; /* inf or NaN */
else return x; /* x is integral */
}
w = TWO112[sx]+x;
return w-TWO112[sx];
}
weak_alias (__rintl, rintl)
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