1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162 |
- /* 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
- /*
- * rintq(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 rintq(x).
- */
- #define NO_MATH_REDIRECT
- #include "quadmath-imp.h"
- static const __float128
- TWO112[2]={
- 5.19229685853482762853049632922009600E+33L, /* 0x406F000000000000, 0 */
- -5.19229685853482762853049632922009600E+33L /* 0xC06F000000000000, 0 */
- };
- __float128 rintq(__float128 x)
- {
- int64_t i0,j0,sx;
- uint64_t i1 __attribute__ ((unused));
- __float128 w,t;
- GET_FLT128_WORDS64(i0,i1,x);
- sx = (((uint64_t)i0)>>63);
- j0 = ((i0>>48)&0x7fff)-0x3fff;
- if(j0<112) {
- if(j0<0) {
- w = TWO112[sx]+x;
- t = w-TWO112[sx];
- GET_FLT128_MSW64(i0,t);
- SET_FLT128_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];
- }
|