| /* 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" |
| |
| #ifdef __STDC__ |
| static const long double |
| #else |
| static long double |
| #endif |
| TWO112[2]={ |
| 5.19229685853482762853049632922009600E+33L, /* 0x406F000000000000, 0 */ |
| -5.19229685853482762853049632922009600E+33L /* 0xC06F000000000000, 0 */ |
| }; |
| |
| #ifdef __STDC__ |
| long double __rintl(long double x) |
| #else |
| long double __rintl(x) |
| long double x; |
| #endif |
| { |
| int64_t i0,j0,sx; |
| u_int64_t i,i1; |
| long double w,t; |
| GET_LDOUBLE_WORDS64(i0,i1,x); |
| sx = (((u_int64_t)i0)>>63); |
| j0 = ((i0>>48)&0x7fff)-0x3fff; |
| if(j0<48) { |
| if(j0<0) { |
| if(((i0&0x7fffffffffffffffLL)|i1)==0) return x; |
| i1 |= (i0&0x0000ffffffffffffLL); |
| i0 &= 0xffffe00000000000ULL; |
| i0 |= ((i1|-i1)>>16)&0x0000800000000000LL; |
| SET_LDOUBLE_MSW64(x,i0); |
| w = TWO112[sx]+x; |
| t = w-TWO112[sx]; |
| GET_LDOUBLE_MSW64(i0,t); |
| SET_LDOUBLE_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63)); |
| return t; |
| } else { |
| i = (0x0000ffffffffffffLL)>>j0; |
| if(((i0&i)|i1)==0) return x; /* x is integral */ |
| i>>=1; |
| if(((i0&i)|i1)!=0) { |
| if(j0==47) i1 = 0x4000000000000000ULL; else |
| i0 = (i0&(~i))|((0x0000200000000000LL)>>j0); |
| } |
| } |
| } else if (j0>111) { |
| if(j0==0x4000) return x+x; /* inf or NaN */ |
| else return x; /* x is integral */ |
| } else { |
| i = -1ULL>>(j0-48); |
| if((i1&i)==0) return x; /* x is integral */ |
| i>>=1; |
| if((i1&i)!=0) i1 = (i1&(~i))|((0x4000000000000000LL)>>(j0-48)); |
| } |
| SET_LDOUBLE_WORDS64(x,i0,i1); |
| w = TWO112[sx]+x; |
| return w-TWO112[sx]; |
| } |
| weak_alias (__rintl, rintl) |
