1 /* s_rintl.c -- long double version of s_rint.c. 2 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz. 3 */ 4 5 /* 6 * ==================================================== 7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 8 * 9 * Developed at SunPro, a Sun Microsystems, Inc. business. 10 * Permission to use, copy, modify, and distribute this 11 * software is freely granted, provided that this notice 12 * is preserved. 13 * ==================================================== 14 */ 15 16 #if defined(LIBM_SCCS) && !defined(lint) 17 static char rcsid[] = "NetBSD: "; 18 #endif 19 20 /* 21 * rintq(x) 22 * Return x rounded to integral value according to the prevailing 23 * rounding mode. 24 * Method: 25 * Using floating addition. 26 * Exception: 27 * Inexact flag raised if x not equal to rintq(x). 28 */ 29 30 #define NO_MATH_REDIRECT 31 32 #include "quadmath-imp.h" 33 34 static const __float128 35 TWO112[2]={ 36 5.19229685853482762853049632922009600E+33L, /* 0x406F000000000000, 0 */ 37 -5.19229685853482762853049632922009600E+33L /* 0xC06F000000000000, 0 */ 38 }; 39 40 __float128 rintq(__float128 x) 41 { 42 int64_t i0,j0,sx; 43 uint64_t i1 __attribute__ ((unused)); 44 __float128 w,t; 45 GET_FLT128_WORDS64(i0,i1,x); 46 sx = (((uint64_t)i0)>>63); 47 j0 = ((i0>>48)&0x7fff)-0x3fff; 48 if(j0<112) { 49 if(j0<0) { 50 w = TWO112[sx]+x; 51 t = w-TWO112[sx]; 52 GET_FLT128_MSW64(i0,t); 53 SET_FLT128_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63)); 54 return t; 55 } 56 } else { 57 if(j0==0x4000) return x+x; /* inf or NaN */ 58 else return x; /* x is integral */ 59 } 60 w = TWO112[sx]+x; 61 return w-TWO112[sx]; 62 } 63