1 /* s_nearbyintl.c -- long double version of s_nearbyint.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 /* 17 * nearbyintq(x) 18 * Return x rounded to integral value according to the prevailing 19 * rounding mode. 20 * Method: 21 * Using floating addition. 22 * Exception: 23 * Inexact flag raised if x not equal to rintq(x). 24 */ 25 26 #include "quadmath-imp.h" 27 28 static const __float128 29 TWO112[2]={ 30 5.19229685853482762853049632922009600E+33Q, /* 0x406F000000000000, 0 */ 31 -5.19229685853482762853049632922009600E+33Q /* 0xC06F000000000000, 0 */ 32 }; 33 34 __float128 nearbyintq(__float128 x) 35 { 36 fenv_t env; 37 int64_t i0,j0,sx; 38 uint64_t i1 __attribute__ ((unused)); 39 __float128 w,t; 40 GET_FLT128_WORDS64(i0,i1,x); 41 sx = (((uint64_t)i0)>>63); 42 j0 = ((i0>>48)&0x7fff)-0x3fff; 43 if(j0<112) { 44 if(j0<0) { 45 feholdexcept (&env); 46 w = TWO112[sx] + math_opt_barrier (x); 47 t = w-TWO112[sx]; 48 math_force_eval (t); 49 fesetenv (&env); 50 GET_FLT128_MSW64(i0,t); 51 SET_FLT128_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63)); 52 return t; 53 } 54 } else { 55 if(j0==0x4000) return x+x; /* inf or NaN */ 56 else return x; /* x is integral */ 57 } 58 feholdexcept (&env); 59 w = TWO112[sx] + math_opt_barrier (x); 60 t = w-TWO112[sx]; 61 math_force_eval (t); 62 fesetenv (&env); 63 return t; 64 } 65