1/* s_frexpl.c -- long double version of s_frexp.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) 17static char rcsid[] = "NetBSD: "; 18#endif 19 20/* 21 * for non-zero x 22 * x = frexpq(arg,&exp); 23 * return a long double fp quantity x such that 0.5 <= |x| <1.0 24 * and the corresponding binary exponent "exp". That is 25 * arg = x*2^exp. 26 * If arg is inf, 0.0, or NaN, then frexpq(arg,&exp) returns arg 27 * with *exp=0. 28 */ 29 30#include "quadmath-imp.h" 31 32static const __float128 33two114 = 2.0769187434139310514121985316880384E+34Q; /* 0x4071000000000000, 0 */ 34 35__float128 frexpq(__float128 x, int *eptr) 36{ 37 uint64_t hx, lx, ix; 38 GET_FLT128_WORDS64(hx,lx,x); 39 ix = 0x7fffffffffffffffULL&hx; 40 *eptr = 0; 41 if(ix>=0x7fff000000000000ULL||((ix|lx)==0)) return x + x;/* 0,inf,nan */ 42 if (ix<0x0001000000000000ULL) { /* subnormal */ 43 x *= two114; 44 GET_FLT128_MSW64(hx,x); 45 ix = hx&0x7fffffffffffffffULL; 46 *eptr = -114; 47 } 48 *eptr += (ix>>48)-16382; 49 hx = (hx&0x8000ffffffffffffULL) | 0x3ffe000000000000ULL; 50 SET_FLT128_MSW64(x,hx); 51 return x; 52} 53