1 /* e_fmodl.c -- long double version of e_fmod.c.
2 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
5 * ====================================================
6 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 * Developed at SunPro, a Sun Microsystems, Inc. business.
9 * Permission to use, copy, modify, and distribute this
10 * software is freely granted, provided that this notice
12 * ====================================================
17 * returns x REM p = x - [x/p]*p as if in infinite
18 * precise arithmetic, where [x/p] is the (infinite bit)
19 * integer nearest x/p (in half way case choose the even one).
21 * Based on fmodq() return x-[x/p]chopped*p exactlp.
24 #include "quadmath-imp.h"
26 static const __float128 zero = 0.0Q;
29 remainderq (__float128 x, __float128 p)
35 GET_FLT128_WORDS64(hx,lx,x);
36 GET_FLT128_WORDS64(hp,lp,p);
37 sx = hx&0x8000000000000000ULL;
38 hp &= 0x7fffffffffffffffLL;
39 hx &= 0x7fffffffffffffffLL;
41 /* purge off exception values */
42 if((hp|lp)==0) return (x*p)/(x*p); /* p = 0 */
43 if((hx>=0x7fff000000000000LL)|| /* x not finite */
44 ((hp>=0x7fff000000000000LL)&& /* p is NaN */
45 (((hp-0x7fff000000000000LL)|lp)!=0)))
48 if (hp<=0x7ffdffffffffffffLL) x = fmodq (x,p+p); /* now x < 2p */
49 if (((hx-hp)|(lx-lp))==0) return zero*x;
52 if (hp<0x0002000000000000LL) {
64 GET_FLT128_MSW64(hx,x);
65 SET_FLT128_MSW64(x,hx^sx);