1 /* s_ceill.c -- long double version of s_ceil.c.
2 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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
13 * ====================================================
16 #if defined(LIBM_SCCS) && !defined(lint)
17 static char rcsid[] = "$NetBSD: $";
22 * Return x rounded toward -inf to integral value
26 * Inexact flag raised if x not equal to ceil(x).
30 #include "math_private.h"
33 static const long double huge = 1.0e4930;
35 static long double huge = 1.0e4930;
39 long double __ceill(long double x)
41 long double __ceill(x)
47 GET_LDOUBLE_WORDS64(i0,i1,x);
48 j0 = ((i0>>48)&0x7fff)-0x3fff;
50 if(j0<0) { /* raise inexact if x != 0 */
51 if(huge+x>0.0) {/* return 0*sign(x) if |x|<1 */
52 if(i0<0) {i0=0x8000000000000000ULL;i1=0;}
53 else if((i0|i1)!=0) { i0=0x3fff000000000000ULL;i1=0;}
56 i = (0x0000ffffffffffffULL)>>j0;
57 if(((i0&i)|i1)==0) return x; /* x is integral */
58 if(huge+x>0.0) { /* raise inexact flag */
59 if(i0>0) i0 += (0x0001000000000000LL)>>j0;
64 if(j0==0x4000) return x+x; /* inf or NaN */
65 else return x; /* x is integral */
68 if((i1&i)==0) return x; /* x is integral */
69 if(huge+x>0.0) { /* raise inexact flag */
73 j = i1+(1LL<<(112-j0));
74 if(j<i1) i0 +=1 ; /* got a carry */
81 SET_LDOUBLE_WORDS64(x,i0,i1);
84 weak_alias (__ceill, ceill)