3 * Portions Copyright (c) 1993-1999 Nokia Corporation and/or its subsidiary(-ies).
8 /* @(#)s_ceil.c 5.1 93/09/24 */
10 * ====================================================
11 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
13 * Developed at SunPro, a Sun Microsystems, Inc. business.
14 * Permission to use, copy, modify, and distribute this
15 * software is freely granted, provided that this notice
17 * ====================================================
22 * Return x rounded toward -inf to integral value
26 * Inexact flag raised if x not equal to ceil(x).
31 static const double huge = 1.0e300;
35 Returns the smallest integer that is greater or equal to x
37 @param x Floating point value
39 EXPORT_C double ceil(double x) __SOFTFP
43 EXTRACT_WORDS(i0,i1,x);
44 j0 = ((i0>>20)&0x7ff)-0x3ff;
46 if(j0<0) { /* raise inexact if x != 0 */
47 if(huge+x>0.0) {/* return 0*sign(x) if |x|<1 */
48 if(i0<0) {i0=0x80000000;i1=0;}
49 else if((i0|i1)!=0) { i0=0x3ff00000;i1=0;}
53 if(((i0&i)|i1)==0) return x; /* x is integral */
54 if(huge+x>0.0) { /* raise inexact flag */
55 if(i0>0) i0 += (0x00100000)>>j0;
60 if(j0==0x400) return x+x; /* inf or NaN */
61 else return x; /* x is integral */
63 i = ((__uint32_t)(0xffffffff))>>(j0-20);
64 if((i1&i)==0) return x; /* x is integral */
65 if(huge+x>0.0) { /* raise inexact flag */
69 j = i1 + (1<<(52-j0));
70 if(j<i1) i0+=1; /* got a carry */
77 INSERT_WORDS(x,i0,i1);