1 /* sf_ceil.c -- float version of s_ceil.c.
2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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 #include "fdlibm.h"
17 
18 #ifdef __STDC__
19 static const float huge = 1.0e30;
20 #else
21 static float huge = 1.0e30;
22 #endif
23 
24 #ifdef __STDC__
ceilf(float x)25 	float ceilf(float x)
26 #else
27 	float ceilf(x)
28 	float x;
29 #endif
30 {
31 	__int32_t i0,j0;
32 	__uint32_t i,ix;
33 	GET_FLOAT_WORD(i0,x);
34 	ix = (i0&0x7fffffff);
35 	j0 = (ix>>23)-0x7f;
36 	if(j0<23) {
37 	    if(j0<0) { 	/* raise inexact if x != 0 */
38 		if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */
39 		    if(i0<0) {i0=0x80000000;}
40 		    else if(!FLT_UWORD_IS_ZERO(ix)) { i0=0x3f800000;}
41 		}
42 	    } else {
43 		i = (0x007fffff)>>j0;
44 		if((i0&i)==0) return x; /* x is integral */
45 		if(huge+x>(float)0.0) {	/* raise inexact flag */
46 		    if(i0>0) i0 += (0x00800000)>>j0;
47 		    i0 &= (~i);
48 		}
49 	    }
50 	} else {
51 	    if(!FLT_UWORD_IS_FINITE(ix)) return x+x; /* inf or NaN */
52 	    else return x;		/* x is integral */
53 	}
54 	SET_FLOAT_WORD(x,i0);
55 	return x;
56 }
57 
58 #ifdef _DOUBLE_IS_32BITS
59 
60 #ifdef __STDC__
ceil(double x)61 	double ceil(double x)
62 #else
63 	double ceil(x)
64 	double x;
65 #endif
66 {
67 	return (double) ceilf((float) x);
68 }
69 
70 #endif /* defined(_DOUBLE_IS_32BITS) */
71