1 /* s_ceilf.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 "math.h"
17 #include "math_private.h"
18
19 static const float huge = 1.0e30;
20
21 float
ceilf(float x)22 ceilf(float x)
23 {
24 int32_t i0,j0;
25 u_int32_t i;
26
27 GET_FLOAT_WORD(i0,x);
28 j0 = ((i0>>23)&0xff)-0x7f;
29 if(j0<23) {
30 if(j0<0) { /* raise inexact if x != 0 */
31 if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */
32 if(i0<0) {i0=0x80000000;}
33 else if(i0!=0) { i0=0x3f800000;}
34 }
35 } else {
36 i = (0x007fffff)>>j0;
37 if((i0&i)==0) return x; /* x is integral */
38 if(huge+x>(float)0.0) { /* raise inexact flag */
39 if(i0>0) i0 += (0x00800000)>>j0;
40 i0 &= (~i);
41 }
42 }
43 } else {
44 if(j0==0x80) return x+x; /* inf or NaN */
45 else return x; /* x is integral */
46 }
47 SET_FLOAT_WORD(x,i0);
48 return x;
49 }
50