Update.
[glibc.git] / sysdeps / libm-ieee754 / s_ceilf.c
blob29ccadb049c7b669a3f214aa4113548b1fa9282f
1 /* s_ceilf.c -- float version of s_ceil.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
5 /*
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
12 * is preserved.
13 * ====================================================
16 #if defined(LIBM_SCCS) && !defined(lint)
17 static char rcsid[] = "$NetBSD: s_ceilf.c,v 1.4 1995/05/10 20:46:55 jtc Exp $";
18 #endif
20 #include "math.h"
21 #include "math_private.h"
23 #ifdef __STDC__
24 static const float huge = 1.0e30;
25 #else
26 static float huge = 1.0e30;
27 #endif
29 #ifdef __STDC__
30 float __ceilf(float x)
31 #else
32 float __ceilf(x)
33 float x;
34 #endif
36 int32_t i0,j0;
37 u_int32_t i;
39 GET_FLOAT_WORD(i0,x);
40 j0 = ((i0>>23)&0xff)-0x7f;
41 if(j0<23) {
42 if(j0<0) { /* raise inexact if x != 0 */
43 if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */
44 if(i0<0) {i0=0x80000000;}
45 else if(i0!=0) { i0=0x3f800000;}
47 } else {
48 i = (0x007fffff)>>j0;
49 if((i0&i)==0) return x; /* x is integral */
50 if(huge+x>(float)0.0) { /* raise inexact flag */
51 if(i0>0) i0 += (0x00800000)>>j0;
52 i0 &= (~i);
55 } else {
56 if(j0==0x80) return x+x; /* inf or NaN */
57 else return x; /* x is integral */
59 SET_FLOAT_WORD(x,i0);
60 return x;
62 weak_alias (__ceilf, ceilf)