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 <sys/cdefs.h> 17 #if defined(LIBM_SCCS) && !defined(lint) 18 __RCSID("$NetBSD: s_ceilf.c,v 1.8 2008/04/25 22:21:53 christos Exp $"); 19 #endif 20 21 #include "math.h" 22 #include "math_private.h" 23 24 static const float huge = 1.0e30; 25 26 float 27 ceilf(float x) 28 { 29 int32_t i0,jj0; 30 u_int32_t i; 31 32 GET_FLOAT_WORD(i0,x); 33 jj0 = ((i0>>23)&0xff)-0x7f; 34 if(jj0<23) { 35 if(jj0<0) { /* raise inexact if x != 0 */ 36 if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */ 37 if(i0<0) {i0=0x80000000;} 38 else if(i0!=0) { i0=0x3f800000;} 39 } 40 } else { 41 i = (0x007fffff)>>jj0; 42 if((i0&i)==0) return x; /* x is integral */ 43 if(huge+x>(float)0.0) { /* raise inexact flag */ 44 if(i0>0) i0 += (0x00800000)>>jj0; 45 i0 &= (~i); 46 } 47 } 48 } else { 49 if(jj0==0x80) return x+x; /* inf or NaN */ 50 else return x; /* x is integral */ 51 } 52 SET_FLOAT_WORD(x,i0); 53 return x; 54 } 55