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 "cdefs-compat.h" 17 //__FBSDID("$FreeBSD: src/lib/msun/src/s_ceilf.c,v 1.8 2008/02/22 02:30:35 das Exp $"); 18 19 #include <openlibm_math.h> 20 21 #include "math_private.h" 22 23 static const float huge = 1.0e30; 24 25 DLLEXPORT float 26 ceilf(float x) 27 { 28 int32_t i0,j0; 29 u_int32_t i; 30 31 GET_FLOAT_WORD(i0,x); 32 j0 = ((i0>>23)&0xff)-0x7f; 33 if(j0<23) { 34 if(j0<0) { /* raise inexact if x != 0 */ 35 if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */ 36 if(i0<0) {i0=0x80000000;} 37 else if(i0!=0) { i0=0x3f800000;} 38 } 39 } else { 40 i = (0x007fffff)>>j0; 41 if((i0&i)==0) return x; /* x is integral */ 42 if(huge+x>(float)0.0) { /* raise inexact flag */ 43 if(i0>0) i0 += (0x00800000)>>j0; 44 i0 &= (~i); 45 } 46 } 47 } else { 48 if(j0==0x80) return x+x; /* inf or NaN */ 49 else return x; /* x is integral */ 50 } 51 SET_FLOAT_WORD(x,i0); 52 return x; 53 } 54