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 1.6 1999/07/02 15:37:42 simonb Exp $"); 19 #endif 20 21 #include "math.h" 22 #include "math_private.h" 23 24 #ifdef __STDC__ 25 static const float huge = 1.0e30; 26 #else 27 static float huge = 1.0e30; 28 #endif 29 30 #ifdef __STDC__ 31 float ceilf(float x) 32 #else 33 float ceilf(x) 34 float x; 35 #endif 36 { 37 int32_t i0,j0; 38 u_int32_t i; 39 40 GET_FLOAT_WORD(i0,x); 41 j0 = ((i0>>23)&0xff)-0x7f; 42 if(j0<23) { 43 if(j0<0) { /* raise inexact if x != 0 */ 44 if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */ 45 if(i0<0) {i0=0x80000000;} 46 else if(i0!=0) { i0=0x3f800000;} 47 } 48 } else { 49 i = (0x007fffff)>>j0; 50 if((i0&i)==0) return x; /* x is integral */ 51 if(huge+x>(float)0.0) { /* raise inexact flag */ 52 if(i0>0) i0 += (0x00800000)>>j0; 53 i0 &= (~i); 54 } 55 } 56 } else { 57 if(j0==0x80) return x+x; /* inf or NaN */ 58 else return x; /* x is integral */ 59 } 60 SET_FLOAT_WORD(x,i0); 61 return x; 62 } 63