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       ---
       s_ceilf.c (1344B)
       ---
            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 #ifndef lint
           17 static char rcsid[] = "$FreeBSD: src/lib/msun/src/s_ceilf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $";
           18 #endif
           19 
           20 #include "math.h"
           21 #include "math_private.h"
           22 
           23 static const float huge = 1.0e30;
           24 
           25 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 }