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 #include "math.h" 18 #include "math_private.h" 19 20 static const float huge = 1.0e30; 21 22 float 23 ceilf(float x) 24 { 25 int32_t i0,j0; 26 u_int32_t i; 27 28 GET_FLOAT_WORD(i0,x); 29 j0 = ((i0>>23)&0xff)-0x7f; 30 if(j0<23) { 31 if(j0<0) { /* raise inexact if x != 0 */ 32 if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */ 33 if(i0<0) {i0=0x80000000;} 34 else if(i0!=0) { i0=0x3f800000;} 35 } 36 } else { 37 i = (0x007fffff)>>j0; 38 if((i0&i)==0) return x; /* x is integral */ 39 if(huge+x>(float)0.0) { /* raise inexact flag */ 40 if(i0>0) i0 += (0x00800000)>>j0; 41 i0 &= (~i); 42 } 43 } 44 } else { 45 if(j0==0x80) return x+x; /* inf or NaN */ 46 else return x; /* x is integral */ 47 } 48 SET_FLOAT_WORD(x,i0); 49 return x; 50 } 51