| The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 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 | } |