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 <math.h> |
17 | #include <math_private.h> |
18 | #include <libm-alias-float.h> |
19 | |
20 | |
21 | float |
22 | __ceilf(float x) |
23 | { |
24 | int32_t i0,j0; |
25 | uint32_t i; |
26 | |
27 | GET_FLOAT_WORD(i0,x); |
28 | j0 = ((i0>>23)&0xff)-0x7f; |
29 | if(j0<23) { |
30 | if(j0<0) { |
31 | /* return 0*sign(x) if |x|<1 */ |
32 | if(i0<0) {i0=0x80000000;} |
33 | else if(i0!=0) { i0=0x3f800000;} |
34 | } else { |
35 | i = (0x007fffff)>>j0; |
36 | if((i0&i)==0) return x; /* x is integral */ |
37 | if(i0>0) i0 += (0x00800000)>>j0; |
38 | i0 &= (~i); |
39 | } |
40 | } else { |
41 | if(__builtin_expect(j0==0x80, 0)) return x+x; /* inf or NaN */ |
42 | else return x; /* x is integral */ |
43 | } |
44 | SET_FLOAT_WORD(x,i0); |
45 | return x; |
46 | } |
47 | #ifndef __ceilf |
48 | libm_alias_float (__ceil, ceil) |
49 | #endif |
50 | |