1 | /* s_rintf.c -- float version of s_rint.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 | #define NO_MATH_REDIRECT |
17 | #include <math.h> |
18 | #include <math_private.h> |
19 | #include <libm-alias-float.h> |
20 | |
21 | static const float |
22 | TWO23[2]={ |
23 | 8.3886080000e+06, /* 0x4b000000 */ |
24 | -8.3886080000e+06, /* 0xcb000000 */ |
25 | }; |
26 | |
27 | float |
28 | __rintf(float x) |
29 | { |
30 | int32_t i0,j0,sx; |
31 | float w,t; |
32 | GET_FLOAT_WORD(i0,x); |
33 | sx = (i0>>31)&1; |
34 | j0 = ((i0>>23)&0xff)-0x7f; |
35 | if(j0<23) { |
36 | if(j0<0) { |
37 | w = TWO23[sx]+x; |
38 | t = w-TWO23[sx]; |
39 | GET_FLOAT_WORD(i0,t); |
40 | SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31)); |
41 | return t; |
42 | } |
43 | } else { |
44 | if(j0==0x80) return x+x; /* inf or NaN */ |
45 | else return x; /* x is integral */ |
46 | } |
47 | w = TWO23[sx]+x; |
48 | return w-TWO23[sx]; |
49 | } |
50 | #ifndef __rintf |
51 | libm_alias_float (__rint, rint) |
52 | #endif |
53 | |