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