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
21static const float
22TWO23[2]={
23 8.3886080000e+06, /* 0x4b000000 */
24 -8.3886080000e+06, /* 0xcb000000 */
25};
26
27float
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
51libm_alias_float (__rint, rint)
52#endif
53