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#ifndef lint
| 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#ifndef lint
|
17static char rcsid[] = "$FreeBSD: head/lib/msun/src/s_rintf.c 153046 2005-12-03 09:00:29Z bde $";
| 17static char rcsid[] = "$FreeBSD: head/lib/msun/src/s_rintf.c 175480 2008-01-19 16:37:57Z bde $";
|
18#endif
19
| 18#endif
19
|
20#include <sys/types.h>
| 20#include <float.h>
21#include <stdint.h>
22
|
21#include "math.h"
22#include "math_private.h"
23
24static const float
25TWO23[2]={
26 8.3886080000e+06, /* 0x4b000000 */
27 -8.3886080000e+06, /* 0xcb000000 */
28};
29
30float
31rintf(float x)
32{
33 int32_t i0,j0,sx;
| 23#include "math.h"
24#include "math_private.h"
25
26static const float
27TWO23[2]={
28 8.3886080000e+06, /* 0x4b000000 */
29 -8.3886080000e+06, /* 0xcb000000 */
30};
31
32float
33rintf(float x)
34{
35 int32_t i0,j0,sx;
|
34 volatile float w,t; /* volatile works around gcc bug */
| 36 float w,t;
|
35 GET_FLOAT_WORD(i0,x);
36 sx = (i0>>31)&1;
37 j0 = ((i0>>23)&0xff)-0x7f;
38 if(j0<23) {
39 if(j0<0) {
40 if((i0&0x7fffffff)==0) return x;
| 37 GET_FLOAT_WORD(i0,x);
38 sx = (i0>>31)&1;
39 j0 = ((i0>>23)&0xff)-0x7f;
40 if(j0<23) {
41 if(j0<0) {
42 if((i0&0x7fffffff)==0) return x;
|
41 w = TWO23[sx]+x;
| 43 STRICT_ASSIGN(float,w,TWO23[sx]+x);
|
42 t = w-TWO23[sx];
43 GET_FLOAT_WORD(i0,t);
44 SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31));
45 return t;
46 }
| 44 t = w-TWO23[sx];
45 GET_FLOAT_WORD(i0,t);
46 SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31));
47 return t;
48 }
|
47 w = TWO23[sx]+x;
| 49 STRICT_ASSIGN(float,w,TWO23[sx]+x);
|
48 return w-TWO23[sx];
49 }
50 if(j0==0x80) return x+x; /* inf or NaN */
51 else return x; /* x is integral */
52}
| 50 return w-TWO23[sx];
51 }
52 if(j0==0x80) return x+x; /* inf or NaN */
53 else return x; /* x is integral */
54}
|