1 /* s_rintf.c -- float version of s_rint.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
4 * $FreeBSD: src/lib/msun/src/s_rintf.c,v 1.6 1999/08/28 00:06:54 peter Exp $
5 * $DragonFly: src/lib/msun/src/Attic/s_rintf.c,v 1.4 2004/12/29 17:48:27 asmodai Exp $
9 * ====================================================
10 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
12 * Developed at SunPro, a Sun Microsystems, Inc. business.
13 * Permission to use, copy, modify, and distribute this
14 * software is freely granted, provided that this notice
16 * ====================================================
20 #include "math_private.h"
23 * TWO23 is double instead of float to avoid a bug in gcc. Without
24 * this, gcc thinks that TWO23[sx]+x and w-TWO23[sx] already have float
25 * precision and doesn't clip them to float precision when they are
26 * assigned and returned.
30 8.3886080000e+06, /* 0x4b000000 */
31 -8.3886080000e+06, /* 0xcb000000 */
35 __generic_rintf(float x)
42 j0 = ((i0>>23)&0xff)-0x7f;
45 if((i0&0x7fffffff)==0) return x;
48 i0 |= ((i1|-i1)>>9)&0x400000;
53 SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31));
57 if((i0&i)==0) return x; /* x is integral */
59 if((i0&i)!=0) i0 = (i0&(~i))|((0x100000)>>j0);
62 if(j0==0x80) return x+x; /* inf or NaN */
63 else return x; /* x is integral */