1 /* s_modff.c -- float version of s_modf.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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
13 * ====================================================
15 * $NetBSD: s_modff.c,v 1.9 2010/01/27 14:07:41 drochner Exp $ $
19 #include "math_private.h"
21 static const float one = 1.0;
24 modff(float x, float *iptr)
29 jj0 = ((i0>>23)&0xff)-0x7f; /* exponent of x */
30 if(jj0<23) { /* integer part in x */
31 if(jj0<0) { /* |x|<1 */
32 SET_FLOAT_WORD(*iptr,i0&0x80000000); /* *iptr = +-0 */
35 i = (0x007fffff)>>jj0;
36 if((i0&i)==0) { /* x is integral */
40 SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */
43 SET_FLOAT_WORD(*iptr,i0&(~i));
47 } else { /* no fraction part */
50 if (jj0 == 0x80) /* +-inf or NaN */
51 return 0.0 / x; /* +-0 or NaN */
53 SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */