1 /* sf_modf.c -- float version of s_modf.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 "fdlibm.h"
17
18 float
modff(float x,float * iptr)19 modff(float x, float *iptr)
20 {
21 __int32_t i0,j0;
22 __uint32_t i;
23 GET_FLOAT_WORD(i0,x);
24 j0 = ((i0>>23)&0xff)-0x7f; /* exponent of x */
25 if(j0<23) { /* integer part in x */
26 if(j0<0) { /* |x|<1 */
27 SET_FLOAT_WORD(*iptr,i0&0x80000000); /* *iptr = +-0 */
28 return x;
29 } else {
30 i = (0x007fffff)>>j0;
31 if((i0&i)==0) { /* x is integral */
32 *iptr = x;
33 SET_FLOAT_WORD(x,i0&0x80000000); /* return +-0 */
34 return x;
35 } else {
36 SET_FLOAT_WORD(*iptr,i0&(~i));
37 return x - *iptr;
38 }
39 }
40 } else { /* no fraction part */
41 *iptr = x;
42 if (__fpclassifyf(x) == FP_NAN) return *iptr = x+x; /* x is NaN, return NaN */
43 SET_FLOAT_WORD(x,i0&0x80000000); /* return +-0 */
44 return x;
45 }
46 }
47
48 _MATH_ALIAS_f_fF(modf)
49
