1/* s_modff.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 <math.h>
17#include <math_private.h>
18#include <libm-alias-float.h>
19
20static const float one = 1.0;
21
22float
23__modff(float x, float *iptr)
24{
25 int32_t i0,j0;
26 uint32_t i;
27 GET_FLOAT_WORD(i0,x);
28 j0 = ((i0>>23)&0xff)-0x7f; /* exponent of x */
29 if(__builtin_expect(j0<23, 1)) { /* integer part in x */
30 if(j0<0) { /* |x|<1 */
31 SET_FLOAT_WORD(*iptr,i0&0x80000000); /* *iptr = +-0 */
32 return x;
33 } else {
34 i = (0x007fffff)>>j0;
35 if((i0&i)==0) { /* x is integral */
36 uint32_t ix;
37 *iptr = x;
38 GET_FLOAT_WORD(ix,x);
39 SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */
40 return x;
41 } else {
42 SET_FLOAT_WORD(*iptr,i0&(~i));
43 return x - *iptr;
44 }
45 }
46 } else { /* no fraction part */
47 *iptr = x*one;
48 /* We must handle NaNs separately. */
49 if (j0 == 0x80 && (i0 & 0x7fffff))
50 return x*one;
51 SET_FLOAT_WORD(x,i0&0x80000000); /* return +-0 */
52 return x;
53 }
54}
55libm_alias_float (__modf, modf)
56