1/* e_remainderf.c -- float version of e_remainder.c.
2 */
3
4/*
5 * ====================================================
6 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
7 *
8 * Developed at SunPro, a Sun Microsystems, Inc. business.
9 * Permission to use, copy, modify, and distribute this
10 * software is freely granted, provided that this notice
11 * is preserved.
12 * ====================================================
13 */
14
15#include <math.h>
16#include <math_private.h>
17#include <libm-alias-finite.h>
18
19static const float zero = 0.0;
20
21
22float
23__ieee754_remainderf(float x, float p)
24{
25 int32_t hx,hp;
26 uint32_t sx;
27 float p_half;
28
29 GET_FLOAT_WORD(hx,x);
30 GET_FLOAT_WORD(hp,p);
31 sx = hx&0x80000000;
32 hp &= 0x7fffffff;
33 hx &= 0x7fffffff;
34
35 /* purge off exception values */
36 if(hp==0) return (x*p)/(x*p); /* p = 0 */
37 if((hx>=0x7f800000)|| /* x not finite */
38 ((hp>0x7f800000))) /* p is NaN */
39 return (x*p)/(x*p);
40
41
42 if (hp<=0x7effffff) x = __ieee754_fmodf(x,p+p); /* now x < 2p */
43 if ((hx-hp)==0) return zero*x;
44 x = fabsf(x);
45 p = fabsf(p);
46 if (hp<0x01000000) {
47 if(x+x>p) {
48 x-=p;
49 if(x+x>=p) x -= p;
50 }
51 } else {
52 p_half = (float)0.5*p;
53 if(x>p_half) {
54 x-=p;
55 if(x>=p_half) x -= p;
56 }
57 }
58 GET_FLOAT_WORD(hx,x);
59 SET_FLOAT_WORD(x,hx^sx);
60 return x;
61}
62libm_alias_finite (__ieee754_remainderf, __remainderf)
63