1/* e_remainderf.c -- float version of e_remainder.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
19static const float zero = 0.0;
20
21
22float
23remainderf(float x, float p)
24{
25	int32_t hx,hp;
26	u_int32_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)||			 	/* p = 0 */
37	  (hx>=0x7f800000)||			/* x not finite */
38	  ((hp>0x7f800000)))			/* p is NaN */
39	    return nan_mix_op(x, p, *)/nan_mix_op(x, p, *);
40
41
42	if (hp<=0x7effffff) x = 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	if ((hx&0x7fffffff)==0) hx = 0;
60	SET_FLOAT_WORD(x,hx^sx);
61	return x;
62}
63