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
21float
22remainderf(float x, float p)
23{
24	int32_t hx,hp;
25	u_int32_t sx;
26	float p_half;
27
28	GET_FLOAT_WORD(hx,x);
29	GET_FLOAT_WORD(hp,p);
30	sx = hx&0x80000000;
31	hp &= 0x7fffffff;
32	hx &= 0x7fffffff;
33
34    /* purge off exception values */
35	if(hp==0) return (x*p)/(x*p);	 	/* p = 0 */
36	if((hx>=0x7f800000)||			/* x not finite */
37	  ((hp>0x7f800000)))			/* p is NaN */
38	    return (x*p)/(x*p);
39
40
41	if (hp<=0x7effffff) x = fmodf(x,p+p);	/* now x < 2p */
42	if ((hx-hp)==0) return zero*x;
43	x  = fabsf(x);
44	p  = fabsf(p);
45	if (hp<0x01000000) {
46	    if(x+x>p) {
47		x-=p;
48		if(x+x>=p) x -= p;
49	    }
50	} else {
51	    p_half = (float)0.5*p;
52	    if(x>p_half) {
53		x-=p;
54		if(x>=p_half) x -= p;
55	    }
56	}
57	GET_FLOAT_WORD(hx,x);
58	SET_FLOAT_WORD(x,hx^sx);
59	return x;
60}
61DEF_STD(remainderf);
62