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 <sys/cdefs.h>
17#if defined(LIBM_SCCS) && !defined(lint)
18__RCSID("$NetBSD: e_remainderf.c,v 1.6 1999/07/02 15:37:41 simonb Exp $");
19#endif
20
21#include "math.h"
22#include "math_private.h"
23
24static const float zero = 0.0;
25
26
27float
28__ieee754_remainderf(float x, float p)
29{
30	int32_t hx,hp;
31	u_int32_t sx;
32	float p_half;
33
34	GET_FLOAT_WORD(hx,x);
35	GET_FLOAT_WORD(hp,p);
36	sx = hx&0x80000000;
37	hp &= 0x7fffffff;
38	hx &= 0x7fffffff;
39
40    /* purge off exception values */
41	if(hp==0) return (x*p)/(x*p);	 	/* p = 0 */
42	if((hx>=0x7f800000)||			/* x not finite */
43	  ((hp>0x7f800000)))			/* p is NaN */
44	    return (x*p)/(x*p);
45
46
47	if (hp<=0x7effffff) x = __ieee754_fmodf(x,p+p);	/* now x < 2p */
48	if ((hx-hp)==0) return zero*x;
49	x  = fabsf(x);
50	p  = fabsf(p);
51	if (hp<0x01000000) {
52	    if(x+x>p) {
53		x-=p;
54		if(x+x>=p) x -= p;
55	    }
56	} else {
57	    p_half = (float)0.5*p;
58	    if(x>p_half) {
59		x-=p;
60		if(x>=p_half) x -= p;
61	    }
62	}
63	GET_FLOAT_WORD(hx,x);
64	SET_FLOAT_WORD(x,hx^sx);
65	return x;
66}
67