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#if defined(LIBM_SCCS) && !defined(lint)
17static char rcsid[] = "$NetBSD: e_remainderf.c,v 1.4 1995/05/10 20:46:08 jtc Exp $";
18#endif
19
20#include "math.h"
21#include "math_private.h"
22
23#ifdef __STDC__
24static const float zero = 0.0;
25#else
26static float zero = 0.0;
27#endif
28
29
30#ifdef __STDC__
31	float __ieee754_remainderf(float x, float p)
32#else
33	float __ieee754_remainderf(x,p)
34	float x,p;
35#endif
36{
37	int32_t hx,hp;
38	u_int32_t sx;
39	float p_half;
40
41	GET_FLOAT_WORD(hx,x);
42	GET_FLOAT_WORD(hp,p);
43	sx = hx&0x80000000;
44	hp &= 0x7fffffff;
45	hx &= 0x7fffffff;
46
47    /* purge off exception values */
48	if(hp==0) return (x*p)/(x*p);	 	/* p = 0 */
49	if((hx>=0x7f800000)||			/* x not finite */
50	  ((hp>0x7f800000)))			/* p is NaN */
51	    return (x*p)/(x*p);
52
53
54	if (hp<=0x7effffff) x = __ieee754_fmodf(x,p+p);	/* now x < 2p */
55	if ((hx-hp)==0) return zero*x;
56	x  = fabsf(x);
57	p  = fabsf(p);
58	if (hp<0x01000000) {
59	    if(x+x>p) {
60		x-=p;
61		if(x+x>=p) x -= p;
62	    }
63	} else {
64	    p_half = (float)0.5*p;
65	    if(x>p_half) {
66		x-=p;
67		if(x>=p_half) x -= p;
68	    }
69	}
70	GET_FLOAT_WORD(hx,x);
71	SET_FLOAT_WORD(x,hx^sx);
72	return x;
73}
74