ipiq: Add simple IPI latency measure sysctls (2)
[dragonfly.git] / lib / libm / src / e_remainderf.c
CommitLineData
2fedfd5c
JM
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
17#include "math.h"
18#include "math_private.h"
19
20static const float zero = 0.0;
21
22
23float
24__ieee754_remainderf(float x, float p)
25{
26 int32_t hx,hp;
27 u_int32_t sx;
28 float p_half;
29
30 GET_FLOAT_WORD(hx,x);
31 GET_FLOAT_WORD(hp,p);
32 sx = hx&0x80000000;
33 hp &= 0x7fffffff;
34 hx &= 0x7fffffff;
35
36 /* purge off exception values */
37 if(hp==0) return (x*p)/(x*p); /* p = 0 */
38 if((hx>=0x7f800000)|| /* x not finite */
39 ((hp>0x7f800000))) /* p is NaN */
40 return ((long double)x*p)/((long double)x*p);
41
42
43 if (hp<=0x7effffff) x = __ieee754_fmodf(x,p+p); /* now x < 2p */
44 if ((hx-hp)==0) return zero*x;
45 x = fabsf(x);
46 p = fabsf(p);
47 if (hp<0x01000000) {
48 if(x+x>p) {
49 x-=p;
50 if(x+x>=p) x -= p;
51 }
52 } else {
53 p_half = (float)0.5*p;
54 if(x>p_half) {
55 x-=p;
56 if(x>=p_half) x -= p;
57 }
58 }
59 GET_FLOAT_WORD(hx,x);
60 if ((hx&0x7fffffff)==0) hx = 0;
61 SET_FLOAT_WORD(x,hx^sx);
62 return x;
63}