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e_atan2.c (176451) e_atan2.c (181062)
1
2/* @(#)e_atan2.c 1.3 95/01/18 */
3/*
4 * ====================================================
5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 *
7 * Developed at SunSoft, a Sun Microsystems, Inc. business.
8 * Permission to use, copy, modify, and distribute this
9 * software is freely granted, provided that this notice
10 * is preserved.
11 * ====================================================
12 *
13 */
14
15#include <sys/cdefs.h>
1
2/* @(#)e_atan2.c 1.3 95/01/18 */
3/*
4 * ====================================================
5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 *
7 * Developed at SunSoft, a Sun Microsystems, Inc. business.
8 * Permission to use, copy, modify, and distribute this
9 * software is freely granted, provided that this notice
10 * is preserved.
11 * ====================================================
12 *
13 */
14
15#include <sys/cdefs.h>
16__FBSDID("$FreeBSD: head/lib/msun/src/e_atan2.c 176451 2008-02-22 02:30:36Z das $");
16__FBSDID("$FreeBSD: head/lib/msun/src/e_atan2.c 181062 2008-07-31 19:57:50Z das $");
17
18/* __ieee754_atan2(y,x)
19 * Method :
20 * 1. Reduce y to positive by atan2(y,x)=-atan2(-y,x).
21 * 2. Reduce x to positive by (if x and y are unexceptional):
22 * ARG (x+iy) = arctan(y/x) ... if x > 0,
23 * ARG (x+iy) = pi - arctan[y/(-x)] ... if x < 0,
24 *

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40 * constants. The decimal values may be used, provided that the
41 * compiler will convert from decimal to binary accurately enough
42 * to produce the hexadecimal values shown.
43 */
44
45#include "math.h"
46#include "math_private.h"
47
17
18/* __ieee754_atan2(y,x)
19 * Method :
20 * 1. Reduce y to positive by atan2(y,x)=-atan2(-y,x).
21 * 2. Reduce x to positive by (if x and y are unexceptional):
22 * ARG (x+iy) = arctan(y/x) ... if x > 0,
23 * ARG (x+iy) = pi - arctan[y/(-x)] ... if x < 0,
24 *

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40 * constants. The decimal values may be used, provided that the
41 * compiler will convert from decimal to binary accurately enough
42 * to produce the hexadecimal values shown.
43 */
44
45#include "math.h"
46#include "math_private.h"
47
48static volatile double
49tiny = 1.0e-300;
48static const double
50static const double
49tiny = 1.0e-300,
50zero = 0.0,
51pi_o_4 = 7.8539816339744827900E-01, /* 0x3FE921FB, 0x54442D18 */
52pi_o_2 = 1.5707963267948965580E+00, /* 0x3FF921FB, 0x54442D18 */
51zero = 0.0,
52pi_o_4 = 7.8539816339744827900E-01, /* 0x3FE921FB, 0x54442D18 */
53pi_o_2 = 1.5707963267948965580E+00, /* 0x3FF921FB, 0x54442D18 */
53pi = 3.1415926535897931160E+00, /* 0x400921FB, 0x54442D18 */
54pi = 3.1415926535897931160E+00; /* 0x400921FB, 0x54442D18 */
55static volatile double
54pi_lo = 1.2246467991473531772E-16; /* 0x3CA1A626, 0x33145C07 */
55
56double
57__ieee754_atan2(double y, double x)
58{
59 double z;
60 int32_t k,m,hx,hy,ix,iy;
61 u_int32_t lx,ly;

--- 62 unchanged lines hidden --- 		56pi_lo = 1.2246467991473531772E-16; /* 0x3CA1A626, 0x33145C07 */
57
58double
59__ieee754_atan2(double y, double x)
60{
61 double z;
62 int32_t k,m,hx,hy,ix,iy;
63 u_int32_t lx,ly;

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