--- /dev/null	Sat May 10 12:08:50 2014
+++ new/usr/src/lib/libm/common/C/atan2.c	Sat May 10 12:08:50 2014
@@ -0,0 +1,499 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
+ */
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma weak atan2 = __atan2
+
+#include "libm.h"
+
+/*
+ * Let t(0) = 1 and for i = 1, ..., 160, let t(i) be the slope of
+ * the line bisecting the conical hull of the set of points (x,y)
+ * where x and y are positive normal floating point numbers and
+ * the high order words hx and hy of their binary representations
+ * satisfy |hx - hy - i * 0x8000| <= 0x4000.  Then:
+ *
+ * TBL[4*i+2] is t(i) rounded to 21 significant bits (i.e., the
+ *   low order word is zero), and
+ *
+ * TBL[4*i] + TBL[4*i+1] form a doubled-double approximation to
+ *   atan(TBL[4*i+2]).
+ *
+ * Finally, TBL[4*161] = TBL[4*161+1] = TBL[4*161+2] = 0.
+ *
+ * Now for any (x,y) with 0 < y <= x and any 0 < t <= 1,  we have
+ * atan(y/x) = atan(t) + atan((y-t*x)/(x+t*y)).  By choosing t =
+ * TBL[4*i+2], where i is the multiple of 0x8000 nearest hx - hy,
+ * if this multiple is less than 161, and i = 161 otherwise, we
+ * find that |(y-t*x)/(x+t*y)| <~ 2^-5.
+ */
+static const double TBL[] = {
+	7.8539816339744827900e-01, +3.0616169978683830179e-17,
+	1.0000000000000000000e+00, +0,
+	7.7198905126506112140e-01, +2.6989956960083153652e-16,
+	9.7353506088256835938e-01, +0,
+	7.6068143954461309164e-01, -3.5178810518941914972e-16,
+	9.5174932479858398438e-01, +0,
+	7.4953661876353638860e-01, -3.2548100004524337476e-16,
+	9.3073129653930664062e-01, +0,
+	7.3854614984728339522e-01, -2.0775571023910406668e-16,
+	9.1042709350585937500e-01, +0,
+	7.2770146962041337702e-01, +3.8883249403168348802e-16,
+	8.9078664779663085938e-01, +0,
+	7.1699492488093774512e-01, -4.0468841511547224071e-16,
+	8.7176513671875000000e-01, +0,
+	7.0641813488653149022e-01, +5.6902424353981484031e-17,
+	8.5331964492797851562e-01, +0,
+	6.9596351101035658360e-01, +2.8245513321075021303e-16,
+	8.3541154861450195312e-01, +0,
+	6.8562363680534943455e-01, -4.2316970721658854064e-16,
+	8.1800508499145507812e-01, +0,
+	6.7539055666438230219e-01, +4.3535917281300047233e-16,
+	8.0106592178344726562e-01, +0,
+	6.6525763346931832132e-01, +1.1830431602404727977e-17,
+	7.8456401824951171875e-01, +0,
+	6.5521767574310185722e-01, -1.7435923100651044208e-16,
+	7.6847028732299804688e-01, +0,
+	6.4526390999481897381e-01, -1.4741927403093983947e-16,
+	7.5275802612304687500e-01, +0,
+	6.3538979894204850041e-01, +1.5734535069995660853e-16,
+	7.3740243911743164062e-01, +0,
+	6.2558914346942717799e-01, -2.8175588856316910960e-16,
+	7.2238063812255859375e-01, +0,
+	6.1585586476157949676e-01, -4.3056167357725226449e-16,
+	7.0767116546630859375e-01, +0,
+	6.0618408027576098362e-01, +1.5018013918429320289e-16,
+	6.9325399398803710938e-01, +0,
+	5.9656817827486730010e-01, +5.5271942033557644157e-17,
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+	5.7396411895751953125e-01, +0,
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+	5.3341582449436764080e-02, +3.3271673004611311850e-17,
+	5.3392231464385986328e-02, +0,
+	5.2231267345892007370e-02, -3.5593396674200571616e-16,
+	5.2278816699981689453e-02, +0,
+	5.1150874758829623090e-02, +1.4432815841187114832e-16,
+	5.1195532083511352539e-02, +0,
+	5.0098306612679444072e-02, +9.4680943793589404083e-17,
+	5.0140261650085449219e-02, +0,
+	4.9071641675614507960e-02, +2.1131168520301896817e-16,
+	4.9111068248748779297e-02, +0,
+	4.8069135772851545596e-02, +1.6035336741307516296e-16,
+	4.8106193542480468750e-02, +0,
+	4.7089192241088539959e-02, -2.2491738698796901479e-16,
+	4.7124028205871582031e-02, +0,
+	4.6130362086062248750e-02, -1.5111423469578965206e-16,
+	4.6163111925125122070e-02, +0,
+	4.5191314382707403752e-02, +4.1989325207399786612e-16,
+	4.5222103595733642578e-02, +0,
+	4.4270836390474244126e-02, -4.1432635292331004454e-16,
+	4.4299781322479248047e-02, +0,
+	4.3367774164955186222e-02, -3.0615383054587355892e-16,
+	4.3394982814788818359e-02, +0,
+	4.2481121875321825598e-02, -3.6730166956273555173e-16,
+	4.2506694793701171875e-02, +0,
+	4.1609902899457651415e-02, -4.4226425958068821782e-16,
+	4.1633933782577514648e-02, +0,
+	4.0753259129372665370e-02, +1.9801161516527046872e-16,
+	4.0775835514068603516e-02, +0,
+	3.9910361780060910064e-02, +8.2560620036613164573e-18,
+	3.9931565523147583008e-02, +0,
+	3.9080441183869218946e-02, +3.9908991939242971628e-17,
+	3.9100348949432373047e-02, +0,
+	3.8262816593271686827e-02, +9.5182237812195590276e-17,
+	3.8281500339508056641e-02, +0,
+	3.7456806948784837630e-02, +1.5213508760679563439e-16,
+	3.7474334239959716797e-02, +0,
+	3.6661849947035918262e-02, +7.3335516005184616486e-17,
+	3.6678284406661987305e-02, +0,
+	3.5877353272533163420e-02, -1.3007348019891714540e-16,
+	3.5892754793167114258e-02, +0,
+	3.5102754135096780885e-02, -2.9903662298950558656e-16,
+	3.5117179155349731445e-02, +0,
+	3.4337638360670830195e-02, +2.9656295131966114331e-16,
+	3.4351140260696411133e-02, +0,
+	3.3581472523789734907e-02, +3.4810947205572817820e-16,
+	3.3594101667404174805e-02, +0,
+	3.2833871859357266487e-02, -3.8885440174405159838e-16,
+	3.2845675945281982422e-02, +0,
+	3.2094421679560447558e-02, +5.8805134853032009978e-17,
+	3.2105445861816406250e-02, +0,
+	3.1243584858944295490e-02, +2.8737383773884313066e-17,
+	3.1253755092620849609e-02, +0,
+	0, 0, 0, 0
+};
+
+static const double C[] = {
+	0.0,
+	0.125,
+	1.2980742146337069071e+33,
+	7.8539816339744827900e-01,
+	1.5707963267948965580e+00,
+	6.1232339957367658860e-17,
+	-3.1415926535897931160e+00,
+	-1.2246467991473531772e-16,
+	-3.33333333333327571893331786354179101074860633009e-0001,
+	+1.99999999942671624230086497610394721817438631379e-0001,
+	-1.42856965565428636896183013324727205980484158356e-0001,
+	+1.10894981496317081405107718475040168084164825641e-0001,
+};
+
+#define	zero	C[0]
+#define	twom3	C[1]
+#define	two110	C[2]
+#define	pio4	C[3]
+#define	pio2	C[4]
+#define	pio2_lo	C[5]
+#define	mpi	C[6]
+#define	mpi_lo	C[7]
+#define	p1	C[8]
+#define	p2	C[9]
+#define	p3	C[10]
+#define	p4	C[11]
+
+double
+atan2(double oy, double ox) {
+	double	ah, al, t, xh, x, y, z;
+	int	i, k, hx, hy, sx, sy;
+#ifndef lint
+	volatile int	inexact;
+#endif
+
+	hy = ((int *)&oy)[HIWORD];
+	sy = hy & 0x80000000;
+	hy &= ~0x80000000;
+
+	hx = ((int *)&ox)[HIWORD];
+	sx = hx & 0x80000000;
+	hx &= ~0x80000000;
+
+	if (hy > hx || (hy == hx && ((unsigned *)&oy)[LOWORD] >
+	    ((unsigned *)&ox)[LOWORD])) {
+		i = hx;
+		hx = hy;
+		hy = i;
+		x = fabs(oy);
+		y = fabs(ox);
+		if (sx) {
+			ah = pio2;
+			al = pio2_lo;
+		} else {
+			ah = -pio2;
+			al = -pio2_lo;
+			sy ^= 0x80000000;
+		}
+	} else {
+		x = fabs(ox);
+		y = fabs(oy);
+		if (sx) {
+			ah = mpi;
+			al = mpi_lo;
+			sy ^= 0x80000000;
+		} else {
+			ah = al = zero;
+		}
+	}
+
+	if (hx >= 0x7fe00000 || hx - hy >= 0x03600000) {
+		if (hx >= 0x7ff00000) {
+			if (((hx ^ 0x7ff00000) | ((int *)&x)[LOWORD]) != 0)
+				return (ox * oy);
+			if (hy >= 0x7ff00000)
+				ah += pio4;
+#ifndef lint
+			inexact = (int)ah;	/* inexact if ah != 0 */
+#endif
+			return ((sy)? -ah : ah);
+		}
+		if (hx - hy >= 0x03600000) {
+			if ((int)ah == 0)
+				ah = y / x;
+			return ((sy)? -ah : ah);
+		}
+		y *= twom3;
+		x *= twom3;
+		hy -= 0x00300000;
+		hx -= 0x00300000;
+	} else if (hy < 0x00100000) {
+		if ((hy | ((int *)&y)[LOWORD]) == 0) {
+			if ((hx | ((int *)&x)[LOWORD]) == 0)
+				return (_SVID_libm_err(ox, oy, 3));
+#ifndef lint
+			inexact = (int)ah;	/* inexact if ah != 0 */
+#endif
+			return ((sy)? -ah : ah);
+		}
+		y *= two110;
+		x *= two110;
+		hy = ((int *)&y)[HIWORD];
+		hx = ((int *)&x)[HIWORD];
+	}
+
+	k = (((hx - hy) + 0x00004000) >> 13) & ~0x3;
+	if (k > 644)
+		k = 644;
+	ah += TBL[k];
+	al += TBL[k+1];
+	t = TBL[k+2];
+
+	xh = x;
+	((int *)&xh)[LOWORD] = 0;
+	z = ((y - t * xh) - t * (x - xh)) / (x + y * t);
+	x = z * z;
+	t = ah + (z + (al + (z * x) * (p1 + x * (p2 + x * (p3 + x * p4)))));
+	return ((sy)? -t : t);
+}
