--- /dev/null	Sat May 10 12:08:55 2014
+++ new/usr/src/lib/libm/common/C/pow.c	Sat May 10 12:08:55 2014
@@ -0,0 +1,343 @@
+/*
+ * 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.
+ */
+
+#if defined(ELFOBJ)
+#pragma weak pow = __pow
+#endif
+
+/*
+ * pow(x,y) return x**y
+ *		      n
+ * Method:  Let x =  2   * (1+f)
+ *	1. Compute and return log2(x) in two pieces:
+ *		log2(x) = w1 + w2,
+ *	   where w1 has 24 bits trailing zero.
+ *	2. Perform y*log2(x) by simulating muti-precision arithmetic
+ *	3. Return x**y = exp2(y*log(x))
+ *
+ * Special cases:
+ *	1.  (anything) ** +-0 is 1
+ *	1'. 1 ** (anything)   is 1	(C99; 1 ** +-INF/NAN used to be NAN)
+ *	2.  (anything) ** 1   is itself
+ *	3.  (anything except 1) ** NAN is NAN ("except 1" is C99)
+ *	4.  NAN ** (anything except 0) is NAN
+ *	5.  +-(|x| > 1) **  +INF is +INF
+ *	6.  +-(|x| > 1) **  -INF is +0
+ *	7.  +-(|x| < 1) **  +INF is +0
+ *	8.  +-(|x| < 1) **  -INF is +INF
+ *	9.  -1          ** +-INF is 1	(C99; -1 ** +-INF used to be NAN)
+ *	10. +0 ** (+anything except 0, NAN)               is +0
+ *	11. -0 ** (+anything except 0, NAN, odd integer)  is +0
+ *	12. +0 ** (-anything except 0, NAN)               is +INF
+ *	13. -0 ** (-anything except 0, NAN, odd integer)  is +INF
+ *	14. -0 ** (odd integer) = -( +0 ** (odd integer) )
+ *	15. +INF ** (+anything except 0,NAN) is +INF
+ *	16. +INF ** (-anything except 0,NAN) is +0
+ *	17. -INF ** (anything)  = -0 ** (-anything)
+ *	18. (-anything) ** (integer) is (-1)**(integer)*(+anything**integer)
+ *	19. (-anything except 0 and inf) ** (non-integer) is NAN
+ *
+ * Accuracy:
+ *	pow(x,y) returns x**y nearly rounded. In particular
+ *			pow(integer,integer)
+ *	always returns the correct integer provided it is representable.
+ */
+
+#include "libm.h"
+#include "xpg6.h"	/* __xpg6 */
+#define	_C99SUSv3_pow	_C99SUSv3_pow_treats_Inf_as_an_even_int
+
+static const double zero = 0.0, one = 1.0, two = 2.0;
+
+extern const double _TBL_log2_hi[], _TBL_log2_lo[];
+static const double
+	two53 = 9007199254740992.0,
+	A1_hi = 2.8853900432586669921875,
+	A1_lo = 3.8519259825035041963606002e-8,
+	A1 = 2.885390081777926817222541963606002026086e+0000,
+	A2 = 9.617966939207270828380543979852286255862e-0001,
+	A3 = 5.770807680887875964868853124873696201995e-0001,
+	B0_hi = 2.8853900432586669921875,
+	B0_lo = 3.8519259822532793056374320585e-8,
+	B0 = 2.885390081777926814720293056374320585689e+0000,
+	B1 = 9.617966939259755138949202350396200257632e-0001,
+	B2 = 5.770780163585687000782112776448797953382e-0001,
+	B3 = 4.121985488948771523290174512461778354953e-0001,
+	B4 = 3.207590534812432970433641789022666850193e-0001;
+
+static double
+log2_x(double x, double *w) {
+	double f, s, z, qn, h, t;
+	int *px = (int *) &x;
+	int *pz = (int *) &z;
+	int i, j, ix, n;
+
+	n = 0;
+	ix = px[HIWORD];
+	if (ix >= 0x3fef03f1 && ix < 0x3ff08208) {	/* 65/63 > x > 63/65 */
+		double f1, v;
+		f = x - one;
+		if (((ix - 0x3ff00000) | px[LOWORD]) == 0) {
+			*w = zero;
+			return (zero);		/* log2(1)= +0 */
+		}
+		qn = one / (two + f);
+		s = f * qn;				/* |s|<2**-6 */
+		v = s * s;
+		h = (double) ((float) s);
+		f1 = (double) ((float) f);
+		t = qn * (((f - two * h) - h * f1) - h * (f - f1));
+								/* s = h+t */
+		f1 = h * B0_lo + s * (v * (B1 + v * (B2 + v * (B3 + v * B4))));
+		t = f1 + t * B0;
+		h *= B0_hi;
+		s = (double) ((float) (h + t));
+		*w = t - (s - h);
+		return (s);
+	}
+	if (ix < 0x00100000) {				/* subnormal x */
+		x *= two53;
+		n = -53;
+		ix = px[HIWORD];
+	}
+	/* LARGE N */
+	n += ((ix + 0x1000) >> 20) - 0x3ff;
+	ix = (ix & 0x000fffff) | 0x3ff00000;		/* scale x to [1,2] */
+	px[HIWORD] = ix;
+	i = ix + 0x1000;
+	pz[HIWORD] = i & 0xffffe000;
+	pz[LOWORD] = 0;
+	qn = one / (x + z);
+	f = x - z;
+	s = f * qn;
+	h = (double) ((float) s);
+	t = qn * ((f - (h + h) * z) - h * f);
+	j = (i >> 13) & 0x7f;
+	f = s * s;
+	t = t * A1 + h * A1_lo;
+	t += (s * f) * (A2 + f * A3);
+	qn = h * A1_hi;
+	s = n + _TBL_log2_hi[j];
+	h = qn + s;
+	t += _TBL_log2_lo[j] - ((h - s) - qn);
+	f = (double) ((float) (h + t));
+	*w = t - (f - h);
+	return (f);
+}
+
+extern const double _TBL_exp2_hi[], _TBL_exp2_lo[];
+static const double		/* poly app of 2^x-1 on [-1e-10,2^-7+1e-10] */
+	E1 = 6.931471805599453100674958533810346197328e-0001,
+	E2 = 2.402265069587779347846769151717493815979e-0001,
+	E3 = 5.550410866475410512631124892773937864699e-0002,
+	E4 = 9.618143209991026824853712740162451423355e-0003,
+	E5 = 1.333357676549940345096774122231849082991e-0003;
+
+double
+pow(double x, double y) {
+	double z, ax;
+	double y1, y2, w1, w2;
+	int sbx, sby, j, k, yisint;
+	int hx, hy, ahx, ahy;
+	unsigned lx, ly;
+	int *pz = (int *) &z;
+
+	hx = ((int *) &x)[HIWORD];
+	lx = ((unsigned *) &x)[LOWORD];
+	hy = ((int *) &y)[HIWORD];
+	ly = ((unsigned *) &y)[LOWORD];
+	ahx = hx & ~0x80000000;
+	ahy = hy & ~0x80000000;
+	if ((ahy | ly) == 0) {	/* y==zero  */
+		if ((ahx | lx) == 0)
+			z = _SVID_libm_err(x, y, 20);	/* +-0**+-0 */
+		else if ((ahx | (((lx | -lx) >> 31) & 1)) > 0x7ff00000)
+			z = _SVID_libm_err(x, y, 42);	/* NaN**+-0 */
+		else
+			z = one;			/* x**+-0 = 1 */
+		return (z);
+	} else if (hx == 0x3ff00000 && lx == 0 &&
+		(__xpg6 & _C99SUSv3_pow) != 0)
+		return (one);			/* C99: 1**anything = 1 */
+	else if (ahx > 0x7ff00000 || (ahx == 0x7ff00000 && lx != 0) ||
+		ahy > 0x7ff00000 || (ahy == 0x7ff00000 && ly != 0))
+		return (x * y);	/* +-NaN return x*y; + -> * for Cheetah */
+				/* includes Sun: 1**NaN = NaN */
+	sbx = (unsigned) hx >> 31;
+	sby = (unsigned) hy >> 31;
+	ax = fabs(x);
+
+	/*
+	 * determine if y is an odd int when x < 0
+	 * yisint = 0 ... y is not an integer
+	 * yisint = 1 ... y is an odd int
+	 * yisint = 2 ... y is an even int
+	 */
+	yisint = 0;
+	if (sbx) {
+		if (ahy >= 0x43400000)
+			yisint = 2;		/* even integer y */
+		else if (ahy >= 0x3ff00000) {
+			k = (ahy >> 20) - 0x3ff;	/* exponent */
+			if (k > 20) {
+				j = ly >> (52 - k);
+				if ((j << (52 - k)) == ly)
+					yisint = 2 - (j & 1);
+			} else if (ly == 0) {
+				j = ahy >> (20 - k);
+				if ((j << (20 - k)) == ahy)
+					yisint = 2 - (j & 1);
+			}
+		}
+	}
+	/* special value of y */
+	if (ly == 0) {
+		if (ahy == 0x7ff00000) {	/* y is +-inf */
+			if (((ahx - 0x3ff00000) | lx) == 0) {
+				if ((__xpg6 & _C99SUSv3_pow) != 0)
+					return (one);
+						/* C99: (-1)**+-inf = 1 */
+				else
+					return (y - y);
+						/* Sun: (+-1)**+-inf = NaN */
+			} else if (ahx >= 0x3ff00000)
+						/* (|x|>1)**+,-inf = inf,0 */
+				return (sby == 0 ? y : zero);
+			else			/* (|x|<1)**-,+inf = inf,0 */
+				return (sby != 0 ? -y : zero);
+		}
+		if (ahy == 0x3ff00000) {	/* y is  +-1 */
+			if (sby != 0) {	/* y is -1 */
+				if (x == zero)	/* divided by zero */
+					return (_SVID_libm_err(x, y, 23));
+				else if (ahx < 0x40000 || ((ahx - 0x40000) |
+					lx) == 0)	/* overflow */
+					return (_SVID_libm_err(x, y, 21));
+				else
+					return (one / x);
+			} else
+				return (x);
+		}
+		if (hy == 0x40000000) {		/* y is  2 */
+			if (ahx >= 0x5ff00000 && ahx < 0x7ff00000)
+				return (_SVID_libm_err(x, y, 21));
+							/* x*x overflow */
+			else if ((ahx < 0x1e56a09e && (ahx | lx) != 0) ||
+				(ahx == 0x1e56a09e && lx < 0x667f3bcd))
+				return (_SVID_libm_err(x, y, 22));
+							/* x*x underflow */
+			else
+				return (x * x);
+		}
+		if (hy == 0x3fe00000) {
+			if (!((ahx | lx) == 0 || ((ahx - 0x7ff00000) | lx) ==
+				0 || sbx == 1))
+				return (sqrt(x));	/* y is 0.5 and x > 0 */
+		}
+	}
+	/* special value of x */
+	if (lx == 0) {
+		if (ahx == 0x7ff00000 || ahx == 0 || ahx == 0x3ff00000) {
+			/* x is +-0,+-inf,-1 */
+			z = ax;
+			if (sby == 1) {
+				z = one / z;	/* z = |x|**y */
+				if (ahx == 0)
+					return (_SVID_libm_err(x, y, 23));
+			}
+			if (sbx == 1) {
+				if (ahx == 0x3ff00000 && yisint == 0)
+					z = _SVID_libm_err(x, y, 24);
+					/* neg**non-integral is NaN + invalid */
+				else if (yisint == 1)
+					z = -z;	/* (x<0)**odd = -(|x|**odd) */
+			}
+			return (z);
+		}
+	}
+	/* (x<0)**(non-int) is NaN */
+	if (sbx == 1 && yisint == 0)
+		return (_SVID_libm_err(x, y, 24));
+	/* Now ax is finite, y is finite */
+	/* first compute log2(ax) = w1+w2, with 24 bits w1 */
+	w1 = log2_x(ax, &w2);
+
+	/* split up y into y1+y2 and compute (y1+y2)*(w1+w2) */
+	if (((ly & 0x07ffffff) == 0) || ahy >= 0x47e00000 ||
+		ahy <= 0x38100000) {
+		/* no need to split if y is short or too large or too small */
+		y1 = y * w1;
+		y2 = y * w2;
+	} else {
+		y1 = (double) ((float) y);
+		y2 = (y - y1) * w1 + y * w2;
+		y1 *= w1;
+	}
+	z = y1 + y2;
+	j = pz[HIWORD];
+	if (j >= 0x40900000) {				/* z >= 1024 */
+		if (!(j == 0x40900000 && pz[LOWORD] == 0))	/* z > 1024 */
+			return (_SVID_libm_err(x, y, 21));	/* overflow */
+		else {
+			w2 = y1 - z;
+			w2 += y2;
+							/* rounded to inf */
+			if (w2 >= -8.008566259537296567160e-17)
+				return (_SVID_libm_err(x, y, 21));
+								/* overflow */
+		}
+	} else if ((j & ~0x80000000) >= 0x4090cc00) {	/* z <= -1075 */
+		if (!(j == 0xc090cc00 && pz[LOWORD] == 0))	/* z < -1075 */
+			return (_SVID_libm_err(x, y, 22));	/* underflow */
+		else {
+			w2 = y1 - z;
+			w2 += y2;
+			if (w2 <= zero)			/* underflow */
+				return (_SVID_libm_err(x, y, 22));
+		}
+	}
+	/*
+	 * compute 2**(k+f[j]+g)
+	 */
+	k = (int) (z * 64.0 + (((hy ^ (ahx - 0x3ff00000)) > 0) ? 0.5 : -0.5));
+	j = k & 63;
+	w1 = y2 - ((double) k * 0.015625 - y1);
+	w2 = _TBL_exp2_hi[j];
+	z = _TBL_exp2_lo[j] + (w2 * w1) * (E1 + w1 * (E2 + w1 * (E3 + w1 *
+		(E4 + w1 * E5))));
+	z += w2;
+	k >>= 6;
+	if (k < -1021)
+		z = scalbn(z, k);
+	else			/* subnormal output */
+		pz[HIWORD] += k << 20;
+	if (sbx == 1 && yisint == 1)
+		z = -z;		/* (-ve)**(odd int) */
+	return (z);
+}
