--- /dev/null	Sat May 10 12:09:31 2014
+++ new/usr/src/lib/libm/common/m9x/nearbyint.c	Sat May 10 12:09:32 2014
@@ -0,0 +1,223 @@
+/*
+ * 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 nearbyint = __nearbyint
+#endif
+
+/*
+ * nearbyint(x) returns the nearest fp integer to x in the direction
+ * corresponding to the current rounding direction without raising
+ * the inexact exception.
+ *
+ * nearbyint(x) is x unchanged if x is +/-0 or +/-inf.  If x is NaN,
+ * nearbyint(x) is also NaN.
+ */
+
+#include "libm.h"
+#include "fenv_synonyms.h"
+#include <fenv.h>
+
+double
+__nearbyint(double x) {
+	union {
+		unsigned i[2];
+		double d;
+	} xx;
+	unsigned hx, sx, i, frac;
+	int rm, j;
+
+	xx.d = x;
+	sx = xx.i[HIWORD] & 0x80000000;
+	hx = xx.i[HIWORD] & ~0x80000000;
+
+	/* handle trivial cases */
+	if (hx >= 0x43300000) {	/* x is nan, inf, or already integral */
+		if (hx >= 0x7ff00000)	/* x is inf or nan */
+#if defined(FPADD_TRAPS_INCOMPLETE_ON_NAN)
+			return (hx >= 0x7ff80000 ? x : x + x);
+			/* assumes sparc-like QNaN */
+#else
+			return (x + x);
+#endif
+		return (x);
+	} else if ((hx | xx.i[LOWORD]) == 0)	/* x is zero */
+		return (x);
+
+	/* get the rounding mode */
+	rm = fegetround();
+
+	/* flip the sense of directed roundings if x is negative */
+	if (sx && (rm == FE_UPWARD || rm == FE_DOWNWARD))
+		rm = (FE_UPWARD + FE_DOWNWARD) - rm;
+
+	/* handle |x| < 1 */
+	if (hx < 0x3ff00000) {
+		if (rm == FE_UPWARD || (rm == FE_TONEAREST &&
+			(hx >= 0x3fe00000 && ((hx & 0xfffff) | xx.i[LOWORD]))))
+			xx.i[HIWORD] = sx | 0x3ff00000;
+		else
+			xx.i[HIWORD] = sx;
+		xx.i[LOWORD] = 0;
+		return (xx.d);
+	}
+
+	/* round x at the integer bit */
+	j = 0x433 - (hx >> 20);
+	if (j >= 32) {
+		i = 1 << (j - 32);
+		frac = ((xx.i[HIWORD] << 1) << (63 - j)) |
+			(xx.i[LOWORD] >> (j - 32));
+		if (xx.i[LOWORD] & (i - 1))
+			frac |= 1;
+		if (!frac)
+			return (x);
+		xx.i[LOWORD] = 0;
+		xx.i[HIWORD] &= ~(i - 1);
+		if ((rm == FE_UPWARD) || ((rm == FE_TONEAREST) &&
+			((frac > 0x80000000u) || ((frac == 0x80000000) &&
+			(xx.i[HIWORD] & i)))))
+			xx.i[HIWORD] += i;
+	} else {
+		i = 1 << j;
+		frac = (xx.i[LOWORD] << 1) << (31 - j);
+		if (!frac)
+			return (x);
+		xx.i[LOWORD] &= ~(i - 1);
+		if ((rm == FE_UPWARD) || ((rm == FE_TONEAREST) &&
+			(frac > 0x80000000u || ((frac == 0x80000000) &&
+			(xx.i[LOWORD] & i))))) {
+			xx.i[LOWORD] += i;
+			if (xx.i[LOWORD] == 0)
+				xx.i[HIWORD]++;
+		}
+	}
+	return (xx.d);
+}
+
+#if 0
+
+/*
+*  Alternate implementations for SPARC, x86, using fp ops.  These may
+*  be faster depending on how expensive saving and restoring the fp
+*  modes and status flags is.
+*/
+
+#include "libm.h"
+#include "fma.h"
+
+#if defined(__sparc)
+
+double
+__nearbyint(double x) {
+	union {
+		unsigned i[2];
+		double d;
+	} xx, yy;
+	double z;
+	unsigned hx, sx, fsr, oldfsr;
+	int rm;
+
+	xx.d = x;
+	sx = xx.i[0] & 0x80000000;
+	hx = xx.i[0] & ~0x80000000;
+
+	/* handle trivial cases */
+	if (hx >= 0x43300000)	/* x is nan, inf, or already integral */
+		return (x + 0.0);
+	else if ((hx | xx.i[1]) == 0)	/* x is zero */
+		return (x);
+
+	/* save the fsr */
+	__fenv_getfsr(&oldfsr);
+
+	/* handle |x| < 1 */
+	if (hx < 0x3ff00000) {
+		/* flip the sense of directed roundings if x is negative */
+		rm = oldfsr >> 30;
+		if (sx)
+			rm ^= rm >> 1;
+		if (rm == FSR_RP || (rm == FSR_RN && (hx >= 0x3fe00000 &&
+			((hx & 0xfffff) | xx.i[1]))))
+			xx.i[0] = sx | 0x3ff00000;
+		else
+			xx.i[0] = sx;
+		xx.i[1] = 0;
+		return (xx.d);
+	}
+
+	/* clear the inexact trap */
+	fsr = oldfsr & ~FSR_NXM;
+	__fenv_setfsr(&fsr);
+
+	/* round x at the integer bit */
+	yy.i[0] = sx | 0x43300000;
+	yy.i[1] = 0;
+	z = (x + yy.d) - yy.d;
+
+	/* restore the old fsr */
+	__fenv_setfsr(&oldfsr);
+
+	return (z);
+}
+
+#elif defined(__x86)
+
+/* inline template */
+extern long double frndint(long double);
+
+double
+__nearbyint(double x) {
+	long double z;
+	unsigned oldcwsw, cwsw;
+
+	/* save the control and status words, mask the inexact exception */
+	__fenv_getcwsw(&oldcwsw);
+	cwsw = oldcwsw | 0x00200000;
+	__fenv_setcwsw(&cwsw);
+
+	z = frndint((long double) x);
+
+	/*
+	 * restore the control and status words, preserving all but the
+	 * inexact flag
+	 */
+	__fenv_getcwsw(&cwsw);
+	oldcwsw |= (cwsw & 0x1f);
+	__fenv_setcwsw(&oldcwsw);
+
+	/* note: the value of z is representable in double precision */
+	return (z);
+}
+
+#else
+#error Unknown architecture
+#endif
+
+#endif
