1 files changed, 88 insertions, 0 deletions
diff --git a/usr/src/lib/libm/common/Q/remainderl.c b/usr/src/lib/libm/common/Q/remainderl.c
new file mode 100644
index 0000000000..82d47328ca
--- /dev/null
+++ b/usr/src/lib/libm/common/Q/remainderl.c
@@ -0,0 +1,88 @@
+/*
+ * 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 remainderl = __remainderl
+
+#include "libm.h"
+#include "longdouble.h"
+
+/*
+ * remainderl(x,p)
+ *	returns  x REM p  =  x - [x/p]*p as if in infinite
+ *	precise arithmetic, where [x/p] is the (inifinite bit)
+ *	integer nearest x/p (in half way case choose the even one).
+ * Method :
+ *	Based on fmodl() return x-[x/p]chopped*p exactly.
+ */
+
+#define	HFMAX	5.948657476786158825428796633140035080982e+4931L
+#define	DBMIN	6.724206286224187012525355634643505205196e-4932L
+
+static const long double
+	zero = 0.0L,
+	half = 0.5L,
+	hfmax = HFMAX,	/* half of the maximum number */
+	dbmin = DBMIN;	/* double of the minimum (normal) number */
+
+long double
+remainderl(long double x, long double p) {
+	long double hp;
+	int sx;
+
+	if (isnanl(p))
+		return (x + p);
+	if (!finitel(x))
+		return (x - x);
+	p = fabsl(p);
+	if (p <= hfmax)
+		x = fmodl(x, p + p);
+	sx = signbitl(x);
+	x = fabsl(x);
+	if (p < dbmin) {
+		if (x + x > p) {
+			if (x == p)
+				x = zero;
+			else
+				x -= p;	/* avoid x-x=-0 in RM mode */
+			if (x + x >= p)
+				x -= p;
+		}
+	} else {
+		hp = half * p;
+		if (x > hp) {
+			if (x == p)
+				x = zero;
+			else
+				x -= p;	/* avoid x-x=-0 in RM mode */
+			if (x >= hp)
+				x -= p;
+		}
+	}
+	return (sx == 0 ? x : -x);
+}