1 files changed, 93 insertions, 0 deletions
diff --git a/usr/src/lib/libm/common/m9x/modf.c b/usr/src/lib/libm/common/m9x/modf.c
new file mode 100644
index 0000000000..636bb2967d
--- /dev/null
+++ b/usr/src/lib/libm/common/m9x/modf.c
@@ -0,0 +1,93 @@
+/*
+ * 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 modf = __modf
+#pragma weak _modf = __modf
+#endif
+
+/*
+ * modf(x, iptr) decomposes x into an integral part and a fractional
+ * part both having the same sign as x.  It stores the integral part
+ * in *iptr and returns the fractional part.
+ *
+ * If x is infinite, modf sets *iptr to x and returns copysign(0.0,x).
+ * If x is NaN, modf sets *iptr to x and returns x.
+ *
+ * If x is a signaling NaN, this code does not attempt to raise the
+ * invalid operation exception.
+ */
+
+#include "libm.h"
+
+double
+__modf(double x, double *iptr) {
+	union {
+		unsigned i[2];
+		double d;
+	} xx, yy;
+	unsigned hx, s;
+
+	xx.d = x;
+	hx = xx.i[HIWORD] & ~0x80000000;
+
+	if (hx >= 0x43300000) {	/* x is NaN, infinite, or integral */
+		*iptr = x;
+		if (hx < 0x7ff00000 || (hx == 0x7ff00000 &&
+			xx.i[LOWORD] == 0)) {
+			xx.i[HIWORD] &= 0x80000000;
+			xx.i[LOWORD] = 0;
+		}
+		return (xx.d);
+	}
+
+	if (hx < 0x3ff00000) {	/* |x| < 1 */
+		xx.i[HIWORD] &= 0x80000000;
+		xx.i[LOWORD] = 0;
+		*iptr = xx.d;
+		return (x);
+	}
+
+	/* split x at the binary point */
+	s = xx.i[HIWORD] & 0x80000000;
+	if (hx < 0x41400000) {
+		yy.i[HIWORD] = xx.i[HIWORD] & ~((1 << (0x413 - (hx >> 20))) -
+			1);
+		yy.i[LOWORD] = 0;
+	} else {
+		yy.i[HIWORD] = xx.i[HIWORD];
+		yy.i[LOWORD] = xx.i[LOWORD] & ~((1 << (0x433 - (hx >> 20))) -
+			1);
+	}
+	*iptr = yy.d;
+	xx.d -= yy.d;
+	xx.i[HIWORD] = (xx.i[HIWORD] & ~0x80000000) | s;
+							/* keep sign of x */
+	return (xx.d);
+}