1 files changed, 83 insertions, 0 deletions
diff --git a/usr/src/lib/libm/common/m9x/lround.c b/usr/src/lib/libm/common/m9x/lround.c
new file mode 100644
index 0000000000..f09463f35e
--- /dev/null
+++ b/usr/src/lib/libm/common/m9x/lround.c
@@ -0,0 +1,83 @@
+/*
+ * 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 lround = __lround
+#endif
+
+/*
+ * lround(x) rounds its argument to the nearest integer, rounding ties
+ * away from zero, and converts the result to a 32 bit signed integer.
+ *
+ * If x is NaN, infinite, or so large that the nearest integer
+ * would exceed 32 bits, the invalid operation exception is raised.
+ */
+
+#include <sys/isa_defs.h>	/* _ILP32 */
+#include "libm.h"
+
+#if defined(_ILP32)
+long
+lround(double x) {
+	union {
+		unsigned i[2];
+		double d;
+	} xx;
+	unsigned hx, sx, i;
+
+	xx.d = x;
+	hx = xx.i[HIWORD] & ~0x80000000;
+	sx = xx.i[HIWORD] & 0x80000000;
+	if (hx < 0x43300000) {	/* |x| < 2^52 */
+		if (hx < 0x3ff00000) {	/* |x| < 1 */
+			if (hx >= 0x3fe00000)
+				return (sx ? -1L : 1L);
+			return (0L);
+		}
+
+		/* round x at the integer bit */
+		if (hx < 0x41300000) {
+			i = 1 << (0x412 - (hx >> 20));
+			xx.i[HIWORD] = (xx.i[HIWORD] + i) & ~(i | (i - 1));
+			xx.i[LOWORD] = 0;
+		} else {
+			i = 1 << (0x432 - (hx >> 20));
+			xx.i[LOWORD] += i;
+			if (xx.i[LOWORD] < i)
+				xx.i[HIWORD]++;
+			xx.i[LOWORD] &= ~(i | (i - 1));
+		}
+	}
+
+	/* now x is nan, inf, or integral */
+	return ((long) xx.d);
+}
+#else
+#error Unsupported architecture
+#endif	/* defined(_ILP32) */