1 files changed, 70 insertions, 0 deletions
diff --git a/usr/src/lib/libm/common/m9x/trunc.c b/usr/src/lib/libm/common/m9x/trunc.c
new file mode 100644
index 0000000000..381000bbd8
--- /dev/null
+++ b/usr/src/lib/libm/common/m9x/trunc.c
@@ -0,0 +1,70 @@
+/*
+ * 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 trunc = __trunc
+#endif
+
+#include "libm.h"
+
+double
+trunc(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 */
+			return (sx ? -0.0 : 0.0);
+
+		/* chop x at the integer bit */
+		if (hx < 0x41300000) {
+			i = 1 << (0x412 - (hx >> 20));
+			xx.i[HIWORD] &= ~(i | (i - 1));
+			xx.i[LOWORD] = 0;
+		} else {
+			i = 1 << (0x432 - (hx >> 20));
+			xx.i[LOWORD] &= ~(i | (i - 1));
+		}
+		return (xx.d);
+	} else if (hx < 0x7ff00000)
+		return (x);
+	else
+#if defined(FPADD_TRAPS_INCOMPLETE_ON_NAN)
+		return (hx >= 0x7ff80000 ? x : x + x);
+		/* assumes sparc-like QNaN */
+#else
+		return (x + x);
+#endif
+}