693 Opensource replacement of sunwlibm

Reviewed by: Igor Kozhukhov ikozhukhov@gmail.com
Reviewed by: Keith M Wesolowski <keith.wesolowski@joyent.com>
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Approved by: Dan McDonald <danmcd@omniti.com>

1 files changed, 73 insertions, 0 deletions

diff --git a/usr/src/lib/libm/common/m9x/llroundf.c b/usr/src/lib/libm/common/m9x/llroundf.c
new file mode 100644
index 0000000000..a1756b5b32
--- /dev/null
+++ b/usr/src/lib/libm/common/m9x/llroundf.c
@@ -0,0 +1,73 @@
+/*
+ * 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 llroundf = __llroundf
+#if defined(__sparcv9) || defined(__amd64)
+#pragma weak lroundf = __llroundf
+#pragma weak __lroundf = __llroundf
+#endif
+#endif
+
+#include "libm.h"
+
+long long
+llroundf(float x) {
+	union {
+		unsigned i;
+		float f;
+	} xx;
+	unsigned hx, sx, i;
+
+	xx.f = x;
+	hx = xx.i & ~0x80000000;
+	sx = xx.i & 0x80000000;
+
+	if (hx < 0x4b000000) { /* |x| < 2^23 */
+		/* handle |x| < 1 */
+		if (hx < 0x3f800000) {
+			if (hx >= 0x3f000000)
+				return (sx ? -1LL : 1LL);
+			return (0LL);
+		}
+
+		/* round x at the integer bit */
+		i = 1 << (0x95 - (hx >> 23));
+		xx.i = (xx.i + i) & ~((i << 1) - 1);
+
+		/*
+		 * on LP32 architectures, we can just convert x to a 32-bit
+		 * integer and sign-extend it
+		 */
+		return ((long) xx.f);
+	}
+
+	/* now x is nan, inf, or integral */
+	return ((long long) x);
+}