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, 110 insertions, 0 deletions

diff --git a/usr/src/lib/libm/common/m9x/truncl.c b/usr/src/lib/libm/common/m9x/truncl.c
new file mode 100644
index 0000000000..29f1d6a3a0
--- /dev/null
+++ b/usr/src/lib/libm/common/m9x/truncl.c
@@ -0,0 +1,110 @@
+/*
+ * 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 truncl = __truncl
+#endif
+
+#include "libm.h"
+
+#if defined(__sparc)
+long double
+truncl(long double x) {
+	union {
+		unsigned i[4];
+		long double q;
+	} xx;
+	unsigned hx, sx;
+	int j;
+
+	xx.q = x;
+	sx = xx.i[0] & 0x80000000;
+	hx = xx.i[0] & ~0x80000000;
+
+	/* handle trivial cases */
+	if (hx >= 0x406f0000) /* |x| >= 2^112 + ... or x is nan */
+		return (hx >= 0x7fff0000 ? x + x : x);
+
+	/* handle |x| < 1 */
+	if (hx < 0x3fff0000)
+		return (sx ? -0.0L : 0.0L);
+
+	j = 0x406f - (hx >> 16);		/* 1 <= j <= 112 */
+	xx.i[0] = hx;
+	if (j >= 96) {				/* 96 <= j <= 112 */
+		xx.i[0] &= ~((1 << (j - 96)) - 1);
+		xx.i[1] = xx.i[2] = xx.i[3] = 0;
+	} else if (j >= 64) {			/* 64 <= j <= 95 */
+		xx.i[1] &= ~((1 << (j - 64)) - 1);
+		xx.i[2] = xx.i[3] = 0;
+	} else if (j >= 32) {			/* 32 <= j <= 63 */
+		xx.i[2] &= ~((1 << (j - 32)) - 1);
+		xx.i[3] = 0;
+	} else					/* 1 <= j <= 31 */
+		xx.i[3] &= ~((1 << j) - 1);
+
+	/* negate result if need be */
+	if (sx)
+		xx.i[0] |= 0x80000000;
+	return (xx.q);
+}
+#elif defined(__x86)
+long double
+truncl(long double x) {
+	union {
+		unsigned i[3];
+		long double e;
+	} xx;
+	int ex, sx, i;
+
+	xx.e = x;
+	ex = xx.i[2] & 0x7fff;
+	sx = xx.i[2] & 0x8000;
+	if (ex < 0x403e) {	/* |x| < 2^63 */
+		if (ex < 0x3fff)	/* |x| < 1 */
+			return (sx ? -0.0L : 0.0L);
+
+		/* chop x at the integer bit */
+		if (ex < 0x401e) {
+			i = 1 << (0x401d - ex);
+			xx.i[1] &= ~(i | (i - 1));
+			xx.i[0] = 0;
+		} else {
+			i = 1 << (0x403d - ex);
+			xx.i[0] &= ~(i | (i - 1));
+		}
+		return (xx.e);
+	} else if (ex < 0x7fff)	/* x is integral */
+		return (x);
+	else			/* inf or nan */
+		return (x + x);
+}
+#else
+#error Unknown architecture
+#endif	/* defined(__sparc) || defined(__x86) */