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, 70 insertions, 0 deletions

diff --git a/usr/src/lib/libm/common/m9x/frexpf.c b/usr/src/lib/libm/common/m9x/frexpf.c
new file mode 100644
index 0000000000..7a89fbb428
--- /dev/null
+++ b/usr/src/lib/libm/common/m9x/frexpf.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 frexpf = __frexpf
+#endif
+
+#include "libm.h"
+
+float
+__frexpf(float x, int *exp) {
+	union {
+		unsigned i;
+		float f;
+	} xx;
+	unsigned hx;
+	int e;
+
+	xx.f = x;
+	hx = xx.i & ~0x80000000;
+
+	if (hx >= 0x7f800000) { /* x is infinite or NaN */
+		*exp = 0;
+		return (x);
+	}
+
+	e = 0;
+	if (hx < 0x00800000) { /* x is subnormal or zero */
+		if (hx == 0) {
+			*exp = 0;
+			return (x);
+		}
+
+		/* normalize x by regarding it as an integer */
+		xx.f = (int) xx.i < 0 ? -(int) hx : (int) hx;
+		hx = xx.i & ~0x80000000;
+		e = -149;
+	}
+
+	/* now xx.f is normal */
+	xx.i = (xx.i & ~0x7f800000) | 0x3f000000;
+	*exp = e + (hx >> 23) - 0x7e;
+	return (xx.f);
+}