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, 53 insertions, 0 deletions

diff --git a/usr/src/lib/libm/common/complex/carg.c b/usr/src/lib/libm/common/complex/carg.c
new file mode 100644
index 0000000000..a79bca005b
--- /dev/null
+++ b/usr/src/lib/libm/common/complex/carg.c
@@ -0,0 +1,53 @@
+/*
+ * 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 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma weak carg = __carg
+
+#include "libm_synonyms.h"
+#include <math.h>		/* atan2 */
+#include "complex_wrapper.h"
+
+static const double
+	pi	= 3.14159265358979311600e+00,
+	pi_lo	= 1.22464679914735320717e-16;
+
+double
+carg(dcomplex z) {
+	int	ix, iy;
+
+	ix = ((int *)&(D_RE(z)))[HIWORD];
+	iy = ((int *)&(D_IM(z)))[HIWORD];
+	if ((((ix | iy) & ~0x80000000) | ((int *)&(D_RE(z)))[LOWORD] |
+	    ((int *)&(D_IM(z)))[LOWORD]) == 0) {
+		/* x and y are both zero */
+		if (ix == 0)
+			return (D_IM(z));
+		return ((iy == 0)? pi + pi_lo : -pi - pi_lo);
+	}
+	return (atan2(D_IM(z), D_RE(z)));
+}