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, 81 insertions, 0 deletions

diff --git a/usr/src/lib/libm/common/R/nextafterf.c b/usr/src/lib/libm/common/R/nextafterf.c
new file mode 100644
index 0000000000..39db44b552
--- /dev/null
+++ b/usr/src/lib/libm/common/R/nextafterf.c
@@ -0,0 +1,81 @@
+/*
+ * 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 nextafterf = __nextafterf
+#endif
+
+#include "libm.h"
+
+float
+nextafterf(float x, float y) {
+	float w;
+	int *pw = (int *) &w;
+	int *px = (int *) &x;
+	int *py = (int *) &y;
+	int ix, iy, iz;
+
+	ix = px[0];
+	iy = py[0];
+	if ((ix & ~0x80000000) > 0x7f800000)
+		return (x * y);		/* + -> * for Cheetah */
+	if ((iy & ~0x80000000) > 0x7f800000)
+		return (y * x);		/* + -> * for Cheetah */
+	if (ix == iy || (ix | iy) == 0x80000000)
+		return (y);		/* C99 requirement */
+	if ((ix & ~0x80000000) == 0)
+		iz = 1 | (iy & 0x80000000);
+	else if (ix > 0) {
+		if (ix > iy)
+			iz = ix - 1;
+		else
+			iz = ix + 1;
+	} else {
+		if (iy < 0 && ix < iy)
+			iz = ix + 1;
+		else
+			iz = ix - 1;
+	}
+	pw[0] = iz;
+	ix = iz & 0x7f800000;
+	if (ix == 0x7f800000) {
+		/* raise overflow */
+		volatile float t;
+
+		*(int *) &t = 0x7f7fffff;
+		t *= t;
+	} else if (ix == 0) {
+		/* raise underflow */
+		volatile float t;
+
+		*(int *) &t = 0x00800000;
+		t *= t;
+	}
+	return (w);
+}