Imported Upstream version 20060131HEADupstream/20060131upstreammaster

1 files changed, 118 insertions, 0 deletions

diff --git a/usr/src/libm/src/Q/nextafterl.c b/usr/src/libm/src/Q/nextafterl.c
new file mode 100644
index 0000000..f1d042f
--- /dev/null
+++ b/usr/src/libm/src/Q/nextafterl.c
@@ -0,0 +1,118 @@
+/*
+ * 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 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"@(#)nextafterl.c	1.3	06/01/31 SMI"
+
+#if defined(ELFOBJ)
+#pragma weak nextafterl = __nextafterl
+#endif
+
+#include "libm.h"
+#include <float.h>		/* LDBL_MAX, LDBL_MIN */
+
+#if defined(__sparc)
+#define	n0	0
+#define	n1	1
+#define	n2	2
+#define	n3	3
+#define	X86PDNRM1(x)
+#define	INC(px)	{ \
+			if (++px[n3] == 0) \
+				if (++px[n2] == 0) \
+					if (++px[n1] == 0) \
+						++px[n0]; \
+		}
+#define	DEC(px)	{ \
+			if (--px[n3] == 0xffffffff) \
+				if (--px[n2] == 0xffffffff) \
+					if (--px[n1] == 0xffffffff) \
+						--px[n0]; \
+		}
+#elif defined(__i386)
+#define	n0	2
+#define	n1	1
+#define	n2	0
+#define	n3	0
+/*
+ * if pseudo-denormal, replace by the equivalent normal
+ */
+#define	X86PDNRM1(x)	if (XBIASED_EXP(x) == 0 && (((int *) &x)[1] & \
+				0x80000000) != 0) \
+				((int *) &x)[2] |= 1
+#define	INC(px)	{ \
+			if (++px[n2] == 0) \
+				if ((++px[n1] & ~0x80000000) == 0) \
+					px[n1] = 0x80000000, ++px[n0]; \
+		}
+#define	DEC(px)	{ \
+			if (--px[n2] == 0xffffffff) \
+				if (--px[n1] == 0x7fffffff) \
+					if ((--px[n0] & 0x7fff) != 0) \
+						px[n1] |= 0x80000000; \
+		}
+#endif
+
+long double
+nextafterl(long double x, long double y) {
+	int *px = (int *) &x;
+	int *py = (int *) &y;
+
+	if (x == y)
+		return (y);		/* C99 requirement */
+	if (x != x || y != y)
+		return (x * y);
+
+	if (ISZEROL(x)) {	/* x == 0.0 */
+		px[n0] = py[n0] & XSGNMSK;
+		px[n1] = px[n2] = 0;
+		px[n3] = 1;
+	} else {
+		X86PDNRM1(x);
+		if ((px[n0] & XSGNMSK) == 0) {	/* x > 0.0 */
+			if (x > y)	/* x > y */
+				DEC(px)
+			else
+				INC(px)
+		} else {
+			if (x < y)	/* x < y */
+				DEC(px)
+			else
+				INC(px)
+		}
+	}
+#ifndef lint
+	{
+		volatile long double dummy;
+		int k = XBIASED_EXP(x);
+
+		if (k == 0)
+			dummy = LDBL_MIN * copysignl(LDBL_MIN, x);
+		else if (k == 0x7fff)
+			dummy = LDBL_MAX * copysignl(LDBL_MAX, x);
+	}
+#endif
+	return (x);
+}