From e0fe8e44407ab4c59902f18d6542f1faa6ba1d58 Mon Sep 17 00:00:00 2001
From: David Schultz <das@FreeBSD.org>
Date: Mon, 7 Mar 2005 04:54:51 +0000
Subject: [PATCH] Implement frexpl.

---
 lib/msun/src/s_frexpl.c | 62 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 lib/msun/src/s_frexpl.c

diff --git a/lib/msun/src/s_frexpl.c b/lib/msun/src/s_frexpl.c
new file mode 100644
index 000000000000..d34f55d9f4f8
--- /dev/null
+++ b/lib/msun/src/s_frexpl.c
@@ -0,0 +1,62 @@
+/*-
+ * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <float.h>
+#include <math.h>
+
+#include "fpmath.h"
+
+#if LDBL_MAX_EXP != 0x4000
+#error "Unsupported long double format"
+#endif
+
+long double
+frexpl(long double x, int *ex)
+{
+	union IEEEl2bits u;
+
+	u.e = x;
+	switch (u.bits.exp) {
+	case 0:		/* 0 or subnormal */
+		if ((u.bits.manl | u.bits.manh) == 0) {
+			*ex = 0;
+		} else {
+			u.e *= 0x1.0p514;
+			*ex = u.bits.exp - 0x4200;
+			u.bits.exp = 0x3ffe;
+		}
+		break;
+	case 0x7fff:	/* infinity or NaN; value of *ex is unspecified */
+		break;
+	default:	/* normal */
+		*ex = u.bits.exp - 0x3ffe;
+		u.bits.exp = 0x3ffe;
+		break;
+	}
+	return (u.e);
+}