[src/trunk]: src/lib/libm/src more stuff from FreeBSD

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/8765807c79da
branches:  trunk
changeset: 784842:8765807c79da
user:      christos <christos%NetBSD.org@localhost>
date:      Mon Feb 11 01:38:10 2013 +0000

description:
more stuff from FreeBSD

diffstat:

 lib/libm/src/s_frexpl.c  |  62 +++++++++++++++++++++++++++++++++++++++
 lib/libm/src/s_scalbln.c |  76 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 138 insertions(+), 0 deletions(-)

diffs (146 lines):

diff -r 0b0204f53b7c -r 8765807c79da lib/libm/src/s_frexpl.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/libm/src/s_frexpl.c   Mon Feb 11 01:38:10 2013 +0000
@@ -0,0 +1,62 @@
+/*-
+ * Copyright (c) 2004-2005 David Schultz <das%FreeBSD.ORG@localhost>
+ * 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: src/lib/msun/src/s_frexpl.c,v 1.1 2005/03/07 04:54:51 das Exp $
+ */
+
+#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);
+}
diff -r 0b0204f53b7c -r 8765807c79da lib/libm/src/s_scalbln.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/libm/src/s_scalbln.c  Mon Feb 11 01:38:10 2013 +0000
@@ -0,0 +1,76 @@
+/*-
+ * Copyright (c) 2004 David Schultz <das%FreeBSD.ORG@localhost>
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/lib/msun/src/s_scalbln.c,v 1.2 2005/03/07 04:57:50 das Exp $");
+
+#include <limits.h>
+#include <math.h>
+
+double
+scalbln (double x, long n)
+{
+       int in;
+
+       in = (int)n;
+       if (in != n) {
+               if (n > 0)
+                       in = INT_MAX;
+               else
+                       in = INT_MIN;
+       }
+       return (scalbn(x, in));
+}
+
+float
+scalblnf (float x, long n)
+{
+       int in;
+
+       in = (int)n;
+       if (in != n) {
+               if (n > 0)
+                       in = INT_MAX;
+               else
+                       in = INT_MIN;
+       }
+       return (scalbnf(x, in));
+}
+
+long double
+scalblnl (long double x, long n)
+{
+       int in;
+
+       in = (int)n;
+       if (in != n) {
+               if (n > 0)
+                       in = INT_MAX;
+               else
+                       in = INT_MIN;
+       }
+       return (scalbnl(x, (int)n));
+}