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authormrg <mrg@NetBSD.org>2011-07-04 11:22:39 +0000
committermrg <mrg@NetBSD.org>2011-07-04 11:22:39 +0000
commiteb533c43faa1f980277fb2fb6a56c5234dfd3331 (patch)
tree1e51087a67e16bcc05fcd5ab89724116c01f8d39 /lib
parentdabe9235d0b80a6e0a0f5a7c0f8a913d37cdf9a1 (diff)
add support for __floatunsisf().
Diffstat (limited to 'lib')
-rw-r--r--lib/libc/quad/Makefile.inc4
-rw-r--r--lib/libc/quad/floatundisf.c71
2 files changed, 73 insertions, 2 deletions
diff --git a/lib/libc/quad/Makefile.inc b/lib/libc/quad/Makefile.inc
index 022e806e5b5..065275b546f 100644
--- a/lib/libc/quad/Makefile.inc
+++ b/lib/libc/quad/Makefile.inc
@@ -1,9 +1,9 @@
-# $NetBSD: Makefile.inc,v 1.12 2011/07/04 06:23:50 matt Exp $
+# $NetBSD: Makefile.inc,v 1.13 2011/07/04 11:22:39 mrg Exp $
# @(#)Makefile.inc 8.1 (Berkeley) 6/4/93
# Quad support
SRCS.quad= cmpdi2.c divdi3.c fixdfdi.c fixsfdi.c fixunsdfdi.c \
- fixunssfdi.c floatdidf.c floatdisf.c floatundidf.c \
+ fixunssfdi.c floatdidf.c floatdisf.c floatundisf.c floatundidf.c \
moddi3.c muldi3.c negdi2.c qdivrem.c \
ucmpdi2.c udivdi3.c umoddi3.c
diff --git a/lib/libc/quad/floatundisf.c b/lib/libc/quad/floatundisf.c
new file mode 100644
index 00000000000..ab5be920979
--- /dev/null
+++ b/lib/libc/quad/floatundisf.c
@@ -0,0 +1,71 @@
+/* $NetBSD: floatundisf.c,v 1.1 2011/07/04 11:22:39 mrg Exp $ */
+
+/*-
+ * Copyright (c) 1992, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This software was developed by the Computer Systems Engineering group
+ * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
+ * contributed to Berkeley.
+ *
+ * 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.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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>
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)floatdisf.c 8.1 (Berkeley) 6/4/93";
+#else
+__RCSID("$NetBSD: floatundisf.c,v 1.1 2011/07/04 11:22:39 mrg Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include "quad.h"
+
+/*
+ * Convert (unsigned) quad to float.
+ */
+float
+__floatundisf(u_quad_t x)
+{
+ float f;
+ union uu u;
+
+ u.q = x;
+
+ /*
+ * Now u.ul[H] has the factor of 2^32 (or whatever) and u.ul[L]
+ * has the units. Ideally we could just set f, add INT_BITS to
+ * its exponent, and then add the units, but this is portable
+ * code and does not know how to get at an exponent. Machine-
+ * specific code may be able to do this more efficiently.
+ *
+ * Using double here may be excessive paranoia.
+ */
+ f = (double)u.ul[H] * (((int)1 << (INT_BITS - 2)) * 4.0);
+ f += u.ul[L];
+
+ return f;
+}