[src/trunk]: src/lib/libc/gen Add __floatunsi{sd}f for IEEE754.

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

details:   https://anonhg.NetBSD.org/src/rev/656a230bce06
branches:  trunk
changeset: 789586:656a230bce06
user:      matt <matt%NetBSD.org@localhost>
date:      Fri Aug 23 16:01:35 2013 +0000

description:
Add __floatunsi{sd}f for IEEE754.
Unlike the quad versions, these don't use floating point.

diffstat:

 lib/libc/gen/floatunsidf_ieee754.c |  67 ++++++++++++++++++++++++++++++++++++++
 lib/libc/gen/floatunsisf_ieee754.c |  66 +++++++++++++++++++++++++++++++++++++
 2 files changed, 133 insertions(+), 0 deletions(-)

diffs (141 lines):

diff -r 58c97a37ec16 -r 656a230bce06 lib/libc/gen/floatunsidf_ieee754.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/libc/gen/floatunsidf_ieee754.c        Fri Aug 23 16:01:35 2013 +0000
@@ -0,0 +1,67 @@
+/*     $NetBSD: floatunsidf_ieee754.c,v 1.1 2013/08/23 16:01:35 matt Exp $     */
+
+/*-
+ * Copyright (c) 2013 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matt Thomas of 3am Software Foundry.
+ *
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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)
+__RCSID("$NetBSD: floatunsidf_ieee754.c,v 1.1 2013/08/23 16:01:35 matt Exp $");
+#endif /* LIBC_SCCS and not lint */
+
+#if defined(SOFTFLOAT) || defined(__ARM_EABI__)
+#include "softfloat/softfloat-for-gcc.h"
+#endif
+
+#include <machine/ieee.h>
+
+double __floatunsidf(uint32_t);
+
+/*
+ * Convert (unsigned) int to double.
+ */
+double
+__floatunsidf(uint32_t x)
+{
+       union ieee_double_u u;
+
+       if (x == 0)
+               return 0.0;
+       if (x == 1)
+               return 1.0;
+
+       u_int l = __builtin_clz(x);
+       x <<= (l + 1);  /* clear implicit bit */
+
+       u.dblu_sign = 0;
+       u.dblu_exp = DBL_EXP_BIAS + 31 - l;
+       u.dblu_frach = x >> (32 - DBL_FRACHBITS);
+       u.dblu_fracl = x << (32 - DBL_FRACHBITS);
+
+       return u.dblu_d;
+}
diff -r 58c97a37ec16 -r 656a230bce06 lib/libc/gen/floatunsisf_ieee754.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/libc/gen/floatunsisf_ieee754.c        Fri Aug 23 16:01:35 2013 +0000
@@ -0,0 +1,66 @@
+/*     $NetBSD: floatunsisf_ieee754.c,v 1.1 2013/08/23 16:01:35 matt Exp $     */
+
+/*-
+ * Copyright (c) 2013 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matt Thomas of 3am Software Foundry.
+ *
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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)
+__RCSID("$NetBSD: floatunsisf_ieee754.c,v 1.1 2013/08/23 16:01:35 matt Exp $");
+#endif /* LIBC_SCCS and not lint */
+
+#if defined(SOFTFLOAT) || defined(__ARM_EABI__)
+#include "softfloat/softfloat-for-gcc.h"
+#endif
+
+#include <machine/ieee.h>
+
+float __floatunsisf(uint32_t);
+
+/*
+ * Convert (unsigned) int to float.
+ */
+float
+__floatunsisf(uint32_t x)
+{
+       union ieee_single_u u;
+
+       if (x == 0)
+               return 0.0;
+       if (x == 1)
+               return 1.0;
+
+       u_int l = __builtin_clz(x);
+       x <<= (l + 1);  /* clear implicit bit */
+
+       u.sngu_sign = 0;
+       u.sngu_exp = SNG_EXP_BIAS + 31 - l;
+       u.sngu_frac = x >> (32 - SNG_FRACBITS);
+
+       return u.sngu_f;
+}