[src/trunk]: src/lib/libm/src add FreeBSD implementations.

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

details:   https://anonhg.NetBSD.org/src/rev/cb6e6d007edc
branches:  trunk
changeset: 784789:cb6e6d007edc
user:      christos <christos%NetBSD.org@localhost>
date:      Sat Feb 09 19:37:48 2013 +0000

description:
add FreeBSD implementations.

diffstat:

 lib/libm/src/s_nan.c       |  114 +++++++++++++++++++++++++++++++++++++++++++++
 lib/libm/src/s_nearbyint.c |   61 ++++++++++++++++++++++++
 2 files changed, 175 insertions(+), 0 deletions(-)

diffs (183 lines):

diff -r d64bf2322935 -r cb6e6d007edc lib/libm/src/s_nan.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/libm/src/s_nan.c      Sat Feb 09 19:37:48 2013 +0000
@@ -0,0 +1,114 @@
+/*     $NetBSD: s_nan.c,v 1.1 2013/02/09 19:37:48 christos Exp $       */
+
+/*-
+ * Copyright (c) 2007 David Schultz
+ * 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 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 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_nan.c,v 1.2 2007/12/18 23:46:32 das Exp $
+ */
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: s_nan.c,v 1.1 2013/02/09 19:37:48 christos Exp $");
+
+#include <sys/endian.h>
+#include <ctype.h>
+#include <float.h>
+#include <math.h>
+#include <stdint.h>
+#include <strings.h>
+
+#include "math_private.h"
+
+/*
+ * Scan a string of hexadecimal digits (the format nan(3) expects) and
+ * make a bit array (using the local endianness). We stop when we
+ * encounter an invalid character, NUL, etc.  If we overflow, we do
+ * the same as gcc's __builtin_nan(), namely, discard the high order bits.
+ *
+ * The format this routine accepts needs to be compatible with what is used
+ * in contrib/gdtoa/hexnan.c (for strtod/scanf) and what is used in
+ * __builtin_nan(). In fact, we're only 100% compatible for strings we
+ * consider valid, so we might be violating the C standard. But it's
+ * impossible to use nan(3) portably anyway, so this seems good enough.
+ */
+void
+_scan_nan(uint32_t *words, int num_words, const char *s)
+{
+       int si;         /* index into s */
+       int bitpos;     /* index into words (in bits) */
+
+       bzero(words, num_words * sizeof(uint32_t));
+
+       /* Allow a leading '0x'. (It's expected, but redundant.) */
+       if (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'))
+               s += 2;
+
+       /* Scan forwards in the string, looking for the end of the sequence. */
+       for (si = 0; isxdigit(s[si]); si++)
+               ;
+
+       /* Scan backwards, filling in the bits in words[] as we go. */
+#if _BYTE_ORDER == _LITTLE_ENDIAN
+       for (bitpos = 0; bitpos < 32 * num_words; bitpos += 4) {
+#else
+       for (bitpos = 32 * num_words - 4; bitpos >= 0; bitpos -= 4) {
+#endif
+               if (--si < 0)
+                       break;
+               words[bitpos / 32] |= digittoint(s[si]) << (bitpos % 32);
+       }
+}
+
+double
+nan(const char *s)
+{
+       union {
+               double d;
+               uint32_t bits[2];
+       } u;
+
+       _scan_nan(u.bits, 2, s);
+#if _BYTE_ORDER == _LITTLE_ENDIAN
+       u.bits[1] |= 0x7ff80000;
+#else
+       u.bits[0] |= 0x7ff80000;
+#endif
+       return (u.d);
+}
+
+float
+nanf(const char *s)
+{
+       union {
+               float f;
+               uint32_t bits[1];
+       } u;
+
+       _scan_nan(u.bits, 1, s);
+       u.bits[0] |= 0x7fc00000;
+       return (u.f);
+}
+
+#if (LDBL_MANT_DIG == 53)
+__weak_reference(nan, nanl);
+#endif
diff -r d64bf2322935 -r cb6e6d007edc lib/libm/src/s_nearbyint.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/libm/src/s_nearbyint.c        Sat Feb 09 19:37:48 2013 +0000
@@ -0,0 +1,61 @@
+/*     $NetBSD: s_nearbyint.c,v 1.1 2013/02/09 19:37:48 christos Exp $ */
+
+/*-
+ * 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>
+#if 0
+__FBSDID("$FreeBSD: src/lib/msun/src/s_nearbyint.c,v 1.2 2008/01/14 02:12:06 das Exp $");
+#else
+__RCSID("$NetBSD: s_nearbyint.c,v 1.1 2013/02/09 19:37:48 christos Exp $");
+#endif
+
+#include <fenv.h>
+#include <math.h>
+
+/*
+ * We save and restore the floating-point environment to avoid raising
+ * an inexact exception.  We can get away with using fesetenv()
+ * instead of feclearexcept()/feupdateenv() to restore the environment
+ * because the only exception defined for rint() is overflow, and
+ * rounding can't overflow as long as emax >= p.
+ */
+#define        DECL(type, fn, rint)    \
+type                           \
+fn(type x)                     \
+{                              \
+       type ret;               \
+       fenv_t env;             \
+                               \
+       fegetenv(&env);         \
+       ret = rint(x);          \
+       fesetenv(&env);         \
+       return (ret);           \
+}
+
+DECL(double, nearbyint, rint)
+DECL(float, nearbyintf, rintf)
+DECL(long double, nearbyintl, rintl)