Implement and document nan(), nanf(), and nanl(). This commit

adds two new directories in msun: ld80 and ld128. These are for
long double functions specific to the 80-bit long double format
used on x86-derived architectures, and the 128-bit format used on
sparc64, respectively.

2 files changed, 71 insertions, 1 deletions

diff --git a/lib/msun/src/math.h b/lib/msun/src/math.h
index a5d16c5..fc281c9 100644
--- a/lib/msun/src/math.h
+++ b/lib/msun/src/math.h
@@ -238,6 +238,7 @@ double	log1p(double);
 double	logb(double);
 long	lrint(double);
 long	lround(double);
+double	nan(const char *) __pure2;
 double	nextafter(double, double);
 double	remainder(double, double);
 double	remquo(double, double, int *);
@@ -341,6 +342,7 @@ long long llrintf(float);
 long long llroundf(float);
 long	lrintf(float);
 long	lroundf(float);
+float	nanf(const char *) __pure2;
 float	nearbyintf(float);
 float	nextafterf(float, float);
 float	remainderf(float, float);
@@ -435,13 +437,15 @@ long double	log10l(long double);
 long double	log1pl(long double);
 long double	log2l(long double);
 long double	logbl(long double);
+#endif
 long double	logl(long double);
+#if 0
 long		lrintl(long double);
 #endif
 long		lroundl(long double);
 long double	modfl(long double, long double *); /* fundamentally !__pure2 */
-#if 0
 long double	nanl(const char *) __pure2;
+#if 0
 long double	nearbyintl(long double);
 #endif
 long double	nextafterl(long double, long double);
diff --git a/lib/msun/src/s_nan.c b/lib/msun/src/s_nan.c
new file mode 100644
index 0000000..10014f6
--- /dev/null
+++ b/lib/msun/src/s_nan.c
@@ -0,0 +1,66 @@
+/*-
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <float.h>
+#include <math.h>
+
+#include "../../../contrib/gdtoa/gdtoaimp.h"
+#include "math_private.h"
+
+double
+nan(const char *s)
+{
+	static FPI fpi = { 52, -1074, 971, 1, SI };
+
+	double result;
+	ULong bits[2];
+
+	s--;
+	hexnan(&s, &fpi, bits);
+	SET_HIGH_WORD(result, 0x7ff80000 | bits[1]);
+	SET_LOW_WORD(result, bits[0]);
+	return (result);
+}
+
+float
+nanf(const char *s)
+{
+	static FPI fpi = { 24, -149, 104, 1, SI };
+
+	float result;
+	ULong bits[1];
+
+	s--;
+	hexnan(&s, &fpi, bits);
+	SET_FLOAT_WORD(result, 0x7fc00000 | bits[0]);
+	return (result);
+}
+
+#if (LDBL_MANT_DIG == 53)
+__weak_reference(nan, nanl);
+#endif