initial import

1 files changed, 87 insertions, 0 deletions

diff --git a/sysdeps/generic/rint.c b/sysdeps/generic/rint.c
new file mode 100644
index 0000000000..a26fd09620
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+++ b/sysdeps/generic/rint.c
@@ -0,0 +1,87 @@
+/* snarfed from BSD common_source/floor.c:
+ * Copyright (c) 1985, 1995 Regents of the University of California.
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)floor.c	5.7 (Berkeley) 10/9/90";
+#endif /* not lint */
+
+#include "mathimpl.h"
+
+vc(L, 4503599627370496.0E0 ,0000,5c00,0000,0000, 55, 1.0) /* 2**55 */
+
+ic(L, 4503599627370496.0E0, 52, 1.0)			  /* 2**52 */
+
+#ifdef vccast
+#define	L	vccast(L)
+#endif
+
+/*
+ * algorithm for rint(x) in pseudo-pascal form ...
+ *
+ * real rint(x): real x;
+ *	... delivers integer nearest x in direction of prevailing rounding
+ *	... mode
+ * const	L = (last consecutive integer)/2
+ * 	  = 2**55; for VAX D
+ * 	  = 2**52; for IEEE 754 Double
+ * real	s,t;
+ * begin
+ * 	if x != x then return x;		... NaN
+ * 	if |x| >= L then return x;		... already an integer
+ * 	s := copysign(L,x);
+ * 	t := x + s;				... = (x+s) rounded to integer
+ * 	return t - s
+ * end;
+ *
+ * Note: Inexact will be signaled if x is not an integer, as is
+ *	customary for IEEE 754.  No other signal can be emitted.
+ */
+double
+__rint(x)
+double x;
+{
+	double s,t;
+	const double one = 1.0;
+
+#if !defined(vax)&&!defined(tahoe)
+	if (x != x)				/* NaN */
+		return (x);
+#endif	/* !defined(vax)&&!defined(tahoe) */
+	if (copysign(x,one) >= L)		/* already an integer */
+	    return (x);
+	s = copysign(L,x);
+	t = x + s;				/* x+s rounded to integer */
+	return (t - s);
+}
+
+weak_alias (__rint, rint)