Imported Upstream version 93u+upstream

1 files changed, 51 insertions, 0 deletions

diff --git a/src/lib/libast/include/hashpart.h b/src/lib/libast/include/hashpart.h
new file mode 100644
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--- /dev/null
+++ b/src/lib/libast/include/hashpart.h
@@ -0,0 +1,51 @@
+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
+*                      and is licensed under the                       *
+*                 Eclipse Public License, Version 1.0                  *
+*                    by AT&T Intellectual Property                     *
+*                                                                      *
+*                A copy of the License is available at                 *
+*          http://www.eclipse.org/org/documents/epl-v10.html           *
+*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
+*                                                                      *
+*              Information and Software Systems Research               *
+*                            AT&T Research                             *
+*                           Florham Park NJ                            *
+*                                                                      *
+*                 Glenn Fowler <gsf@research.att.com>                  *
+*                  David Korn <dgk@research.att.com>                   *
+*                   Phong Vo <kpv@research.att.com>                    *
+*                                                                      *
+***********************************************************************/
+#pragma prototyped
+/*
+ * K. P. Vo
+ * G. S. Fowler
+ * AT&T Research
+ *
+ * ``the best'' combined linear congruent checksum/hash/PRNG
+ */
+
+#ifndef _HASHPART_H
+#define _HASHPART_H
+
+#define HASH_ADD(h)	(0x9c39c33dL)
+
+#if __sparc__ || __sparc || sparc
+
+#define HASH_A(h,n)	((((h) << 2) - (h)) << (n))
+#define HASH_B(h,n)	((((h) << 4) - (h)) << (n))
+#define HASH_C(h,n)	((HASH_A(h,7) + HASH_B(h,0)) << (n))
+#define HASH_MPY(h)	(HASH_C(h,22)+HASH_C(h,10)+HASH_A(h,6)+HASH_A(h,3)+(h))
+
+#else
+
+#define HASH_MPY(h)	((h)*0x63c63cd9L)
+
+#endif
+
+#define HASHPART(h,c)	(h = HASH_MPY(h) + HASH_ADD(h) + (c))
+
+#endif