1 2 /* : : generated by proto : : */ 3 /*********************************************************************** 4 * * 5 * This software is part of the ast package * 6 * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 7 * and is licensed under the * 8 * Common Public License, Version 1.0 * 9 * by AT&T Knowledge Ventures * 10 * * 11 * A copy of the License is available at * 12 * http://www.opensource.org/licenses/cpl1.0.txt * 13 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 14 * * 15 * Information and Software Systems Research * 16 * AT&T Research * 17 * Florham Park NJ * 18 * * 19 * Glenn Fowler <gsf@research.att.com> * 20 * David Korn <dgk@research.att.com> * 21 * Phong Vo <kpv@research.att.com> * 22 * * 23 ***********************************************************************/ 24 25 /* 26 * K. P. Vo 27 * G. S. Fowler 28 * AT&T Research 29 * 30 * ``the best'' combined linear congruent checksum/hash/PRNG 31 */ 32 33 #ifndef _HASHPART_H 34 #if !defined(__PROTO__) 35 #include <prototyped.h> 36 #endif 37 #if !defined(__LINKAGE__) 38 #define __LINKAGE__ /* 2004-08-11 transition */ 39 #endif 40 41 #define _HASHPART_H 42 43 #define HASH_ADD(h) (0x9c39c33dL) 44 45 #if __sparc__ || __sparc || sparc 46 47 #define HASH_A(h,n) ((((h) << 2) - (h)) << (n)) 48 #define HASH_B(h,n) ((((h) << 4) - (h)) << (n)) 49 #define HASH_C(h,n) ((HASH_A(h,7) + HASH_B(h,0)) << (n)) 50 #define HASH_MPY(h) (HASH_C(h,22)+HASH_C(h,10)+HASH_A(h,6)+HASH_A(h,3)+(h)) 51 52 #else 53 54 #define HASH_MPY(h) ((h)*0x63c63cd9L) 55 56 #endif 57 58 #define HASHPART(h,c) (h = HASH_MPY(h) + HASH_ADD(h) + (c)) 59 60 #endif 61