mirror of
https://github.com/lcn2/calc.git
synced 2025-08-16 01:03:29 +03:00
249 lines
8.4 KiB
C
249 lines
8.4 KiB
C
/*
|
|
* zrand - additive 55 shuffle generator
|
|
*
|
|
* Copyright (C) 1999 Landon Curt Noll
|
|
*
|
|
* Calc is open software; you can redistribute it and/or modify it under
|
|
* the terms of the version 2.1 of the GNU Lesser General Public License
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* Calc is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
|
|
* Public License for more details.
|
|
*
|
|
* A copy of version 2.1 of the GNU Lesser General Public License is
|
|
* distributed with calc under the filename COPYING-LGPL. You should have
|
|
* received a copy with calc; if not, write to Free Software Foundation, Inc.
|
|
* 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
* @(#) $Revision: 29.2 $
|
|
* @(#) $Id: zrand.h,v 29.2 2000/06/07 14:02:13 chongo Exp $
|
|
* @(#) $Source: /usr/local/src/cmd/calc/RCS/zrand.h,v $
|
|
*
|
|
* Under source code control: 1995/01/07 09:45:26
|
|
* File existed as early as: 1994
|
|
*
|
|
* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
|
|
* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
|
|
*/
|
|
|
|
/*
|
|
* random number generator - see zrand.c for details
|
|
*/
|
|
|
|
|
|
#if !defined(__ZRAND_H__)
|
|
#define __ZRAND_H__
|
|
|
|
|
|
#include "value.h"
|
|
#include "have_const.h"
|
|
|
|
|
|
/*
|
|
* a55 generator defines
|
|
*
|
|
* NOTE: SBITS must be a power of two to make the (&= (SBITS-1))
|
|
* in slotcp() to work.
|
|
*/
|
|
#define SBITS (64) /* size of additive or shuffle entry in bits */
|
|
#define SBYTES (SBITS/8) /* size of additive or shuffle entry in bytes */
|
|
#define SHALFS (SBYTES/sizeof(HALF)) /* size in HALFs */
|
|
|
|
/*
|
|
* seed defines
|
|
*/
|
|
#define SEEDXORBITS 64 /* low bits of a55 seed devoted to xor */
|
|
|
|
/*
|
|
* shuffle table defines
|
|
*/
|
|
#define SHUFPOW 8 /* power of 2 size of the shuffle table */
|
|
#define SHUFCNT (1 << SHUFPOW) /* size of shuffle table */
|
|
#define SHUFLEN (SLEN*SHUFCNT) /* length of shuffle table in FULLs */
|
|
#define SHUFMASK (SHUFLEN-1) /* mask for shuffle table entry selection */
|
|
|
|
/*
|
|
* additive 55 constants
|
|
*/
|
|
#define A55 55 /* slots in an additive 55 table */
|
|
#define INIT_J 23 /* initial first walking table index */
|
|
#define INIT_K 54 /* initial second walking table index */
|
|
|
|
/*
|
|
* additive 55 table defines
|
|
*
|
|
* SLEN - length in FULLs of an additive 55 slot
|
|
*
|
|
* SVAL(a,b) - form a 64 bit hex slot entry in the additive 55 table
|
|
* a: up to 8 hex digits without the leading 0x (upper half)
|
|
* b: up to 8 hex digits without the leading 0x (lower half)
|
|
*
|
|
* NOTE: Due to a SunOS cc bug, don't put spaces in the SVAL call!
|
|
*
|
|
* SHVAL(a,b,c,d) - form an 64 bit array of HALFs
|
|
* a: up to 4 hex digits without the leading 0x (upper half)
|
|
* b: up to 4 hex digits without the leading 0x (2nd half)
|
|
* c: up to 4 hex digits without the leading 0x (3rd half)
|
|
* d: up to 4 hex digits without the leading 0x (lower half)
|
|
*
|
|
* NOTE: Due to a SunOS cc bug, don't put spaces in the SHVAL call!
|
|
*
|
|
* SLOAD(s,i,z) - load table slot i from additive 55 state s with zvalue z
|
|
* s: type RAND
|
|
* i: type int, s.slot[i] slot index
|
|
* z: type ZVALUE, what to load into s.slot[i]
|
|
*
|
|
* SADD(s,k,j) - slot[k] += slot[j]
|
|
* s: type RAND
|
|
* k: type int, s.slot[k] slot index, what to gets changed
|
|
* j: type int, s.slot[j] slot index, what to add to s.slot[k]
|
|
* (may use local variable tmp)
|
|
*
|
|
* SINDX(s,k) - select the shuffle table entry from slot[k] (uses top bits)
|
|
* s: type RAND
|
|
* k: type int, s.slot[k] slot index, selects shuffle entry
|
|
* result type int, refers to s.shuf[SINDX(s,k)]
|
|
*
|
|
* SBUFFER(s,t) - load a55 buffer with t
|
|
* s: type RAND
|
|
* t: type int, s.shuf[t] entry index, replace buffer with it
|
|
*
|
|
* SSHUF(s,t,k) - save slot[k] into shuffle entry t
|
|
* s: type RAND
|
|
* t: type int, s.shuf[t] entry index, what gets changed
|
|
* k: type int, s.slot[k] slot index, load into s.shuf[t]
|
|
*
|
|
* SSWAP(s,j,k) - swap slot[j] with slot[k]
|
|
* s: type RAND
|
|
* j: type int, s.slot[j] slot index, goes into s.slot[k]
|
|
* k: type int, s.slot[k] slot index, goes into s.slot[j]
|
|
* (uses local variable tmp)
|
|
*
|
|
* SMOD64(t,z) - t = seed z mod 2^64
|
|
* t: type FULL*, array of FULLs that get z mod 2^64
|
|
* z: type ZVALUE, what gets (mod 2^64) placed into t
|
|
*
|
|
* SOXR(s,i,v) - xor slot[i] with lower 64 bits of slot value v
|
|
* s: type RAND
|
|
* i: type int, s.slot[i] slot index, what gets xored
|
|
* v: type FULL*, 64 bit value to xor into s.slot[i]
|
|
*
|
|
* SCNT - length of an additive 55 table in FULLs
|
|
*/
|
|
#if FULL_BITS == SBITS
|
|
|
|
# define SLEN 1 /* a 64 bit slot can be held in a FULL */
|
|
# if defined(FORCE_STDC) || (defined(__STDC__) && __STDC__ != 0) || defined(__cplusplus)
|
|
# define SVAL(a,b) (FULL)U(0x ## a ## b)
|
|
# define SHVAL(a,b,c,d) (HALF)0x ## c ## d, (HALF)0x ## a ## b
|
|
# else
|
|
# define SVAL(a,b) (FULL)U(0x/**/a/**/b)
|
|
# define SHVAL(a,b,c,d) (HALF)0x/**/c/**/d,(HALF)0x/**/a/**/b
|
|
# endif
|
|
#define SLOAD(s,i,z) ((s).slot[i] = ztofull(z))
|
|
#define SADD(s,k,j) ((s).slot[k] += (s).slot[j])
|
|
#define SINDX(s,k) ((int)((s).slot[k] >> (FULL_BITS - SHUFPOW)))
|
|
#define SBUFFER(s,t) {(s).buffer[0] = ((s).shuf[t] & BASE1); \
|
|
(s).buffer[1] = ((s).shuf[t] >> BASEB); \
|
|
}
|
|
#define SSHUF(s,t,k) ((s).shuf[t] = (s).slot[k])
|
|
#define SSWAP(s,j,k) {FULL tmp = (s).slot[j]; \
|
|
(s).slot[j] = (s).slot[k]; \
|
|
(s).slot[k] = tmp; \
|
|
}
|
|
#define SMOD64(t,z) ((t)[0] = ztofull(z))
|
|
#define SXOR(s,i,v) ((s).slot[i] ^= (v)[0])
|
|
|
|
#elif 2*FULL_BITS == SBITS
|
|
|
|
# define SLEN 2 /* a 64 bit slot needs 2 FULLs */
|
|
# if defined(FORCE_STDC) || (defined(__STDC__) && __STDC__ != 0) || defined(__cplusplus)
|
|
# define SVAL(a,b) (FULL)0x##b, (FULL)0x##a
|
|
# define SHVAL(a,b,c,d) (HALF)0x##d, (HALF)0x##c, \
|
|
(HALF)0x##b, (HALF)0x##a
|
|
# else
|
|
/* NOTE: Due to a SunOS cc bug, don't put spaces in the SVAL call! */
|
|
# define SVAL(a,b) (FULL)0x/**/b, (FULL)0x/**/a
|
|
/* NOTE: Due to a SunOS cc bug, don't put spaces in the SHVAL call! */
|
|
# define SHVAL(a,b,c,d) (HALF)0x/**/d, (HALF)0x/**/c, \
|
|
(HALF)0x/**/b, (HALF)0x/**/a
|
|
# endif
|
|
#define SLOAD(s,i,z) {(s).slot[(i)<<1] = ztofull(z); \
|
|
(s).slot[1+((i)<<1)] = \
|
|
(((z).len <= 2) ? (FULL)0 : \
|
|
(((z).len == 3) ? (FULL)((z).v[2]) : \
|
|
((FULL)((z).v[2]) + ((FULL)((z).v[3]) << BASEB)))); \
|
|
}
|
|
#define SADD(s,k,j) {FULL tmp = (s).slot[(k)<<1]; \
|
|
(s).slot[(k)<<1] += (s).slot[(j)<<1]; \
|
|
(s).slot[1+((k)<<1)] += ((tmp <= (s).slot[(k)<<1]) ? \
|
|
(s).slot[1+((j)<<1)] : \
|
|
(s).slot[1+((j)<<1)] + 1); \
|
|
}
|
|
#define SINDX(s,k) ((int)((s).slot[1+((k)<<1)] >> (FULL_BITS - SHUFPOW)))
|
|
#define SBUFFER(s,t) {(s).buffer[0] = ((s).shuf[(t)<<1] & BASE1); \
|
|
(s).buffer[1] = ((s).shuf[(t)<<1] >> BASEB); \
|
|
(s).buffer[2] = ((s).shuf[1+((t)<<1)] & BASE1); \
|
|
(s).buffer[3] = ((s).shuf[1+((t)<<1)] >> BASEB); \
|
|
}
|
|
#define SSHUF(s,t,k) {(s).shuf[(t)<<1] = (s).slot[(k)<<1]; \
|
|
(s).shuf[1+((t)<<1)] = (s).slot[1+((k)<<1)]; \
|
|
}
|
|
#define SSWAP(s,j,k) {FULL tmp = (s).slot[(j)<<1]; \
|
|
(s).slot[(j)<<1] = (s).slot[(k)<<1]; \
|
|
(s).slot[(k)<<1] = tmp; \
|
|
tmp = (s).slot[1+((j)<<1)]; \
|
|
(s).slot[1+((j)<<1)] = (s).slot[1+((k)<<1)]; \
|
|
(s).slot[1+((k)<<1)] = tmp; \
|
|
}
|
|
#define SMOD64(t,z) {(t)[0] = ztofull(z); \
|
|
(t)[1] = (((z).len <= 2) ? (FULL)0 : \
|
|
(((z).len == 3) ? (FULL)((z).v[2]) : \
|
|
((FULL)((z).v[2]) + ((FULL)((z).v[3]) << BASEB)))); \
|
|
}
|
|
#define SXOR(s,i,v) {(s).slot[(i)<<1] ^= (v)[0]; \
|
|
(s).slot[1+((i)<<1)] ^= (v)[1]; \
|
|
}
|
|
|
|
#else
|
|
|
|
/\../\ FULL_BITS must be 32 or 64 /\../\ !!!
|
|
|
|
#endif
|
|
|
|
#define SCNT (SLEN*A55) /* length of additive 55 table in FULLs */
|
|
|
|
|
|
/*
|
|
* a55 generator state
|
|
*/
|
|
struct rand {
|
|
int seeded; /* 1 => state has been seeded */
|
|
int bits; /* buffer bit count */
|
|
FULL buffer[SLEN]; /* unused random bits from last call */
|
|
int j; /* first walking table index */
|
|
int k; /* second walking table index */
|
|
FULL slot[SCNT]; /* additive 55 table */
|
|
FULL shuf[SHUFLEN]; /* shuffle table entries */
|
|
};
|
|
|
|
|
|
/*
|
|
* a55 generator function declarations
|
|
*/
|
|
extern RAND *zsrand(CONST ZVALUE *seed, CONST MATRIX *pmat55);
|
|
extern RAND *zsetrand(CONST RAND *state);
|
|
extern void zrandskip(long count);
|
|
extern void zrand(long count, ZVALUE *res);
|
|
extern void zrandrange(CONST ZVALUE low, CONST ZVALUE beyond, ZVALUE *res);
|
|
extern long irand(long s);
|
|
extern RAND *randcopy(CONST RAND *rand);
|
|
extern void randfree(RAND *rand);
|
|
extern BOOL randcmp(CONST RAND *s1, CONST RAND *s2);
|
|
extern void randprint(CONST RAND *state, int flags);
|
|
|
|
|
|
#endif /* !__ZRAND_H__ */
|