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186
zrand.h
186
zrand.h
@@ -9,7 +9,7 @@
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*
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* Calc is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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* Public License for more details.
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*
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* A copy of version 2.1 of the GNU Lesser General Public License is
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@@ -17,11 +17,11 @@
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* received a copy with calc; if not, write to Free Software Foundation, Inc.
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Under source code control: 1995/01/07 09:45:26
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* File existed as early as: 1994
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* Under source code control: 1995/01/07 09:45:26
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* File existed as early as: 1994
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*
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* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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*/
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/*
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@@ -33,7 +33,7 @@
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#define INCLUDE_ZRAND_H
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#if defined(CALC_SRC) /* if we are building from the calc source tree */
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#if defined(CALC_SRC) /* if we are building from the calc source tree */
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# include "value.h"
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# include "have_const.h"
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#else
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@@ -46,145 +46,145 @@
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* s100 generator defines
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*
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* NOTE: SBITS must be a power of two to make the (&= (SBITS-1))
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* in slotcp() to work.
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* in slotcp() to work.
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*/
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#define SBITS (64) /* size of subtractive or shuffle entry in bits */
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#define SBITS (64) /* size of subtractive or shuffle entry in bits */
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#define SBYTES (SBITS/8) /* size of subtractive or shuffle entry in bytes */
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#define SHALFS (SBYTES/sizeof(HALF)) /* size in HALFs */
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#define SHALFS (SBYTES/sizeof(HALF)) /* size in HALFs */
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/*
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* seed defines
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*/
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#define SEEDXORBITS 64 /* low bits of s100 seed devoted to xor */
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#define SEEDXORBITS 64 /* low bits of s100 seed devoted to xor */
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/*
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* shuffle table defines
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*/
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#define SHUFPOW 8 /* power of 2 size of the shuffle table */
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#define SHUFCNT (1 << SHUFPOW) /* size of shuffle table */
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#define SHUFLEN (SLEN*SHUFCNT) /* length of shuffle table in FULLs */
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#define SHUFMASK (SHUFLEN-1) /* mask for shuffle table entry selection */
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#define SHUFPOW 8 /* power of 2 size of the shuffle table */
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#define SHUFCNT (1 << SHUFPOW) /* size of shuffle table */
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#define SHUFLEN (SLEN*SHUFCNT) /* length of shuffle table in FULLs */
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#define SHUFMASK (SHUFLEN-1) /* mask for shuffle table entry selection */
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/*
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* subtractive 100 constants
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*/
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#define S100 100 /* slots in an subtractive 100 table */
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#define INIT_J 36 /* initial first walking table index */
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#define INIT_K 99 /* initial second walking table index */
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#define S100 100 /* slots in an subtractive 100 table */
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#define INIT_J 36 /* initial first walking table index */
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#define INIT_K 99 /* initial second walking table index */
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/*
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* subtractive 100 table defines
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*
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* SLEN - length in FULLs of an subtractive 100 slot
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* SLEN - length in FULLs of an subtractive 100 slot
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*
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* SLOAD(s,i,z) - load table slot i from subtractive 100 state s with zvalue z
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* s: type RAND
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* i: type int, s.slot[i] slot index
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* z: type ZVALUE, what to load into s.slot[i]
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* s: type RAND
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* i: type int, s.slot[i] slot index
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* z: type ZVALUE, what to load into s.slot[i]
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*
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* SSUB(s,k,j) - slot[k] -= slot[j]
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* s: type RAND
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* k: type int, s.slot[k] slot index, what to gets changed
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* j: type int, s.slot[j] slot index, what to add to s.slot[k]
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* (may use local variable tmp)
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* SSUB(s,k,j) - slot[k] -= slot[j]
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* s: type RAND
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* k: type int, s.slot[k] slot index, what to gets changed
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* j: type int, s.slot[j] slot index, what to add to s.slot[k]
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* (may use local variable tmp)
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*
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* SINDX(s,k) - select the shuffle table entry from slot[k] (uses top bits)
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* s: type RAND
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* k: type int, s.slot[k] slot index, selects shuffle entry
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* result type int, refers to s.shuf[SINDX(s,k)]
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* SINDX(s,k) - select the shuffle table entry from slot[k] (uses top bits)
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* s: type RAND
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* k: type int, s.slot[k] slot index, selects shuffle entry
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* result type int, refers to s.shuf[SINDX(s,k)]
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*
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* SBUFFER(s,t) - load s100 buffer with t
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* s: type RAND
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* t: type int, s.shuf[t] entry index, replace buffer with it
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* s: type RAND
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* t: type int, s.shuf[t] entry index, replace buffer with it
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*
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* SSHUF(s,t,k) - save slot[k] into shuffle entry t
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* s: type RAND
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* t: type int, s.shuf[t] entry index, what gets changed
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* k: type int, s.slot[k] slot index, load into s.shuf[t]
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* s: type RAND
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* t: type int, s.shuf[t] entry index, what gets changed
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* k: type int, s.slot[k] slot index, load into s.shuf[t]
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*
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* SSWAP(s,j,k) - swap slot[j] with slot[k]
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* s: type RAND
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* j: type int, s.slot[j] slot index, goes into s.slot[k]
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* k: type int, s.slot[k] slot index, goes into s.slot[j]
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* (uses local variable tmp)
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* s: type RAND
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* j: type int, s.slot[j] slot index, goes into s.slot[k]
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* k: type int, s.slot[k] slot index, goes into s.slot[j]
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* (uses local variable tmp)
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*
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* SMOD64(t,z) - t = seed z mod 2^64
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* t: type FULL*, array of FULLs that get z mod 2^64
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* z: type ZVALUE, what gets (mod 2^64) placed into t
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* SMOD64(t,z) - t = seed z mod 2^64
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* t: type FULL*, array of FULLs that get z mod 2^64
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* z: type ZVALUE, what gets (mod 2^64) placed into t
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*
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* SOXR(s,i,v) - xor slot[i] with lower 64 bits of slot value v
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* s: type RAND
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* i: type int, s.slot[i] slot index, what gets xored
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* v: type FULL*, 64 bit value to xor into s.slot[i]
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* SOXR(s,i,v) - xor slot[i] with lower 64 bits of slot value v
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* s: type RAND
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* i: type int, s.slot[i] slot index, what gets xored
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* v: type FULL*, 64 bit value to xor into s.slot[i]
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*
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* SCNT - length of an subtractive 100 table in FULLs
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* SCNT - length of an subtractive 100 table in FULLs
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*/
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#if FULL_BITS == SBITS
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# define SLEN 1 /* a 64 bit slot can be held in a FULL */
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# define SLEN 1 /* a 64 bit slot can be held in a FULL */
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#define SLOAD(s,i,z) ((s).slot[i] = ztofull(z))
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#define SSUB(s,k,j) ((s).slot[k] -= (s).slot[j])
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#define SINDX(s,k) ((int)((s).slot[k] >> (FULL_BITS - SHUFPOW)))
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#define SBUFFER(s,t) {(s).buffer[0] = ((s).shuf[t] & BASE1); \
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(s).buffer[1] = ((s).shuf[t] >> BASEB); \
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}
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(s).buffer[1] = ((s).shuf[t] >> BASEB); \
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}
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#define SSHUF(s,t,k) ((s).shuf[t] = (s).slot[k])
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#define SSWAP(s,j,k) {FULL tmp = (s).slot[j]; \
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(s).slot[j] = (s).slot[k]; \
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(s).slot[k] = tmp; \
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}
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(s).slot[j] = (s).slot[k]; \
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(s).slot[k] = tmp; \
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}
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#define SMOD64(t,z) ((t)[0] = ztofull(z))
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#define SXOR(s,i,v) ((s).slot[i] ^= (v)[0])
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#elif 2*FULL_BITS == SBITS
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# define SLEN 2 /* a 64 bit slot needs 2 FULLs */
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# define SLEN 2 /* a 64 bit slot needs 2 FULLs */
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#define SLOAD(s,i,z) {(s).slot[(i)<<1] = ztofull(z); \
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(s).slot[1+((i)<<1)] = \
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(((z).len <= 2) ? (FULL)0 : \
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(((z).len == 3) ? (FULL)((z).v[2]) : \
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((FULL)((z).v[2]) + ((FULL)((z).v[3]) << BASEB)))); \
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}
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(s).slot[1+((i)<<1)] = \
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(((z).len <= 2) ? (FULL)0 : \
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(((z).len == 3) ? (FULL)((z).v[2]) : \
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((FULL)((z).v[2]) + ((FULL)((z).v[3]) << BASEB)))); \
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}
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#define SSUB(s,k,j) {FULL tmp = (s).slot[(k)<<1]; \
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(s).slot[(k)<<1] -= (s).slot[(j)<<1]; \
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(s).slot[1+((k)<<1)] -= ((tmp <= (s).slot[(k)<<1]) ? \
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(s).slot[1+((j)<<1)] : \
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(s).slot[1+((j)<<1)] + 1); \
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}
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(s).slot[(k)<<1] -= (s).slot[(j)<<1]; \
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(s).slot[1+((k)<<1)] -= ((tmp <= (s).slot[(k)<<1]) ? \
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(s).slot[1+((j)<<1)] : \
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(s).slot[1+((j)<<1)] + 1); \
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}
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#define SINDX(s,k) ((int)((s).slot[1+((k)<<1)] >> (FULL_BITS - SHUFPOW)))
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#define SBUFFER(s,t) {(s).buffer[0] = ((s).shuf[(t)<<1] & BASE1); \
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(s).buffer[1] = ((s).shuf[(t)<<1] >> BASEB); \
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(s).buffer[2] = ((s).shuf[1+((t)<<1)] & BASE1); \
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(s).buffer[3] = ((s).shuf[1+((t)<<1)] >> BASEB); \
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}
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(s).buffer[1] = ((s).shuf[(t)<<1] >> BASEB); \
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(s).buffer[2] = ((s).shuf[1+((t)<<1)] & BASE1); \
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(s).buffer[3] = ((s).shuf[1+((t)<<1)] >> BASEB); \
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}
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#define SSHUF(s,t,k) {(s).shuf[(t)<<1] = (s).slot[(k)<<1]; \
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(s).shuf[1+((t)<<1)] = (s).slot[1+((k)<<1)]; \
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}
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(s).shuf[1+((t)<<1)] = (s).slot[1+((k)<<1)]; \
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}
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#define SSWAP(s,j,k) {FULL tmp = (s).slot[(j)<<1]; \
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(s).slot[(j)<<1] = (s).slot[(k)<<1]; \
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(s).slot[(k)<<1] = tmp; \
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tmp = (s).slot[1+((j)<<1)]; \
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(s).slot[1+((j)<<1)] = (s).slot[1+((k)<<1)]; \
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(s).slot[1+((k)<<1)] = tmp; \
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}
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(s).slot[(j)<<1] = (s).slot[(k)<<1]; \
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(s).slot[(k)<<1] = tmp; \
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tmp = (s).slot[1+((j)<<1)]; \
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(s).slot[1+((j)<<1)] = (s).slot[1+((k)<<1)]; \
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(s).slot[1+((k)<<1)] = tmp; \
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}
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#define SMOD64(t,z) {(t)[0] = ztofull(z); \
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(t)[1] = (((z).len <= 2) ? (FULL)0 : \
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(((z).len == 3) ? (FULL)((z).v[2]) : \
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((FULL)((z).v[2]) + ((FULL)((z).v[3]) << BASEB)))); \
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}
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(t)[1] = (((z).len <= 2) ? (FULL)0 : \
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(((z).len == 3) ? (FULL)((z).v[2]) : \
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((FULL)((z).v[2]) + ((FULL)((z).v[3]) << BASEB)))); \
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}
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#define SXOR(s,i,v) {(s).slot[(i)<<1] ^= (v)[0]; \
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(s).slot[1+((i)<<1)] ^= (v)[1]; \
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}
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(s).slot[1+((i)<<1)] ^= (v)[1]; \
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}
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#else
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/\../\ FULL_BITS must be 32 or 64 /\../\ !!!
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/\../\ FULL_BITS must be 32 or 64 /\../\ !!!
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#endif
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#define SCNT (SLEN*S100) /* length of subtractive 100 table in FULLs */
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#define SCNT (SLEN*S100) /* length of subtractive 100 table in FULLs */
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#define RAND_CONSEQ_USE (100) /* use this many before skipping */
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#define RAND_CONSEQ_USE (100) /* use this many before skipping */
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#define RAND_SKIP (1009-RAND_CONSEQ_USE) /* skip this many after use */
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@@ -192,14 +192,14 @@
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* s100 generator state
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*/
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struct rand {
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int seeded; /* 1 => state has been seeded */
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int bits; /* buffer bit count */
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FULL buffer[SLEN]; /* unused random bits from last call */
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int j; /* first walking table index */
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int k; /* second walking table index */
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int need_to_skip; /* 1 => skip the next 909 values */
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FULL slot[SCNT]; /* subtractive 100 table */
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FULL shuf[SHUFLEN]; /* shuffle table entries */
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int seeded; /* 1 => state has been seeded */
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int bits; /* buffer bit count */
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FULL buffer[SLEN]; /* unused random bits from last call */
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int j; /* first walking table index */
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int k; /* second walking table index */
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int need_to_skip; /* 1 => skip the next 909 values */
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FULL slot[SCNT]; /* subtractive 100 table */
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FULL shuf[SHUFLEN]; /* shuffle table entries */
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};
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