;redcode-94x
;name Exsnail
;author Philip Thorne
;strategy Qb. bi-bomber. D. Van Dam inspired clear. [Axed Snail clear]
;strategy 1.02a Minor fixes/changes + mild pspace defense. Testing...
; internal This was on 94x hill June 2002 thru Mar 2003 - died age 72

for CORESIZE==8000
;assert (CORESIZE==8000)
;assert (MAXLENGTH==100) && (MINDISTANCE==100)
;assert (MAXCYCLES==80000)
;assert (MAXPROCESSES>=8)
STEP    EQU     (-3288)              ;1504:32 1424:16 1490:10 1432:8
ANTIMP  EQU     1143
rof

for CORESIZE==55440
;assert (CORESIZE==55440) 
;assert (MAXPROCESSES>=8)
;assert (MAXCYCLES==500000)
;assert (MAXLENGTH==200) && (MINDISTANCE==200)
STEP    EQU     (-20344)            ;12104, 24184, 21256, 20344 & 22952
ANTIMP  EQU     34117               ;35873
rof

MSIZ    EQU     (8)
PTR     EQU     (fang+STEP)
MSPACE  EQU     for MSIZ
        EQU         dat 0,  0
        EQU     rof

sptr    EQU     vdptr     ;Use Van Dam's
inc     EQU     pit

;assert (STEP % MSIZ) == 0

fang:   spl     *STEP-(fang-PTR)+(STEP*(CORESIZE/MSIZ)/2),   -STEP-(STEP*(CORESIZE/MSIZ)/2)
vamp:   mov.i   fang,               >fang
        mov.i   vbmb,               }fang
        add.f   inc,                fang
        jmz     vamp,               PTR
evamp:  jmp     sclr

    for MSIZ-(evamp-fang+1)
        dat     0,                  0
    rof
;===
        MSPACE
        MSPACE
;===
; This was posted to rgc by someone for Bjoern Guenzel who recomended it
; as a good type of clear origniating from David Van Dam. Similar but less
; involved than the latter's TheCoreClear. Slight changes for Large hill.
;
; More to the point better than my own zclearL (esp vs stones & imps).

for 1                                   ;### Van Dam - start
sclr    EQU     first
gate    EQU     -800
OFF     EQU     (last-vdptr+2)

        dat     0,                  0
;vdptr:  dat     -5,                 ((dclr+2)-last) +2 + (MAXLENGTH)
vdptr:  dat     -5,                 (MAXLENGTH)
        dat     0,                  0
        dat     0,                  0
first:  spl     #0,                 >gate
        mov.i   *bptr,              >vdptr
        djn.f   -1,                 {vdptr
        dat     0,                  0
;===
        dat     0,                  0   ;maybe put another 5 here as is
                                        ;needs djn to hit next (dangerous)
bptr:   dat     1,                  last-vdptr+2
for CORESIZE==8000
last:   spl     #-10-44+11+2,       last-vdptr+2
rof
for CORESIZE==55440
last:   spl     #-OFF-98,           OFF
rof
        dat     0,                  0
        dat     0,                  0
        dat     0,                  0
        dat     0,                  0
        dat     0,                  0
rof                                     ;### Van Dam - end
;===

        MSPACE
;==
        dat     0,                  0
        dat     0,                  0
pit:    spl     #STEP-1,            #-STEP-1
        spl     pit2,               >PTR
        spl     #0,                 #0
rip:    spl     -1,                 {(CORESIZE/4)
        spl     -1,                 >-1
        jmp     pit
;==
        MSPACE
;==
        dat     0,                  0
pit2:
M   for MSIZ-5
        spl     #0,                 #0
    rof
;    for (PSPACESIZE > 1)
;        stp.b   +1,                 vdptr
;        spl     -1,                 >rip
;    rof
;    for (PSPACESIZE < 2)
        spl     #0,                 #0
        spl     -1,                 >rip
;    rof
        jmp     pit2

    for MSIZ-2
        dat     0,                  0
    rof
;==

vbmb:   dat     >1,                 }2
ptr:    spl     pit-PTR,            0
boot:   mov.i   ptr,                PTR
        mov.i   pit2,               PTR-1

for 1
for CORESIZE==8000
JCNT    EQU     (18)		;(2)
rof
for CORESIZE==55440
JCNT    EQU     (118)
rof
JSTEP   EQU     ((CORESIZE - MAXLENGTH) / JCNT)
J   for JCNT
        mov.i   vbmb,               <(JSTEP*J)+(MAXLENGTH-vamp)
    rof
        jmp     vamp
rof

    end boot