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match.s
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;===========================================================================
; Copyright (c) 1990-1999 Info-ZIP. All rights reserved.
;
; See the accompanying file LICENSE, version 1999-Oct-05 or later
; (the contents of which are also included in zip.h) for terms of use.
; If, for some reason, both of these files are missing, the Info-ZIP license
; also may be found at: ftp://ftp.cdrom.com/pub/infozip/license.html
;===========================================================================
; match.s for ARM by Sergio Monesi.
r0 RN 0
r1 RN 1
r2 RN 2
r3 RN 3
r4 RN 4
r5 RN 5
r6 RN 6
r7 RN 7
r8 RN 8
r9 RN 9
sl RN 10
fp RN 11
ip RN 12
sp RN 13
lr RN 14
pc RN 15
MAX_DIST EQU 32506
WMASK EQU 32767
MAX_MATCH EQU 258
AREA |C$$code|, CODE, READONLY
; r1 = chain_lenght
; r2 = scan
; r3 = match
; r4 = len (tmp)
; r5 = best_len
; r6 = limit
; r7 = strend
; r8 = scan_end1
; r9 = scan_end
; lr = window
; fp = prev
|__max_chain_length|
IMPORT max_chain_length
DCD max_chain_length
|__window|
IMPORT window
DCD window
|__prev|
IMPORT prev
DCD prev
|__prev_length|
IMPORT prev_length
DCD prev_length
|__strstart|
IMPORT strstart
DCD strstart
|__good_match|
IMPORT good_match
DCD good_match
|__nice_match|
IMPORT nice_match
DCD nice_match
|__match_start|
IMPORT match_start
DCD match_start
DCB "longest_match"
DCB &00,&00,&00
DCD &ff000010
EXPORT longest_match
longest_match
STMFD sp!, {r4-r9,fp,lr}
LDR fp, [pc, #|__prev|-.-8]
LDR r1, [pc, #|__max_chain_length|-.-8]
LDR r1, [r1]
LDR lr, [pc, #|__window|-.-8]
LDR ip, [pc, #|__strstart|-.-8]
LDR ip, [ip]
ADD r2, lr, ip
LDR r5, [pc, #|__prev_length|-.-8]
LDR r5, [r5]
SUBS ip, ip, #MAX_DIST-250 ; if r6 > MAX_DIST
SUBCSS r6, ip, #250 ; r6 = r6 - MAXDIST
MOVLS r6, #0 ; else r6 = 0
ADD r7, r2, #MAX_MATCH-256
ADD r7, r7, #256 ; r7 = r2 + MAX_MATCH (=258);
SUB ip, r5, #1
LDRB r8, [r2, ip]
LDRB r9, [r2, r5]
LDR ip, [pc, #|__good_match|-.-8]
LDR ip, [ip]
CMP r5, ip
MOVCS r1, r1, LSR #2
cycle
ADD r3, lr, r0
LDRB ip, [r3, r5]
CMP ip, r9
BNE cycle_end
SUB ip, r5, #1
LDRB ip, [r3, ip]
CMP ip, r8
BNE cycle_end
LDRB ip, [r2]
LDRB r4, [r3]
CMP ip, r4
BNE cycle_end
LDRB ip, [r3, #1]
LDRB r4, [r2, #1]
CMP ip, r4
BNE cycle_end
ADD r2, r2, #2
ADD r3, r3, #2
inn_cycle
LDRB ip, [r2, #1]!
LDRB r4, [r3, #1]!
CMP ip, r4
BNE exit_inn_cycle
LDRB ip, [r2, #1]!
LDRB r4, [r3, #1]!
CMP ip, r4
BNE exit_inn_cycle
LDRB ip, [r2, #1]!
LDRB r4, [r3, #1]!
CMP ip, r4
BNE exit_inn_cycle
LDRB ip, [r2, #1]!
LDRB r4, [r3, #1]!
CMP ip, r4
BNE exit_inn_cycle
LDRB ip, [r2, #1]!
LDRB r4, [r3, #1]!
CMP ip, r4
BNE exit_inn_cycle
LDRB ip, [r2, #1]!
LDRB r4, [r3, #1]!
CMP ip, r4
BNE exit_inn_cycle
LDRB ip, [r2, #1]!
LDRB r4, [r3, #1]!
CMP ip, r4
BNE exit_inn_cycle
LDRB ip, [r2, #1]!
LDRB r4, [r3, #1]!
CMP ip, r4
BNE exit_inn_cycle
CMP r2, r7
BCC inn_cycle
exit_inn_cycle
SUB r4, r2, r7 ; len = MAX_MATCH - (int)(strend - scan);
ADD r4, r4, #MAX_MATCH-256
ADD r4, r4, #256
SUB r2, r2, r4 ; scan = strend - MAX_MATCH
CMP r4, r5 ; if (len > best_len) {
BLE cycle_end
LDR ip, [pc, #|__match_start|-.-8] ; match_start = cur_match;
STR r0, [ip]
MOV r5, r4 ; best_len = len;
LDR ip, [pc, #|__nice_match|-.-8] ; if (len >= nice_match)
LDR ip, [ip]
CMP r4, ip
BGE exit_match ; break;
SUB ip, r5, #1 ; scan_end1 = scan[best_len-1];
LDRB r8, [r2, ip]
LDRB r9, [r2, r5] ; scan_end = scan[best_len];
cycle_end
MOV ip, r0, LSL #17 ; cur_match & WMASK
MOV ip, ip, LSR #17
LDR r0, [fp, ip, ASL #1] ; cur_match = prev[cur_match & WMASK]
MOV r0, r0, ASL #16
MOV r0, r0, LSR #16
CMP r0, r6 ; cur_match > limit
BLS exit_match
SUBS r1, r1, #1 ; --chain_length
BNE cycle ; chain_length != 0
exit_match
MOV r0, r5
LDMFD sp!, {r4-r9,fp,pc}^
END