mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
66422f5b7a
under way to move the remnants of the a.out toolchain to ports. As the comment in src/Makefile said, this stuff is deprecated and one should not expect this to remain beyond 4.0-REL. It has already lasted WAY beyond that. Notable exceptions: gcc - I have not touched the a.out generation stuff there. ldd/ldconfig - still have some code to interface with a.out rtld. old as/ld/etc - I have not removed these yet, pending their move to ports. some includes - necessary for ldd/ldconfig for now. Tested on: i386 (extensively), alpha
380 lines
12 KiB
ArmAsm
380 lines
12 KiB
ArmAsm
/* match.s -- optional optimized asm version of longest match in deflate.c
|
|
* Copyright (C) 1992-1993 Jean-loup Gailly
|
|
* This is free software; you can redistribute it and/or modify it under the
|
|
* terms of the GNU General Public License, see the file COPYING.
|
|
*
|
|
* The 68020 version has been written by Francesco Potorti` <pot@cnuce.cnr.it>
|
|
* with adaptations by Carsten Steger <stegerc@informatik.tu-muenchen.de>,
|
|
* Andreas Schwab <schwab@lamothe.informatik.uni-dortmund.de> and
|
|
* Kristoffer Eriksson <ske@pkmab.se>
|
|
*/
|
|
|
|
/* $FreeBSD$ */
|
|
|
|
/* Preprocess with -DNO_UNDERLINE if your C compiler does not prefix
|
|
* external symbols with an underline character '_'.
|
|
*/
|
|
#ifdef NO_UNDERLINE
|
|
# define _prev prev
|
|
# define _window window
|
|
# define _match_start match_start
|
|
# define _prev_length prev_length
|
|
# define _good_match good_match
|
|
# define _nice_match nice_match
|
|
# define _strstart strstart
|
|
# define _max_chain_length max_chain_length
|
|
|
|
# define _match_init match_init
|
|
# define _longest_match longest_match
|
|
#endif
|
|
|
|
#ifdef DYN_ALLOC
|
|
error: DYN_ALLOC not yet supported in match.s
|
|
#endif
|
|
|
|
#if defined(i386) || defined(_I386) || defined(__i386__)
|
|
|
|
/* This version is for 386 Unix or OS/2 in 32 bit mode.
|
|
* Warning: it uses the AT&T syntax: mov source,dest
|
|
* This file is only optional. If you want to force the C version,
|
|
* add -DNO_ASM to CFLAGS in Makefile and set OBJA to an empty string.
|
|
* If you have reduced WSIZE in gzip.h, then change its value below.
|
|
* This version assumes static allocation of the arrays (-DDYN_ALLOC not used).
|
|
*/
|
|
|
|
.file "match.S"
|
|
|
|
#define MAX_MATCH 258
|
|
#define MAX_MATCH2 $128 /* MAX_MATCH/2-1 */
|
|
#define MIN_MATCH 3
|
|
#define WSIZE $32768
|
|
#define MAX_DIST WSIZE - MAX_MATCH - MIN_MATCH - 1
|
|
|
|
.globl _match_init
|
|
.globl _longest_match
|
|
|
|
.text
|
|
|
|
_match_init:
|
|
ret
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Set match_start to the longest match starting at the given string and
|
|
* return its length. Matches shorter or equal to prev_length are discarded,
|
|
* in which case the result is equal to prev_length and match_start is
|
|
* garbage.
|
|
* IN assertions: cur_match is the head of the hash chain for the current
|
|
* string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1
|
|
*/
|
|
|
|
_longest_match: /* int longest_match(cur_match) */
|
|
|
|
#define cur_match 20(%esp)
|
|
/* return address */ /* esp+16 */
|
|
push %ebp /* esp+12 */
|
|
push %edi /* esp+8 */
|
|
push %esi /* esp+4 */
|
|
push %ebx /* esp */
|
|
|
|
/*
|
|
* match equ esi
|
|
* scan equ edi
|
|
* chain_length equ ebp
|
|
* best_len equ ebx
|
|
* limit equ edx
|
|
*/
|
|
mov cur_match,%esi
|
|
mov _max_chain_length,%ebp /* chain_length = max_chain_length */
|
|
mov _strstart,%edi
|
|
mov %edi,%edx
|
|
sub MAX_DIST,%edx /* limit = strstart-MAX_DIST */
|
|
jae limit_ok
|
|
sub %edx,%edx /* limit = NIL */
|
|
limit_ok:
|
|
add $2+_window,%edi /* edi = offset(window+strstart+2) */
|
|
mov _prev_length,%ebx /* best_len = prev_length */
|
|
movw -3(%ebx,%edi),%ax /* ax = scan[best_len-1..best_len] */
|
|
movw -2(%edi),%cx /* cx = scan[0..1] */
|
|
cmp _good_match,%ebx /* do we have a good match already? */
|
|
jb do_scan
|
|
shr $2,%ebp /* chain_length >>= 2 */
|
|
jmp do_scan
|
|
|
|
.align 4
|
|
long_loop:
|
|
/* at this point, edi == scan+2, esi == cur_match */
|
|
movw -3(%ebx,%edi),%ax /* ax = scan[best_len-1..best_len] */
|
|
movw -2(%edi),%cx /* cx = scan[0..1] */
|
|
short_loop:
|
|
/*
|
|
* at this point, di == scan+2, si == cur_match,
|
|
* ax = scan[best_len-1..best_len] and cx = scan[0..1]
|
|
*/
|
|
and WSIZE-1, %esi
|
|
movw _prev(%esi,%esi),%si /* cur_match = prev[cur_match] */
|
|
/* top word of esi is still 0 */
|
|
cmp %edx,%esi /* cur_match <= limit ? */
|
|
jbe the_end
|
|
dec %ebp /* --chain_length */
|
|
jz the_end
|
|
do_scan:
|
|
cmpw _window-1(%ebx,%esi),%ax/* check match at best_len-1 */
|
|
jne short_loop
|
|
cmpw _window(%esi),%cx /* check min_match_length match */
|
|
jne short_loop
|
|
|
|
lea _window+2(%esi),%esi /* si = match */
|
|
mov %edi,%eax /* ax = scan+2 */
|
|
mov MAX_MATCH2,%ecx /* scan for at most MAX_MATCH bytes */
|
|
rep; cmpsw /* loop until mismatch */
|
|
je maxmatch /* match of length MAX_MATCH? */
|
|
mismatch:
|
|
movb -2(%edi),%cl /* mismatch on first or second byte? */
|
|
subb -2(%esi),%cl /* cl = 0 if first bytes equal */
|
|
xchg %edi,%eax /* edi = scan+2, eax = end of scan */
|
|
sub %edi,%eax /* eax = len */
|
|
sub %eax,%esi /* esi = cur_match + 2 + offset(window) */
|
|
sub $2+_window,%esi /* esi = cur_match */
|
|
subb $1,%cl /* set carry if cl == 0 (cannot use DEC) */
|
|
adc $0,%eax /* eax = carry ? len+1 : len */
|
|
cmp %ebx,%eax /* len > best_len ? */
|
|
jle long_loop
|
|
mov %esi,_match_start /* match_start = cur_match */
|
|
mov %eax,%ebx /* ebx = best_len = len */
|
|
cmp _nice_match,%eax /* len >= nice_match ? */
|
|
jl long_loop
|
|
the_end:
|
|
mov %ebx,%eax /* result = eax = best_len */
|
|
pop %ebx
|
|
pop %esi
|
|
pop %edi
|
|
pop %ebp
|
|
ret
|
|
maxmatch:
|
|
cmpsb
|
|
jmp mismatch
|
|
|
|
#else
|
|
|
|
/* ======================== 680x0 version ================================= */
|
|
|
|
#if defined(m68k)||defined(mc68k)||defined(__mc68000__)||defined(__MC68000__)
|
|
# ifndef mc68000
|
|
# define mc68000
|
|
# endif
|
|
#endif
|
|
|
|
#if defined(__mc68020__) || defined(__MC68020__) || defined(sysV68)
|
|
# ifndef mc68020
|
|
# define mc68020
|
|
# endif
|
|
#endif
|
|
|
|
#if defined(mc68020) || defined(mc68000)
|
|
|
|
#if (defined(mc68020) || defined(NeXT)) && !defined(UNALIGNED_OK)
|
|
# define UNALIGNED_OK
|
|
#endif
|
|
|
|
#ifdef sysV68 /* Try Motorola Delta style */
|
|
|
|
# define GLOBAL(symbol) global symbol
|
|
# define TEXT text
|
|
# define FILE(filename) file filename
|
|
# define invert_maybe(src,dst) dst,src
|
|
# define imm(data) &data
|
|
# define reg(register) %register
|
|
|
|
# define addl add.l
|
|
# define addql addq.l
|
|
# define blos blo.b
|
|
# define bhis bhi.b
|
|
# define bras bra.b
|
|
# define clrl clr.l
|
|
# define cmpmb cmpm.b
|
|
# define cmpw cmp.w
|
|
# define cmpl cmp.l
|
|
# define lslw lsl.w
|
|
# define lsrl lsr.l
|
|
# define movel move.l
|
|
# define movew move.w
|
|
# define moveb move.b
|
|
# define moveml movem.l
|
|
# define subl sub.l
|
|
# define subw sub.w
|
|
# define subql subq.l
|
|
|
|
# define IndBase(bd,An) (bd,An)
|
|
# define IndBaseNdxl(bd,An,Xn) (bd,An,Xn.l)
|
|
# define IndBaseNdxw(bd,An,Xn) (bd,An,Xn.w)
|
|
# define predec(An) -(An)
|
|
# define postinc(An) (An)+
|
|
|
|
#else /* default style (Sun 3, NeXT, Amiga, Atari) */
|
|
|
|
# define GLOBAL(symbol) .globl symbol
|
|
# define TEXT .text
|
|
# define FILE(filename) .even
|
|
# define invert_maybe(src,dst) src,dst
|
|
# if defined(sun) || defined(mc68k)
|
|
# define imm(data) #data
|
|
# else
|
|
# define imm(data) \#data
|
|
# endif
|
|
# define reg(register) register
|
|
|
|
# define blos bcss
|
|
# if defined(sun) || defined(mc68k)
|
|
# define movel movl
|
|
# define movew movw
|
|
# define moveb movb
|
|
# endif
|
|
# define IndBase(bd,An) An@(bd)
|
|
# define IndBaseNdxl(bd,An,Xn) An@(bd,Xn:l)
|
|
# define IndBaseNdxw(bd,An,Xn) An@(bd,Xn:w)
|
|
# define predec(An) An@-
|
|
# define postinc(An) An@+
|
|
|
|
#endif /* styles */
|
|
|
|
#define Best_Len reg(d0) /* unsigned */
|
|
#define Cur_Match reg(d1) /* Ipos */
|
|
#define Loop_Counter reg(d2) /* int */
|
|
#define Scan_Start reg(d3) /* unsigned short */
|
|
#define Scan_End reg(d4) /* unsigned short */
|
|
#define Limit reg(d5) /* IPos */
|
|
#define Chain_Length reg(d6) /* unsigned */
|
|
#define Scan_Test reg(d7)
|
|
#define Scan reg(a0) /* *uch */
|
|
#define Match reg(a1) /* *uch */
|
|
#define Prev_Address reg(a2) /* *Pos */
|
|
#define Scan_Ini reg(a3) /* *uch */
|
|
#define Match_Ini reg(a4) /* *uch */
|
|
#define Stack_Pointer reg(sp)
|
|
|
|
#define MAX_MATCH 258
|
|
#define MIN_MATCH 3
|
|
#define WSIZE 32768
|
|
#define MAX_DIST (WSIZE - MAX_MATCH - MIN_MATCH - 1)
|
|
|
|
GLOBAL (_match_init)
|
|
GLOBAL (_longest_match)
|
|
|
|
TEXT
|
|
|
|
FILE ("match.S")
|
|
|
|
_match_init:
|
|
rts
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Set match_start to the longest match starting at the given string and
|
|
* return its length. Matches shorter or equal to prev_length are discarded,
|
|
* in which case the result is equal to prev_length and match_start is
|
|
* garbage.
|
|
* IN assertions: cur_match is the head of the hash chain for the current
|
|
* string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1
|
|
*/
|
|
|
|
/* int longest_match (cur_match) */
|
|
|
|
#ifdef UNALIGNED_OK
|
|
# define pushreg 15928 /* d2-d6/a2-a4 */
|
|
# define popreg 7292
|
|
#else
|
|
# define pushreg 16184 /* d2-d7/a2-a4 */
|
|
# define popreg 7420
|
|
#endif
|
|
|
|
_longest_match:
|
|
movel IndBase(4,Stack_Pointer),Cur_Match
|
|
moveml imm(pushreg),predec(Stack_Pointer)
|
|
movel _max_chain_length,Chain_Length
|
|
movel _prev_length,Best_Len
|
|
movel imm(_prev),Prev_Address
|
|
movel imm(_window+MIN_MATCH),Match_Ini
|
|
movel _strstart,Limit
|
|
movel Match_Ini,Scan_Ini
|
|
addl Limit,Scan_Ini
|
|
subw imm(MAX_DIST),Limit
|
|
bhis L__limit_ok
|
|
clrl Limit
|
|
L__limit_ok:
|
|
cmpl invert_maybe(_good_match,Best_Len)
|
|
blos L__length_ok
|
|
lsrl imm(2),Chain_Length
|
|
L__length_ok:
|
|
subql imm(1),Chain_Length
|
|
#ifdef UNALIGNED_OK
|
|
movew IndBase(-MIN_MATCH,Scan_Ini),Scan_Start
|
|
movew IndBaseNdxw(-MIN_MATCH-1,Scan_Ini,Best_Len),Scan_End
|
|
#else
|
|
moveb IndBase(-MIN_MATCH,Scan_Ini),Scan_Start
|
|
lslw imm(8),Scan_Start
|
|
moveb IndBase(-MIN_MATCH+1,Scan_Ini),Scan_Start
|
|
moveb IndBaseNdxw(-MIN_MATCH-1,Scan_Ini,Best_Len),Scan_End
|
|
lslw imm(8),Scan_End
|
|
moveb IndBaseNdxw(-MIN_MATCH,Scan_Ini,Best_Len),Scan_End
|
|
#endif
|
|
bras L__do_scan
|
|
|
|
L__long_loop:
|
|
#ifdef UNALIGNED_OK
|
|
movew IndBaseNdxw(-MIN_MATCH-1,Scan_Ini,Best_Len),Scan_End
|
|
#else
|
|
moveb IndBaseNdxw(-MIN_MATCH-1,Scan_Ini,Best_Len),Scan_End
|
|
lslw imm(8),Scan_End
|
|
moveb IndBaseNdxw(-MIN_MATCH,Scan_Ini,Best_Len),Scan_End
|
|
#endif
|
|
|
|
L__short_loop:
|
|
lslw imm(1),Cur_Match
|
|
movew IndBaseNdxl(0,Prev_Address,Cur_Match),Cur_Match
|
|
cmpw invert_maybe(Limit,Cur_Match)
|
|
dbls Chain_Length,L__do_scan
|
|
bras L__return
|
|
|
|
L__do_scan:
|
|
movel Match_Ini,Match
|
|
addl Cur_Match,Match
|
|
#ifdef UNALIGNED_OK
|
|
cmpw invert_maybe(IndBaseNdxw(-MIN_MATCH-1,Match,Best_Len),Scan_End)
|
|
bne L__short_loop
|
|
cmpw invert_maybe(IndBase(-MIN_MATCH,Match),Scan_Start)
|
|
bne L__short_loop
|
|
#else
|
|
moveb IndBaseNdxw(-MIN_MATCH-1,Match,Best_Len),Scan_Test
|
|
lslw imm(8),Scan_Test
|
|
moveb IndBaseNdxw(-MIN_MATCH,Match,Best_Len),Scan_Test
|
|
cmpw invert_maybe(Scan_Test,Scan_End)
|
|
bne L__short_loop
|
|
moveb IndBase(-MIN_MATCH,Match),Scan_Test
|
|
lslw imm(8),Scan_Test
|
|
moveb IndBase(-MIN_MATCH+1,Match),Scan_Test
|
|
cmpw invert_maybe(Scan_Test,Scan_Start)
|
|
bne L__short_loop
|
|
#endif
|
|
|
|
movew imm((MAX_MATCH-MIN_MATCH+1)-1),Loop_Counter
|
|
movel Scan_Ini,Scan
|
|
L__scan_loop:
|
|
cmpmb postinc(Match),postinc(Scan)
|
|
dbne Loop_Counter,L__scan_loop
|
|
|
|
subl Scan_Ini,Scan
|
|
addql imm(MIN_MATCH-1),Scan
|
|
cmpl invert_maybe(Best_Len,Scan)
|
|
bls L__short_loop
|
|
movel Scan,Best_Len
|
|
movel Cur_Match,_match_start
|
|
cmpl invert_maybe(_nice_match,Best_Len)
|
|
blos L__long_loop
|
|
L__return:
|
|
moveml postinc(Stack_Pointer),imm(popreg)
|
|
rts
|
|
|
|
#else
|
|
error: this asm version is for 386 or 680x0 only
|
|
#endif /* mc68000 || mc68020 */
|
|
#endif /* i386 || _I386 */
|