554 lines
16 KiB
NASM
Executable File
554 lines
16 KiB
NASM
Executable File
;uInt longest_match_x64(
|
|
; deflate_state *s,
|
|
; IPos cur_match); /* current match */
|
|
|
|
; gvmat64.asm -- Asm portion of the optimized longest_match for 32 bits x86_64
|
|
; (AMD64 on Athlon 64, Opteron, Phenom
|
|
; and Intel EM64T on Pentium 4 with EM64T, Pentium D, Core 2 Duo, Core I5/I7)
|
|
; Copyright (C) 1995-2010 Jean-loup Gailly, Brian Raiter and Gilles Vollant.
|
|
;
|
|
; File written by Gilles Vollant, by converting to assembly the longest_match
|
|
; from Jean-loup Gailly in deflate.c of zLib and infoZip zip.
|
|
;
|
|
; and by taking inspiration on asm686 with masm, optimised assembly code
|
|
; from Brian Raiter, written 1998
|
|
;
|
|
; This software is provided 'as-is', without any express or implied
|
|
; warranty. In no event will the authors be held liable for any damages
|
|
; arising from the use of this software.
|
|
;
|
|
; Permission is granted to anyone to use this software for any purpose,
|
|
; including commercial applications, and to alter it and redistribute it
|
|
; freely, subject to the following restrictions:
|
|
;
|
|
; 1. The origin of this software must not be misrepresented; you must not
|
|
; claim that you wrote the original software. If you use this software
|
|
; in a product, an acknowledgment in the product documentation would be
|
|
; appreciated but is not required.
|
|
; 2. Altered source versions must be plainly marked as such, and must not be
|
|
; misrepresented as being the original software
|
|
; 3. This notice may not be removed or altered from any source distribution.
|
|
;
|
|
;
|
|
;
|
|
; http://www.zlib.net
|
|
; http://www.winimage.com/zLibDll
|
|
; http://www.muppetlabs.com/~breadbox/software/assembly.html
|
|
;
|
|
; to compile this file for infozip Zip, I use option:
|
|
; ml64.exe /Flgvmat64 /c /Zi /DINFOZIP gvmat64.asm
|
|
;
|
|
; to compile this file for zLib, I use option:
|
|
; ml64.exe /Flgvmat64 /c /Zi gvmat64.asm
|
|
; Be carrefull to adapt zlib1222add below to your version of zLib
|
|
; (if you use a version of zLib before 1.0.4 or after 1.2.2.2, change
|
|
; value of zlib1222add later)
|
|
;
|
|
; This file compile with Microsoft Macro Assembler (x64) for AMD64
|
|
;
|
|
; ml64.exe is given with Visual Studio 2005/2008/2010 and Windows WDK
|
|
;
|
|
; (you can get Windows WDK with ml64 for AMD64 from
|
|
; http://www.microsoft.com/whdc/Devtools/wdk/default.mspx for low price)
|
|
;
|
|
|
|
|
|
;uInt longest_match(s, cur_match)
|
|
; deflate_state *s;
|
|
; IPos cur_match; /* current match */
|
|
.code
|
|
longest_match PROC
|
|
|
|
|
|
;LocalVarsSize equ 88
|
|
LocalVarsSize equ 72
|
|
|
|
; register used : rax,rbx,rcx,rdx,rsi,rdi,r8,r9,r10,r11,r12
|
|
; free register : r14,r15
|
|
; register can be saved : rsp
|
|
|
|
chainlenwmask equ rsp + 8 - LocalVarsSize ; high word: current chain len
|
|
; low word: s->wmask
|
|
;window equ rsp + xx - LocalVarsSize ; local copy of s->window ; stored in r10
|
|
;windowbestlen equ rsp + xx - LocalVarsSize ; s->window + bestlen , use r10+r11
|
|
;scanstart equ rsp + xx - LocalVarsSize ; first two bytes of string ; stored in r12w
|
|
;scanend equ rsp + xx - LocalVarsSize ; last two bytes of string use ebx
|
|
;scanalign equ rsp + xx - LocalVarsSize ; dword-misalignment of string r13
|
|
;bestlen equ rsp + xx - LocalVarsSize ; size of best match so far -> r11d
|
|
;scan equ rsp + xx - LocalVarsSize ; ptr to string wanting match -> r9
|
|
IFDEF INFOZIP
|
|
ELSE
|
|
nicematch equ (rsp + 16 - LocalVarsSize) ; a good enough match size
|
|
ENDIF
|
|
|
|
save_rdi equ rsp + 24 - LocalVarsSize
|
|
save_rsi equ rsp + 32 - LocalVarsSize
|
|
save_rbx equ rsp + 40 - LocalVarsSize
|
|
save_rbp equ rsp + 48 - LocalVarsSize
|
|
save_r12 equ rsp + 56 - LocalVarsSize
|
|
save_r13 equ rsp + 64 - LocalVarsSize
|
|
;save_r14 equ rsp + 72 - LocalVarsSize
|
|
;save_r15 equ rsp + 80 - LocalVarsSize
|
|
|
|
|
|
; summary of register usage
|
|
; scanend ebx
|
|
; scanendw bx
|
|
; chainlenwmask edx
|
|
; curmatch rsi
|
|
; curmatchd esi
|
|
; windowbestlen r8
|
|
; scanalign r9
|
|
; scanalignd r9d
|
|
; window r10
|
|
; bestlen r11
|
|
; bestlend r11d
|
|
; scanstart r12d
|
|
; scanstartw r12w
|
|
; scan r13
|
|
; nicematch r14d
|
|
; limit r15
|
|
; limitd r15d
|
|
; prev rcx
|
|
|
|
; all the +4 offsets are due to the addition of pending_buf_size (in zlib
|
|
; in the deflate_state structure since the asm code was first written
|
|
; (if you compile with zlib 1.0.4 or older, remove the +4).
|
|
; Note : these value are good with a 8 bytes boundary pack structure
|
|
|
|
|
|
MAX_MATCH equ 258
|
|
MIN_MATCH equ 3
|
|
MIN_LOOKAHEAD equ (MAX_MATCH+MIN_MATCH+1)
|
|
|
|
|
|
;;; Offsets for fields in the deflate_state structure. These numbers
|
|
;;; are calculated from the definition of deflate_state, with the
|
|
;;; assumption that the compiler will dword-align the fields. (Thus,
|
|
;;; changing the definition of deflate_state could easily cause this
|
|
;;; program to crash horribly, without so much as a warning at
|
|
;;; compile time. Sigh.)
|
|
|
|
; all the +zlib1222add offsets are due to the addition of fields
|
|
; in zlib in the deflate_state structure since the asm code was first written
|
|
; (if you compile with zlib 1.0.4 or older, use "zlib1222add equ (-4)").
|
|
; (if you compile with zlib between 1.0.5 and 1.2.2.1, use "zlib1222add equ 0").
|
|
; if you compile with zlib 1.2.2.2 or later , use "zlib1222add equ 8").
|
|
|
|
|
|
IFDEF INFOZIP
|
|
|
|
_DATA SEGMENT
|
|
COMM window_size:DWORD
|
|
; WMask ; 7fff
|
|
COMM window:BYTE:010040H
|
|
COMM prev:WORD:08000H
|
|
; MatchLen : unused
|
|
; PrevMatch : unused
|
|
COMM strstart:DWORD
|
|
COMM match_start:DWORD
|
|
; Lookahead : ignore
|
|
COMM prev_length:DWORD ; PrevLen
|
|
COMM max_chain_length:DWORD
|
|
COMM good_match:DWORD
|
|
COMM nice_match:DWORD
|
|
prev_ad equ OFFSET prev
|
|
window_ad equ OFFSET window
|
|
nicematch equ nice_match
|
|
_DATA ENDS
|
|
WMask equ 07fffh
|
|
|
|
ELSE
|
|
|
|
IFNDEF zlib1222add
|
|
zlib1222add equ 8
|
|
ENDIF
|
|
dsWSize equ 56+zlib1222add+(zlib1222add/2)
|
|
dsWMask equ 64+zlib1222add+(zlib1222add/2)
|
|
dsWindow equ 72+zlib1222add
|
|
dsPrev equ 88+zlib1222add
|
|
dsMatchLen equ 128+zlib1222add
|
|
dsPrevMatch equ 132+zlib1222add
|
|
dsStrStart equ 140+zlib1222add
|
|
dsMatchStart equ 144+zlib1222add
|
|
dsLookahead equ 148+zlib1222add
|
|
dsPrevLen equ 152+zlib1222add
|
|
dsMaxChainLen equ 156+zlib1222add
|
|
dsGoodMatch equ 172+zlib1222add
|
|
dsNiceMatch equ 176+zlib1222add
|
|
|
|
window_size equ [ rcx + dsWSize]
|
|
WMask equ [ rcx + dsWMask]
|
|
window_ad equ [ rcx + dsWindow]
|
|
prev_ad equ [ rcx + dsPrev]
|
|
strstart equ [ rcx + dsStrStart]
|
|
match_start equ [ rcx + dsMatchStart]
|
|
Lookahead equ [ rcx + dsLookahead] ; 0ffffffffh on infozip
|
|
prev_length equ [ rcx + dsPrevLen]
|
|
max_chain_length equ [ rcx + dsMaxChainLen]
|
|
good_match equ [ rcx + dsGoodMatch]
|
|
nice_match equ [ rcx + dsNiceMatch]
|
|
ENDIF
|
|
|
|
; parameter 1 in r8(deflate state s), param 2 in rdx (cur match)
|
|
|
|
; see http://weblogs.asp.net/oldnewthing/archive/2004/01/14/58579.aspx and
|
|
; http://msdn.microsoft.com/library/en-us/kmarch/hh/kmarch/64bitAMD_8e951dd2-ee77-4728-8702-55ce4b5dd24a.xml.asp
|
|
;
|
|
; All registers must be preserved across the call, except for
|
|
; rax, rcx, rdx, r8, r9, r10, and r11, which are scratch.
|
|
|
|
|
|
|
|
;;; Save registers that the compiler may be using, and adjust esp to
|
|
;;; make room for our stack frame.
|
|
|
|
|
|
;;; Retrieve the function arguments. r8d will hold cur_match
|
|
;;; throughout the entire function. edx will hold the pointer to the
|
|
;;; deflate_state structure during the function's setup (before
|
|
;;; entering the main loop.
|
|
|
|
; parameter 1 in rcx (deflate_state* s), param 2 in edx -> r8 (cur match)
|
|
|
|
; this clear high 32 bits of r8, which can be garbage in both r8 and rdx
|
|
|
|
mov [save_rdi],rdi
|
|
mov [save_rsi],rsi
|
|
mov [save_rbx],rbx
|
|
mov [save_rbp],rbp
|
|
IFDEF INFOZIP
|
|
mov r8d,ecx
|
|
ELSE
|
|
mov r8d,edx
|
|
ENDIF
|
|
mov [save_r12],r12
|
|
mov [save_r13],r13
|
|
; mov [save_r14],r14
|
|
; mov [save_r15],r15
|
|
|
|
|
|
;;; uInt wmask = s->w_mask;
|
|
;;; unsigned chain_length = s->max_chain_length;
|
|
;;; if (s->prev_length >= s->good_match) {
|
|
;;; chain_length >>= 2;
|
|
;;; }
|
|
|
|
mov edi, prev_length
|
|
mov esi, good_match
|
|
mov eax, WMask
|
|
mov ebx, max_chain_length
|
|
cmp edi, esi
|
|
jl LastMatchGood
|
|
shr ebx, 2
|
|
LastMatchGood:
|
|
|
|
;;; chainlen is decremented once beforehand so that the function can
|
|
;;; use the sign flag instead of the zero flag for the exit test.
|
|
;;; It is then shifted into the high word, to make room for the wmask
|
|
;;; value, which it will always accompany.
|
|
|
|
dec ebx
|
|
shl ebx, 16
|
|
or ebx, eax
|
|
|
|
;;; on zlib only
|
|
;;; if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;
|
|
|
|
IFDEF INFOZIP
|
|
mov [chainlenwmask], ebx
|
|
; on infozip nice_match = [nice_match]
|
|
ELSE
|
|
mov eax, nice_match
|
|
mov [chainlenwmask], ebx
|
|
mov r10d, Lookahead
|
|
cmp r10d, eax
|
|
cmovnl r10d, eax
|
|
mov [nicematch],r10d
|
|
ENDIF
|
|
|
|
;;; register Bytef *scan = s->window + s->strstart;
|
|
mov r10, window_ad
|
|
mov ebp, strstart
|
|
lea r13, [r10 + rbp]
|
|
|
|
;;; Determine how many bytes the scan ptr is off from being
|
|
;;; dword-aligned.
|
|
|
|
mov r9,r13
|
|
neg r13
|
|
and r13,3
|
|
|
|
;;; IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
|
|
;;; s->strstart - (IPos)MAX_DIST(s) : NIL;
|
|
IFDEF INFOZIP
|
|
mov eax,07efah ; MAX_DIST = (WSIZE-MIN_LOOKAHEAD) (0x8000-(3+8+1))
|
|
ELSE
|
|
mov eax, window_size
|
|
sub eax, MIN_LOOKAHEAD
|
|
ENDIF
|
|
xor edi,edi
|
|
sub ebp, eax
|
|
|
|
mov r11d, prev_length
|
|
|
|
cmovng ebp,edi
|
|
|
|
;;; int best_len = s->prev_length;
|
|
|
|
|
|
;;; Store the sum of s->window + best_len in esi locally, and in esi.
|
|
|
|
lea rsi,[r10+r11]
|
|
|
|
;;; register ush scan_start = *(ushf*)scan;
|
|
;;; register ush scan_end = *(ushf*)(scan+best_len-1);
|
|
;;; Posf *prev = s->prev;
|
|
|
|
movzx r12d,word ptr [r9]
|
|
movzx ebx, word ptr [r9 + r11 - 1]
|
|
|
|
mov rdi, prev_ad
|
|
|
|
;;; Jump into the main loop.
|
|
|
|
mov edx, [chainlenwmask]
|
|
|
|
cmp bx,word ptr [rsi + r8 - 1]
|
|
jz LookupLoopIsZero
|
|
|
|
LookupLoop1:
|
|
and r8d, edx
|
|
|
|
movzx r8d, word ptr [rdi + r8*2]
|
|
cmp r8d, ebp
|
|
jbe LeaveNow
|
|
sub edx, 00010000h
|
|
js LeaveNow
|
|
|
|
LoopEntry1:
|
|
cmp bx,word ptr [rsi + r8 - 1]
|
|
jz LookupLoopIsZero
|
|
|
|
LookupLoop2:
|
|
and r8d, edx
|
|
|
|
movzx r8d, word ptr [rdi + r8*2]
|
|
cmp r8d, ebp
|
|
jbe LeaveNow
|
|
sub edx, 00010000h
|
|
js LeaveNow
|
|
|
|
LoopEntry2:
|
|
cmp bx,word ptr [rsi + r8 - 1]
|
|
jz LookupLoopIsZero
|
|
|
|
LookupLoop4:
|
|
and r8d, edx
|
|
|
|
movzx r8d, word ptr [rdi + r8*2]
|
|
cmp r8d, ebp
|
|
jbe LeaveNow
|
|
sub edx, 00010000h
|
|
js LeaveNow
|
|
|
|
LoopEntry4:
|
|
|
|
cmp bx,word ptr [rsi + r8 - 1]
|
|
jnz LookupLoop1
|
|
jmp LookupLoopIsZero
|
|
|
|
|
|
;;; do {
|
|
;;; match = s->window + cur_match;
|
|
;;; if (*(ushf*)(match+best_len-1) != scan_end ||
|
|
;;; *(ushf*)match != scan_start) continue;
|
|
;;; [...]
|
|
;;; } while ((cur_match = prev[cur_match & wmask]) > limit
|
|
;;; && --chain_length != 0);
|
|
;;;
|
|
;;; Here is the inner loop of the function. The function will spend the
|
|
;;; majority of its time in this loop, and majority of that time will
|
|
;;; be spent in the first ten instructions.
|
|
;;;
|
|
;;; Within this loop:
|
|
;;; ebx = scanend
|
|
;;; r8d = curmatch
|
|
;;; edx = chainlenwmask - i.e., ((chainlen << 16) | wmask)
|
|
;;; esi = windowbestlen - i.e., (window + bestlen)
|
|
;;; edi = prev
|
|
;;; ebp = limit
|
|
|
|
LookupLoop:
|
|
and r8d, edx
|
|
|
|
movzx r8d, word ptr [rdi + r8*2]
|
|
cmp r8d, ebp
|
|
jbe LeaveNow
|
|
sub edx, 00010000h
|
|
js LeaveNow
|
|
|
|
LoopEntry:
|
|
|
|
cmp bx,word ptr [rsi + r8 - 1]
|
|
jnz LookupLoop1
|
|
LookupLoopIsZero:
|
|
cmp r12w, word ptr [r10 + r8]
|
|
jnz LookupLoop1
|
|
|
|
|
|
;;; Store the current value of chainlen.
|
|
mov [chainlenwmask], edx
|
|
|
|
;;; Point edi to the string under scrutiny, and esi to the string we
|
|
;;; are hoping to match it up with. In actuality, esi and edi are
|
|
;;; both pointed (MAX_MATCH_8 - scanalign) bytes ahead, and edx is
|
|
;;; initialized to -(MAX_MATCH_8 - scanalign).
|
|
|
|
lea rsi,[r8+r10]
|
|
mov rdx, 0fffffffffffffef8h; -(MAX_MATCH_8)
|
|
lea rsi, [rsi + r13 + 0108h] ;MAX_MATCH_8]
|
|
lea rdi, [r9 + r13 + 0108h] ;MAX_MATCH_8]
|
|
|
|
prefetcht1 [rsi+rdx]
|
|
prefetcht1 [rdi+rdx]
|
|
|
|
|
|
;;; Test the strings for equality, 8 bytes at a time. At the end,
|
|
;;; adjust rdx so that it is offset to the exact byte that mismatched.
|
|
;;;
|
|
;;; We already know at this point that the first three bytes of the
|
|
;;; strings match each other, and they can be safely passed over before
|
|
;;; starting the compare loop. So what this code does is skip over 0-3
|
|
;;; bytes, as much as necessary in order to dword-align the edi
|
|
;;; pointer. (rsi will still be misaligned three times out of four.)
|
|
;;;
|
|
;;; It should be confessed that this loop usually does not represent
|
|
;;; much of the total running time. Replacing it with a more
|
|
;;; straightforward "rep cmpsb" would not drastically degrade
|
|
;;; performance.
|
|
|
|
|
|
LoopCmps:
|
|
mov rax, [rsi + rdx]
|
|
xor rax, [rdi + rdx]
|
|
jnz LeaveLoopCmps
|
|
|
|
mov rax, [rsi + rdx + 8]
|
|
xor rax, [rdi + rdx + 8]
|
|
jnz LeaveLoopCmps8
|
|
|
|
|
|
mov rax, [rsi + rdx + 8+8]
|
|
xor rax, [rdi + rdx + 8+8]
|
|
jnz LeaveLoopCmps16
|
|
|
|
add rdx,8+8+8
|
|
|
|
jnz short LoopCmps
|
|
jmp short LenMaximum
|
|
LeaveLoopCmps16: add rdx,8
|
|
LeaveLoopCmps8: add rdx,8
|
|
LeaveLoopCmps:
|
|
|
|
test eax, 0000FFFFh
|
|
jnz LenLower
|
|
|
|
test eax,0ffffffffh
|
|
|
|
jnz LenLower32
|
|
|
|
add rdx,4
|
|
shr rax,32
|
|
or ax,ax
|
|
jnz LenLower
|
|
|
|
LenLower32:
|
|
shr eax,16
|
|
add rdx,2
|
|
LenLower: sub al, 1
|
|
adc rdx, 0
|
|
;;; Calculate the length of the match. If it is longer than MAX_MATCH,
|
|
;;; then automatically accept it as the best possible match and leave.
|
|
|
|
lea rax, [rdi + rdx]
|
|
sub rax, r9
|
|
cmp eax, MAX_MATCH
|
|
jge LenMaximum
|
|
|
|
;;; If the length of the match is not longer than the best match we
|
|
;;; have so far, then forget it and return to the lookup loop.
|
|
;///////////////////////////////////
|
|
|
|
cmp eax, r11d
|
|
jg LongerMatch
|
|
|
|
lea rsi,[r10+r11]
|
|
|
|
mov rdi, prev_ad
|
|
mov edx, [chainlenwmask]
|
|
jmp LookupLoop
|
|
|
|
;;; s->match_start = cur_match;
|
|
;;; best_len = len;
|
|
;;; if (len >= nice_match) break;
|
|
;;; scan_end = *(ushf*)(scan+best_len-1);
|
|
|
|
LongerMatch:
|
|
mov r11d, eax
|
|
mov match_start, r8d
|
|
cmp eax, [nicematch]
|
|
jge LeaveNow
|
|
|
|
lea rsi,[r10+rax]
|
|
|
|
movzx ebx, word ptr [r9 + rax - 1]
|
|
mov rdi, prev_ad
|
|
mov edx, [chainlenwmask]
|
|
jmp LookupLoop
|
|
|
|
;;; Accept the current string, with the maximum possible length.
|
|
|
|
LenMaximum:
|
|
mov r11d,MAX_MATCH
|
|
mov match_start, r8d
|
|
|
|
;;; if ((uInt)best_len <= s->lookahead) return (uInt)best_len;
|
|
;;; return s->lookahead;
|
|
|
|
LeaveNow:
|
|
IFDEF INFOZIP
|
|
mov eax,r11d
|
|
ELSE
|
|
mov eax, Lookahead
|
|
cmp r11d, eax
|
|
cmovng eax, r11d
|
|
ENDIF
|
|
|
|
;;; Restore the stack and return from whence we came.
|
|
|
|
|
|
mov rsi,[save_rsi]
|
|
mov rdi,[save_rdi]
|
|
mov rbx,[save_rbx]
|
|
mov rbp,[save_rbp]
|
|
mov r12,[save_r12]
|
|
mov r13,[save_r13]
|
|
; mov r14,[save_r14]
|
|
; mov r15,[save_r15]
|
|
|
|
|
|
ret 0
|
|
; please don't remove this string !
|
|
; Your can freely use gvmat64 in any free or commercial app
|
|
; but it is far better don't remove the string in the binary!
|
|
db 0dh,0ah,"asm686 with masm, optimised assembly code from Brian Raiter, written 1998, converted to amd 64 by Gilles Vollant 2005",0dh,0ah,0
|
|
longest_match ENDP
|
|
|
|
match_init PROC
|
|
ret 0
|
|
match_init ENDP
|
|
|
|
|
|
END
|