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git-svn-id: svn://tug.org/texlive/trunk@1483 c570f23f-e606-0410-a88d-b1316a301751

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diff --git a/Build/source/libs/zlib/contrib/masmx86/gvmat32.asm b/Build/source/libs/zlib/contrib/masmx86/gvmat32.asm
new file mode 100644
index 00000000000..bb4f854e408
--- /dev/null
+++ b/Build/source/libs/zlib/contrib/masmx86/gvmat32.asm
@@ -0,0 +1,972 @@
+; gvmat32.asm -- Asm portion of the optimized longest_match for 32 bits x86
+; Copyright (C) 1995-1996 Jean-loup Gailly and Gilles Vollant.
+; File written by Gilles Vollant, by modifiying the longest_match
+;  from Jean-loup Gailly in deflate.c
+;
+;         http://www.zlib.net
+;         http://www.winimage.com/zLibDll
+;         http://www.muppetlabs.com/~breadbox/software/assembly.html
+;
+; For Visual C++ 4.x and higher and ML 6.x and higher
+;   ml.exe is in directory \MASM611C of Win95 DDK
+;   ml.exe is also distributed in http://www.masm32.com/masmdl.htm
+;    and in VC++2003 toolkit at http://msdn.microsoft.com/visualc/vctoolkit2003/
+;
+; this file contain two implementation of longest_match
+;
+;  longest_match_7fff : written 1996 by Gilles Vollant optimized for 
+;            first Pentium. Assume s->w_mask == 0x7fff
+;  longest_match_686 : written by Brian raiter (1998), optimized for Pentium Pro
+;
+;  for using an seembly version of longest_match, you need define ASMV in project
+;  There is two way in using gvmat32.asm
+;
+;  A) Suggested method
+;    if you want include both longest_match_7fff and longest_match_686
+;    compile the asm file running
+;           ml /coff /Zi /Flgvmat32.lst /c gvmat32.asm
+;    and include gvmat32c.c in your project
+;    if you have an old cpu (386,486 or first Pentium) and s->w_mask==0x7fff,
+;        longest_match_7fff will be used
+;    if you have a more modern CPU (Pentium Pro, II and higher)
+;        longest_match_686 will be used
+;    on old cpu with s->w_mask!=0x7fff, longest_match_686 will be used,
+;        but this is not a sitation you'll find often
+;
+;  B) Alternative
+;    if you are not interresed in old cpu performance and want the smaller
+;       binaries possible
+;
+;    compile the asm file running
+;           ml /coff /Zi /c /Flgvmat32.lst /DNOOLDPENTIUMCODE gvmat32.asm
+;    and do not include gvmat32c.c in your project (ou define also 
+;              NOOLDPENTIUMCODE)
+;
+; note : as I known, longest_match_686 is very faster than longest_match_7fff
+;        on pentium Pro/II/III, faster (but less) in P4, but it seem
+;        longest_match_7fff can be faster (very very litte) on AMD Athlon64/K8
+;
+; see below : zlib1222add must be adjuster if you use a zlib version < 1.2.2.2
+
+;uInt longest_match_7fff(s, cur_match)
+;    deflate_state *s;
+;    IPos cur_match;                             /* current match */
+
+    NbStack         equ     76
+    cur_match       equ     dword ptr[esp+NbStack-0]
+    str_s           equ     dword ptr[esp+NbStack-4]
+; 5 dword on top (ret,ebp,esi,edi,ebx)
+    adrret          equ     dword ptr[esp+NbStack-8]
+    pushebp         equ     dword ptr[esp+NbStack-12]
+    pushedi         equ     dword ptr[esp+NbStack-16]
+    pushesi         equ     dword ptr[esp+NbStack-20]
+    pushebx         equ     dword ptr[esp+NbStack-24]
+
+    chain_length    equ     dword ptr [esp+NbStack-28]
+    limit           equ     dword ptr [esp+NbStack-32]
+    best_len        equ     dword ptr [esp+NbStack-36]
+    window          equ     dword ptr [esp+NbStack-40]
+    prev            equ     dword ptr [esp+NbStack-44]
+    scan_start      equ      word ptr [esp+NbStack-48]
+    wmask           equ     dword ptr [esp+NbStack-52]
+    match_start_ptr equ     dword ptr [esp+NbStack-56]
+    nice_match      equ     dword ptr [esp+NbStack-60]
+    scan            equ     dword ptr [esp+NbStack-64]
+
+    windowlen       equ     dword ptr [esp+NbStack-68]
+    match_start     equ     dword ptr [esp+NbStack-72]
+    strend          equ     dword ptr [esp+NbStack-76]
+    NbStackAdd      equ     (NbStack-24)
+
+    .386p
+
+    name    gvmatch
+    .MODEL  FLAT
+
+
+
+;  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").
+
+    zlib1222add         equ     8
+
+;  Note : these value are good with a 8 bytes boundary pack structure
+    dep_chain_length    equ     74h+zlib1222add
+    dep_window          equ     30h+zlib1222add
+    dep_strstart        equ     64h+zlib1222add
+    dep_prev_length     equ     70h+zlib1222add
+    dep_nice_match      equ     88h+zlib1222add
+    dep_w_size          equ     24h+zlib1222add
+    dep_prev            equ     38h+zlib1222add
+    dep_w_mask          equ     2ch+zlib1222add
+    dep_good_match      equ     84h+zlib1222add
+    dep_match_start     equ     68h+zlib1222add
+    dep_lookahead       equ     6ch+zlib1222add
+
+
+_TEXT                   segment
+
+IFDEF NOUNDERLINE
+   IFDEF NOOLDPENTIUMCODE
+            public  longest_match
+            public  match_init
+   ELSE            
+            public  longest_match_7fff
+            public  cpudetect32
+            public  longest_match_686
+   ENDIF
+ELSE
+   IFDEF NOOLDPENTIUMCODE
+            public  _longest_match
+            public  _match_init
+   ELSE
+            public  _longest_match_7fff
+            public  _cpudetect32
+            public  _longest_match_686
+   ENDIF
+ENDIF
+
+    MAX_MATCH           equ     258
+    MIN_MATCH           equ     3
+    MIN_LOOKAHEAD       equ     (MAX_MATCH+MIN_MATCH+1)
+
+
+
+IFNDEF NOOLDPENTIUMCODE
+IFDEF NOUNDERLINE
+longest_match_7fff   proc near
+ELSE
+_longest_match_7fff  proc near
+ENDIF
+
+    mov     edx,[esp+4]
+
+
+
+    push    ebp
+    push    edi
+    push    esi
+    push    ebx
+
+    sub     esp,NbStackAdd
+
+; initialize or check the variables used in match.asm.
+    mov     ebp,edx
+
+; chain_length = s->max_chain_length
+; if (prev_length>=good_match) chain_length >>= 2
+    mov     edx,[ebp+dep_chain_length]
+    mov     ebx,[ebp+dep_prev_length]
+    cmp     [ebp+dep_good_match],ebx
+    ja      noshr
+    shr     edx,2
+noshr:
+; we increment chain_length because in the asm, the --chain_lenght is in the beginning of the loop
+    inc     edx
+    mov     edi,[ebp+dep_nice_match]
+    mov     chain_length,edx
+    mov     eax,[ebp+dep_lookahead]
+    cmp     eax,edi
+; if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;
+    jae     nolookaheadnicematch
+    mov     edi,eax
+nolookaheadnicematch:
+; best_len = s->prev_length
+    mov     best_len,ebx
+
+; window = s->window
+    mov     esi,[ebp+dep_window]
+    mov     ecx,[ebp+dep_strstart]
+    mov     window,esi
+
+    mov     nice_match,edi
+; scan = window + strstart
+    add     esi,ecx
+    mov     scan,esi
+; dx = *window
+    mov     dx,word ptr [esi]
+; bx = *(window+best_len-1)
+    mov     bx,word ptr [esi+ebx-1]
+    add     esi,MAX_MATCH-1
+; scan_start = *scan
+    mov     scan_start,dx
+; strend = scan + MAX_MATCH-1
+    mov     strend,esi
+; bx = scan_end = *(window+best_len-1)
+
+;    IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
+;        s->strstart - (IPos)MAX_DIST(s) : NIL;
+
+    mov     esi,[ebp+dep_w_size]
+    sub     esi,MIN_LOOKAHEAD
+; here esi = MAX_DIST(s)
+    sub     ecx,esi
+    ja      nodist
+    xor     ecx,ecx
+nodist:
+    mov     limit,ecx
+
+; prev = s->prev
+    mov     edx,[ebp+dep_prev]
+    mov     prev,edx
+
+;
+    mov     edx,dword ptr [ebp+dep_match_start]
+    mov     bp,scan_start
+    mov     eax,cur_match
+    mov     match_start,edx
+
+    mov     edx,window
+    mov     edi,edx
+    add     edi,best_len
+    mov     esi,prev
+    dec     edi
+; windowlen = window + best_len -1
+    mov     windowlen,edi
+
+    jmp     beginloop2
+    align   4
+
+; here, in the loop
+;       eax = ax = cur_match
+;       ecx = limit
+;        bx = scan_end
+;        bp = scan_start
+;       edi = windowlen (window + best_len -1)
+;       esi = prev
+
+
+;// here; chain_length <=16
+normalbeg0add16:
+    add     chain_length,16
+    jz      exitloop
+normalbeg0:
+    cmp     word ptr[edi+eax],bx
+    je      normalbeg2noroll
+rcontlabnoroll:
+; cur_match = prev[cur_match & wmask]
+    and     eax,7fffh
+    mov     ax,word ptr[esi+eax*2]
+; if cur_match > limit, go to exitloop
+    cmp     ecx,eax
+    jnb     exitloop
+; if --chain_length != 0, go to exitloop
+    dec     chain_length
+    jnz     normalbeg0
+    jmp     exitloop
+
+normalbeg2noroll:
+; if (scan_start==*(cur_match+window)) goto normalbeg2
+    cmp     bp,word ptr[edx+eax]
+    jne     rcontlabnoroll
+    jmp     normalbeg2
+
+contloop3:
+    mov     edi,windowlen
+
+; cur_match = prev[cur_match & wmask]
+    and     eax,7fffh
+    mov     ax,word ptr[esi+eax*2]
+; if cur_match > limit, go to exitloop
+    cmp     ecx,eax
+jnbexitloopshort1:
+    jnb     exitloop
+; if --chain_length != 0, go to exitloop
+
+
+; begin the main loop
+beginloop2:
+    sub     chain_length,16+1
+; if chain_length <=16, don't use the unrolled loop
+    jna     normalbeg0add16
+
+do16:
+    cmp     word ptr[edi+eax],bx
+    je      normalbeg2dc0
+
+maccn   MACRO   lab
+    and     eax,7fffh
+    mov     ax,word ptr[esi+eax*2]
+    cmp     ecx,eax
+    jnb     exitloop
+    cmp     word ptr[edi+eax],bx
+    je      lab
+    ENDM
+
+rcontloop0:
+    maccn   normalbeg2dc1
+
+rcontloop1:
+    maccn   normalbeg2dc2
+
+rcontloop2:
+    maccn   normalbeg2dc3
+
+rcontloop3:
+    maccn   normalbeg2dc4
+
+rcontloop4:
+    maccn   normalbeg2dc5
+
+rcontloop5:
+    maccn   normalbeg2dc6
+
+rcontloop6:
+    maccn   normalbeg2dc7
+
+rcontloop7:
+    maccn   normalbeg2dc8
+
+rcontloop8:
+    maccn   normalbeg2dc9
+
+rcontloop9:
+    maccn   normalbeg2dc10
+
+rcontloop10:
+    maccn   short normalbeg2dc11
+
+rcontloop11:
+    maccn   short normalbeg2dc12
+
+rcontloop12:
+    maccn   short normalbeg2dc13
+
+rcontloop13:
+    maccn   short normalbeg2dc14
+
+rcontloop14:
+    maccn   short normalbeg2dc15
+
+rcontloop15:
+    and     eax,7fffh
+    mov     ax,word ptr[esi+eax*2]
+    cmp     ecx,eax
+    jnb     exitloop
+
+    sub     chain_length,16
+    ja      do16
+    jmp     normalbeg0add16
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+normbeg MACRO   rcontlab,valsub
+; if we are here, we know that *(match+best_len-1) == scan_end
+    cmp     bp,word ptr[edx+eax]
+; if (match != scan_start) goto rcontlab
+    jne     rcontlab
+; calculate the good chain_length, and we'll compare scan and match string
+    add     chain_length,16-valsub
+    jmp     iseq
+    ENDM
+
+
+normalbeg2dc11:
+    normbeg rcontloop11,11
+
+normalbeg2dc12:
+    normbeg short rcontloop12,12
+
+normalbeg2dc13:
+    normbeg short rcontloop13,13
+
+normalbeg2dc14:
+    normbeg short rcontloop14,14
+
+normalbeg2dc15:
+    normbeg short rcontloop15,15
+
+normalbeg2dc10:
+    normbeg rcontloop10,10
+
+normalbeg2dc9:
+    normbeg rcontloop9,9
+
+normalbeg2dc8:
+    normbeg rcontloop8,8
+
+normalbeg2dc7:
+    normbeg rcontloop7,7
+
+normalbeg2dc6:
+    normbeg rcontloop6,6
+
+normalbeg2dc5:
+    normbeg rcontloop5,5
+
+normalbeg2dc4:
+    normbeg rcontloop4,4
+
+normalbeg2dc3:
+    normbeg rcontloop3,3
+
+normalbeg2dc2:
+    normbeg rcontloop2,2
+
+normalbeg2dc1:
+    normbeg rcontloop1,1
+
+normalbeg2dc0:
+    normbeg rcontloop0,0
+
+
+; we go in normalbeg2 because *(ushf*)(match+best_len-1) == scan_end
+
+normalbeg2:
+    mov     edi,window
+
+    cmp     bp,word ptr[edi+eax]
+    jne     contloop3                   ; if *(ushf*)match != scan_start, continue
+
+iseq:
+; if we are here, we know that *(match+best_len-1) == scan_end
+; and (match == scan_start)
+
+    mov     edi,edx
+    mov     esi,scan                    ; esi = scan
+    add     edi,eax                     ; edi = window + cur_match = match
+
+    mov     edx,[esi+3]                 ; compare manually dword at match+3
+    xor     edx,[edi+3]                 ; and scan +3
+
+    jz      begincompare                ; if equal, go to long compare
+
+; we will determine the unmatch byte and calculate len (in esi)
+    or      dl,dl
+    je      eq1rr
+    mov     esi,3
+    jmp     trfinval
+eq1rr:
+    or      dx,dx
+    je      eq1
+
+    mov     esi,4
+    jmp     trfinval
+eq1:
+    and     edx,0ffffffh
+    jz      eq11
+    mov     esi,5
+    jmp     trfinval
+eq11:
+    mov     esi,6
+    jmp     trfinval
+
+begincompare:
+    ; here we now scan and match begin same
+    add     edi,6
+    add     esi,6
+    mov     ecx,(MAX_MATCH-(2+4))/4     ; scan for at most MAX_MATCH bytes
+    repe    cmpsd                       ; loop until mismatch
+
+    je      trfin                       ; go to trfin if not unmatch
+; we determine the unmatch byte
+    sub     esi,4
+    mov     edx,[edi-4]
+    xor     edx,[esi]
+
+    or      dl,dl
+    jnz     trfin
+    inc     esi
+
+    or      dx,dx
+    jnz     trfin
+    inc     esi
+
+    and     edx,0ffffffh
+    jnz     trfin
+    inc     esi
+
+trfin:
+    sub     esi,scan          ; esi = len
+trfinval:
+; here we have finised compare, and esi contain len of equal string
+    cmp     esi,best_len        ; if len > best_len, go newbestlen
+    ja      short newbestlen
+; now we restore edx, ecx and esi, for the big loop
+    mov     esi,prev
+    mov     ecx,limit
+    mov     edx,window
+    jmp     contloop3
+
+newbestlen:
+    mov     best_len,esi        ; len become best_len
+
+    mov     match_start,eax     ; save new position as match_start
+    cmp     esi,nice_match      ; if best_len >= nice_match, exit
+    jae     exitloop
+    mov     ecx,scan
+    mov     edx,window          ; restore edx=window
+    add     ecx,esi
+    add     esi,edx
+
+    dec     esi
+    mov     windowlen,esi       ; windowlen = window + best_len-1
+    mov     bx,[ecx-1]          ; bx = *(scan+best_len-1) = scan_end
+
+; now we restore ecx and esi, for the big loop :
+    mov     esi,prev
+    mov     ecx,limit
+    jmp     contloop3
+
+exitloop:
+; exit : s->match_start=match_start
+    mov     ebx,match_start
+    mov     ebp,str_s
+    mov     ecx,best_len
+    mov     dword ptr [ebp+dep_match_start],ebx
+    mov     eax,dword ptr [ebp+dep_lookahead]
+    cmp     ecx,eax
+    ja      minexlo
+    mov     eax,ecx
+minexlo:
+; return min(best_len,s->lookahead)
+
+; restore stack and register ebx,esi,edi,ebp
+    add     esp,NbStackAdd
+
+    pop     ebx
+    pop     esi
+    pop     edi
+    pop     ebp
+    ret
+InfoAuthor:
+; please don't remove this string !
+; Your are free use gvmat32 in any fre or commercial apps if you don't remove the string in the binary!
+    db     0dh,0ah,"GVMat32 optimised assembly code written 1996-98 by Gilles Vollant",0dh,0ah
+
+
+
+IFDEF NOUNDERLINE
+longest_match_7fff   endp
+ELSE
+_longest_match_7fff  endp
+ENDIF
+
+
+IFDEF NOUNDERLINE
+cpudetect32     proc near
+ELSE
+_cpudetect32    proc near
+ENDIF
+
+    push    ebx
+
+    pushfd                  ; push original EFLAGS
+    pop     eax             ; get original EFLAGS
+    mov     ecx, eax        ; save original EFLAGS
+    xor     eax, 40000h     ; flip AC bit in EFLAGS
+    push    eax             ; save new EFLAGS value on stack
+    popfd                   ; replace current EFLAGS value
+    pushfd                  ; get new EFLAGS
+    pop     eax             ; store new EFLAGS in EAX
+    xor     eax, ecx        ; can’t toggle AC bit, processor=80386
+    jz      end_cpu_is_386  ; jump if 80386 processor
+    push    ecx
+    popfd                   ; restore AC bit in EFLAGS first
+
+    pushfd
+    pushfd
+    pop     ecx
+
+    mov     eax, ecx        ; get original EFLAGS
+    xor     eax, 200000h    ; flip ID bit in EFLAGS
+    push    eax             ; save new EFLAGS value on stack
+    popfd                   ; replace current EFLAGS value
+    pushfd                  ; get new EFLAGS
+    pop     eax             ; store new EFLAGS in EAX
+    popfd                   ; restore original EFLAGS
+    xor     eax, ecx        ; can’t toggle ID bit,
+    je      is_old_486      ; processor=old
+
+    mov     eax,1
+    db      0fh,0a2h        ;CPUID
+
+exitcpudetect:
+    pop ebx
+    ret
+
+end_cpu_is_386:
+    mov     eax,0300h
+    jmp     exitcpudetect
+
+is_old_486:
+    mov     eax,0400h
+    jmp     exitcpudetect
+
+IFDEF NOUNDERLINE
+cpudetect32     endp
+ELSE
+_cpudetect32    endp
+ENDIF
+ENDIF
+
+MAX_MATCH       equ     258
+MIN_MATCH       equ     3
+MIN_LOOKAHEAD   equ     (MAX_MATCH + MIN_MATCH + 1)
+MAX_MATCH_8_     equ     ((MAX_MATCH + 7) AND 0FFF0h)
+
+
+;;; stack frame offsets
+
+chainlenwmask   equ  esp + 0    ; high word: current chain len
+                    ; low word: s->wmask
+window      equ  esp + 4    ; local copy of s->window
+windowbestlen   equ  esp + 8    ; s->window + bestlen
+scanstart   equ  esp + 16   ; first two bytes of string
+scanend     equ  esp + 12   ; last two bytes of string
+scanalign   equ  esp + 20   ; dword-misalignment of string
+nicematch   equ  esp + 24   ; a good enough match size
+bestlen     equ  esp + 28   ; size of best match so far
+scan        equ  esp + 32   ; ptr to string wanting match
+
+LocalVarsSize   equ 36
+;   saved ebx   byte esp + 36
+;   saved edi   byte esp + 40
+;   saved esi   byte esp + 44
+;   saved ebp   byte esp + 48
+;   return address  byte esp + 52
+deflatestate    equ  esp + 56   ; the function arguments
+curmatch    equ  esp + 60
+
+;;; 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.)
+
+dsWSize     equ 36+zlib1222add
+dsWMask     equ 44+zlib1222add
+dsWindow    equ 48+zlib1222add
+dsPrev      equ 56+zlib1222add
+dsMatchLen  equ 88+zlib1222add
+dsPrevMatch equ 92+zlib1222add
+dsStrStart  equ 100+zlib1222add
+dsMatchStart    equ 104+zlib1222add
+dsLookahead equ 108+zlib1222add
+dsPrevLen   equ 112+zlib1222add
+dsMaxChainLen   equ 116+zlib1222add
+dsGoodMatch equ 132+zlib1222add
+dsNiceMatch equ 136+zlib1222add
+
+
+;;; match.asm -- Pentium-Pro-optimized version of longest_match()
+;;; Written for zlib 1.1.2
+;;; Copyright (C) 1998 Brian Raiter <breadbox@muppetlabs.com>
+;;; You can look at http://www.muppetlabs.com/~breadbox/software/assembly.html
+;;;
+;;; This is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License.
+
+;GLOBAL _longest_match, _match_init
+
+
+;SECTION    .text
+
+;;; uInt longest_match(deflate_state *deflatestate, IPos curmatch)
+
+;_longest_match:
+IFDEF NOOLDPENTIUMCODE
+    IFDEF NOUNDERLINE
+    longest_match       proc near
+    ELSE
+    _longest_match      proc near
+    ENDIF
+ELSE
+    IFDEF NOUNDERLINE
+    longest_match_686   proc near
+    ELSE
+    _longest_match_686  proc near
+    ENDIF
+ENDIF
+
+;;; Save registers that the compiler may be using, and adjust esp to
+;;; make room for our stack frame.
+
+        push    ebp
+        push    edi
+        push    esi
+        push    ebx
+        sub esp, LocalVarsSize
+
+;;; Retrieve the function arguments. ecx 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.
+
+        mov edx, [deflatestate]
+        mov ecx, [curmatch]
+
+;;; uInt wmask = s->w_mask;
+;;; unsigned chain_length = s->max_chain_length;
+;;; if (s->prev_length >= s->good_match) {
+;;;     chain_length >>= 2;
+;;; }
+
+        mov eax, [edx + dsPrevLen]
+        mov ebx, [edx + dsGoodMatch]
+        cmp eax, ebx
+        mov eax, [edx + dsWMask]
+        mov ebx, [edx + dsMaxChainLen]
+        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
+        mov [chainlenwmask], ebx
+
+;;; if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;
+
+        mov eax, [edx + dsNiceMatch]
+        mov ebx, [edx + dsLookahead]
+        cmp ebx, eax
+        jl  LookaheadLess
+        mov ebx, eax
+LookaheadLess:  mov [nicematch], ebx
+
+;;; register Bytef *scan = s->window + s->strstart;
+
+        mov esi, [edx + dsWindow]
+        mov [window], esi
+        mov ebp, [edx + dsStrStart]
+        lea edi, [esi + ebp]
+        mov [scan], edi
+
+;;; Determine how many bytes the scan ptr is off from being
+;;; dword-aligned.
+
+        mov eax, edi
+        neg eax
+        and eax, 3
+        mov [scanalign], eax
+
+;;; IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
+;;;     s->strstart - (IPos)MAX_DIST(s) : NIL;
+
+        mov eax, [edx + dsWSize]
+        sub eax, MIN_LOOKAHEAD
+        sub ebp, eax
+        jg  LimitPositive
+        xor ebp, ebp
+LimitPositive:
+
+;;; int best_len = s->prev_length;
+
+        mov eax, [edx + dsPrevLen]
+        mov [bestlen], eax
+
+;;; Store the sum of s->window + best_len in esi locally, and in esi.
+
+        add esi, eax
+        mov [windowbestlen], esi
+
+;;; register ush scan_start = *(ushf*)scan;
+;;; register ush scan_end   = *(ushf*)(scan+best_len-1);
+;;; Posf *prev = s->prev;
+
+        movzx   ebx, word ptr [edi]
+        mov [scanstart], ebx
+        movzx   ebx, word ptr [edi + eax - 1]
+        mov [scanend], ebx
+        mov edi, [edx + dsPrev]
+
+;;; Jump into the main loop.
+
+        mov edx, [chainlenwmask]
+        jmp short LoopEntry
+
+align 4
+
+;;; 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
+;;; ecx = curmatch
+;;; edx = chainlenwmask - i.e., ((chainlen << 16) | wmask)
+;;; esi = windowbestlen - i.e., (window + bestlen)
+;;; edi = prev
+;;; ebp = limit
+
+LookupLoop:
+        and ecx, edx
+        movzx   ecx, word ptr [edi + ecx*2]
+        cmp ecx, ebp
+        jbe LeaveNow
+        sub edx, 00010000h
+        js  LeaveNow
+LoopEntry:  movzx   eax, word ptr [esi + ecx - 1]
+        cmp eax, ebx
+        jnz LookupLoop
+        mov eax, [window]
+        movzx   eax, word ptr [eax + ecx]
+        cmp eax, [scanstart]
+        jnz LookupLoop
+
+;;; 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).
+
+        mov esi, [window]
+        mov edi, [scan]
+        add esi, ecx
+        mov eax, [scanalign]
+        mov edx, 0fffffef8h; -(MAX_MATCH_8)
+        lea edi, [edi + eax + 0108h] ;MAX_MATCH_8]
+        lea esi, [esi + eax + 0108h] ;MAX_MATCH_8]
+
+;;; Test the strings for equality, 8 bytes at a time. At the end,
+;;; adjust edx 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. (esi 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 eax, [esi + edx]
+        xor eax, [edi + edx]
+        jnz LeaveLoopCmps
+        mov eax, [esi + edx + 4]
+        xor eax, [edi + edx + 4]
+        jnz LeaveLoopCmps4
+        add edx, 8
+        jnz LoopCmps
+        jmp short LenMaximum
+LeaveLoopCmps4: add edx, 4
+LeaveLoopCmps:  test    eax, 0000FFFFh
+        jnz LenLower
+        add edx,  2
+        shr eax, 16
+LenLower:   sub al, 1
+        adc edx, 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 eax, [edi + edx]
+        mov edi, [scan]
+        sub eax, edi
+        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.
+
+        mov edx, [deflatestate]
+        mov ebx, [bestlen]
+        cmp eax, ebx
+        jg  LongerMatch
+        mov esi, [windowbestlen]
+        mov edi, [edx + dsPrev]
+        mov ebx, [scanend]
+        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 ebx, [nicematch]
+        mov [bestlen], eax
+        mov [edx + dsMatchStart], ecx
+        cmp eax, ebx
+        jge LeaveNow
+        mov esi, [window]
+        add esi, eax
+        mov [windowbestlen], esi
+        movzx   ebx, word ptr [edi + eax - 1]
+        mov edi, [edx + dsPrev]
+        mov [scanend], ebx
+        mov edx, [chainlenwmask]
+        jmp LookupLoop
+
+;;; Accept the current string, with the maximum possible length.
+
+LenMaximum: mov edx, [deflatestate]
+        mov dword ptr [bestlen], MAX_MATCH
+        mov [edx + dsMatchStart], ecx
+
+;;; if ((uInt)best_len <= s->lookahead) return (uInt)best_len;
+;;; return s->lookahead;
+
+LeaveNow:
+        mov edx, [deflatestate]
+        mov ebx, [bestlen]
+        mov eax, [edx + dsLookahead]
+        cmp ebx, eax
+        jg  LookaheadRet
+        mov eax, ebx
+LookaheadRet:
+
+;;; Restore the stack and return from whence we came.
+
+        add esp, LocalVarsSize
+        pop ebx
+        pop esi
+        pop edi
+        pop ebp
+
+        ret
+; please don't remove this string !
+; Your can freely use gvmat32 in any free or commercial app if you don't remove the string in the binary!
+    db     0dh,0ah,"asm686 with masm, optimised assembly code from Brian Raiter, written 1998",0dh,0ah
+
+
+IFDEF NOOLDPENTIUMCODE
+    IFDEF NOUNDERLINE
+    longest_match       endp
+    ELSE
+    _longest_match      endp
+    ENDIF
+
+    IFDEF NOUNDERLINE
+    match_init      proc near
+                    ret
+    match_init      endp
+    ELSE
+    _match_init     proc near
+                    ret
+    _match_init     endp
+    ENDIF    
+ELSE
+    IFDEF NOUNDERLINE
+    longest_match_686   endp
+    ELSE
+    _longest_match_686  endp
+    ENDIF
+ENDIF
+
+_TEXT   ends
+end