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-rw-r--r--third_party/zlib/contrib/masmx64/gvmat64.asm1106
1 files changed, 553 insertions, 553 deletions
diff --git a/third_party/zlib/contrib/masmx64/gvmat64.asm b/third_party/zlib/contrib/masmx64/gvmat64.asm
index 9879c28b90..c1817f1be9 100644
--- a/third_party/zlib/contrib/masmx64/gvmat64.asm
+++ b/third_party/zlib/contrib/masmx64/gvmat64.asm
@@ -1,553 +1,553 @@
-;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
+;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
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