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Diffstat (limited to 'zlib/contrib/asm386/gvmat32.asm')
| -rw-r--r-- | zlib/contrib/asm386/gvmat32.asm | 559 |
1 files changed, 559 insertions, 0 deletions
diff --git a/zlib/contrib/asm386/gvmat32.asm b/zlib/contrib/asm386/gvmat32.asm new file mode 100644 index 00000000000..28d527f47f8 --- /dev/null +++ b/zlib/contrib/asm386/gvmat32.asm @@ -0,0 +1,559 @@ +; +; 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 +; It need wmask == 0x7fff +; (assembly code is faster with a fixed wmask) +; +; For Visual C++ 4.2 and ML 6.11c (version in directory \MASM611C of Win95 DDK) +; I compile with : "ml /coff /Zi /c gvmat32.asm" +; + +;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 +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 + dep_chain_length equ 70h+4 + dep_window equ 2ch+4 + dep_strstart equ 60h+4 + dep_prev_length equ 6ch+4 + dep_nice_match equ 84h+4 + dep_w_size equ 20h+4 + dep_prev equ 34h+4 + dep_w_mask equ 28h+4 + dep_good_match equ 80h+4 + dep_match_start equ 64h+4 + dep_lookahead equ 68h+4 + + +_TEXT segment + +IFDEF NOUNDERLINE + public longest_match_7fff +; public match_init +ELSE + public _longest_match_7fff +; public _match_init +ENDIF + + MAX_MATCH equ 258 + MIN_MATCH equ 3 + MIN_LOOKAHEAD equ (MAX_MATCH+MIN_MATCH+1) + + + +IFDEF NOUNDERLINE +;match_init proc near +; ret +;match_init endp +ELSE +;_match_init proc near +; ret +;_match_init endp +ENDIF + + +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 + + + 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: + 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 + +_TEXT ends +end |