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6523aca729
Corrected spelling in copyright text Makefile.am: Don't update the files from BitKeeper Many files: Removed "MySQL Finland AB & TCX DataKonsult AB" from copyright header Adjusted year(s) in copyright header Many files: Added GPL copyright text Removed files: Docs/Support/colspec-fix.pl Docs/Support/docbook-fixup.pl Docs/Support/docbook-prefix.pl Docs/Support/docbook-split Docs/Support/make-docbook Docs/Support/make-makefile Docs/Support/test-make-manual Docs/Support/test-make-manual-de Docs/Support/xwf
181 lines
3.3 KiB
NASM
181 lines
3.3 KiB
NASM
; Copyright (C) 2000 MySQL AB
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;
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; This library is free software; you can redistribute it and/or
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; modify it under the terms of the GNU Library General Public
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; License as published by the Free Software Foundation; version 2
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; of the License.
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;
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; This library is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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; Library General Public License for more details.
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;
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; You should have received a copy of the GNU Library General Public
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; License along with this library; if not, write to the Free
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; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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; MA 02111-1307, USA
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TITLE Optimized cmp of pointer to strings of unsigned chars
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ifndef M_I386
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.8087
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DOSSEG
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.MODEL LARGE
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.DATA
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compare_length dw 0
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.CODE STRINGS
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PUBLIC _get_ptr_compare
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_get_ptr_compare PROC
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mov bx,sp
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mov cx,ss:[BX+4]
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mov compare_length,cx
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mov dx,seg strings:_ptr_cmp
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mov ax,offset _ptr_cmp_0
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jcxz @F
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mov ax,offset _ptr_cmp_1
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dec cx
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jz @F
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mov ax,offset _ptr_cmp
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@@: ret
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_get_ptr_compare ENDP
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_ptr_cmp_0 PROC
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mov AX,0 ; Emptyt strings are always equal
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ret
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_ptr_cmp_0 ENDP
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_ptr_cmp_1 PROC
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mov bx,sp
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mov dx,si ; Save si and ds
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mov cx,ds
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lds si,DWORD PTR ss:[bx+4] ; s1
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lds si,DWORD PTR ds:[si]
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mov al,ds:[si]
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xor ah,ah
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lds si,DWORD PTR ss:[bx+8] ; s2
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lds si,DWORD PTR ds:[si]
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mov bl,ds:[si]
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mov bh,ah
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sub ax,bx
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mov ds,cx ; restore si and ds
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mov si,dx
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ret
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_ptr_cmp_1 ENDP
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_ptr_cmp PROC
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mov bx,bp ; Save bp
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mov dx,di ; Save di
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mov bp,sp
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push ds
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push si
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mov cx,compare_length ; Length of memory-area
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lds si,DWORD PTR [bp+4] ; s1
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lds si,DWORD PTR ds:[si]
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les di,DWORD PTR [bp+8] ; s2
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les di,DWORD PTR es:[di]
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; cld ; Work uppward
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xor ax,ax
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repe cmpsb ; Compare strings
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je @F ; Strings are equal
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sbb ax,ax
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cmc
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adc ax,0
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@@: pop si
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pop ds
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mov di,dx
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mov bp,bx
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ret
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_ptr_cmp ENDP
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else
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include macros.asm
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fix_es MACRO fix_cld ; Load ES if neaded
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ife ESeqDS
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mov ax,ds
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mov es,ax
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endif
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ifnb <fix_cld>
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cld
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endif
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ENDM
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begdata
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compare_length dd 0 ; Length of strings
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enddata
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begcode get_ptr_compare
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public _get_ptr_compare
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_get_ptr_compare proc near
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mov ecx,P-SIZEPTR[esp]
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mov compare_length,ecx
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mov eax,offset _TEXT:_ptr_cmp_0
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jecxz @F
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mov eax,offset _TEXT:_ptr_cmp_1
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dec ecx
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jz @F
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mov eax,offset _TEXT:_ptr_cmp
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@@: ret
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_get_ptr_compare endp
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endcode _get_ptr_compare
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begcode ptr_cmp_0
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_ptr_cmp_0 PROC
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mov EAX,0 ; Emptyt strings are always equal
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ret
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_ptr_cmp_0 ENDP
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endcode ptr_cmp_0
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begcode ptr_cmp_1
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_ptr_cmp_1 proc near
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mov edx,esi ; Save esi
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mov esi,P-SIZEPTR[esp] ; *s1
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mov esi,[esi]
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movzx eax,[esi]
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mov esi,P[esp] ; *s2
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mov esi,[esi]
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movzx ecx,[esi]
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sub eax,ecx
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mov esi,edx ; Restore esi
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ret
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_ptr_cmp_1 ENDP
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endcode ptr_cmp_1
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begcode ptr_cmp
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_ptr_cmp proc near
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fix_es 1
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push ebp
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mov ebp,esp
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mov edx,edi ; Save esi
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push esi
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mov esi,P[ebp] ; *s1
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mov esi,[esi]
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mov edi,P+SIZEPTR[ebp] ; *s2
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mov edi,[edi]
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mov ecx,compare_length ; Length of memory-area
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xor eax,eax
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repe cmpsb ; Compare strings
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je @F ; Strings are equal
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sbb eax,eax
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cmc
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adc eax,0
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@@: pop esi
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mov edi,edx
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pop ebp
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ret
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_ptr_cmp ENDP
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endcode ptr_cmp
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endif
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END
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