KOL Format/wvsprintf performance hit

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Freeman © (2008-07-14 02:59) [0]

function Format(const Fmt: string; const Args: array of const): string; asm PUSH ESI PUSH EDI PUSH EBX MOV EBX, ESP ADD ESP, -2048 MOV ESI, ESP INC ECX JZ @@2 @@1: MOV EDI, [EDX + ECX*8 - 8] PUSH EDI LOOP @@1 @@2: PUSH ESP PUSH EAX PUSH ESI CALL wvsprintf MOV EDX, ESI MOV ECX, EAX // by Freeman MOV EAX, @Result CALL System.@LStrFromPCharLen // by Freeman, performance hit MOV ESP, EBX POP EBX POP EDI POP ESI end;

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Thaddy (2008-07-14 11:48) [1]

Not really strange:

I suppose you are using the unicode version of wvsprintf?
In that case you should call LStrFromPWCharLen.
Otherwise you get a performance hit because the unicodestring gets converted to string in the background by the OS.

Also it is a good idea to use kolstring instead of string.

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Freeman © (2008-07-15 02:34) [2]

He-he. In my project (not KOL-based) I"m using these snippets:

function FormatBuf(Fmt: PAnsiChar; Args: array of const; Buf: PAnsiChar): Integer; asm PUSH EDI INC ECX JZ @@2 @@1: MOV EDI, [EDX + ECX*8 - 8] PUSH EDI LOOP @@1 @@2: PUSH ESP PUSH EAX MOV EDI, Buf PUSH EDI CALL wvsprintfA POP EDI end; function WideFormatBuf(Fmt: PWideChar; Args: array of const; Buf: PWideChar): Integer; asm PUSH EDI INC ECX JZ @@2 @@1: MOV EDI, [EDX + ECX*8 - 8] PUSH EDI LOOP @@1 @@2: PUSH ESP PUSH EAX MOV EDI, Buf PUSH EDI CALL wvsprintfW POP EDI end;

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Thaddy (2008-07-21 17:38) [3]

This would be a start to work with kol strings.
function FormatBuf(Fmt: PAnsiChar; Args: array of const; Buf: PAnsiChar): Integer;overload; asm PUSH EDI INC ECX JZ @@2 @@1: MOV EDI, [EDX + ECX*8 - 8] PUSH EDI LOOP @@1 @@2: PUSH ESP PUSH EAX MOV EDI, Buf PUSH EDI CALL wvsprintfA POP EDI end; function FormatBuf(Fmt: PWideChar; Args: array of const; Buf: PWideChar): Integer;overload; asm PUSH EDI INC ECX JZ @@2 @@1: MOV EDI, [EDX + ECX*8 - 8] PUSH EDI LOOP @@1 @@2: PUSH ESP PUSH EAX MOV EDI, Buf PUSH EDI CALL wvsprintfW POP EDI end;

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