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CD ROM Paradise Collection 4
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CD ROM Paradise Collection 4 1995 Nov.iso
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STRINGS.SWG
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0104_Super FAST upcase.pas
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Pascal/Delphi Source File
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1995-03-03
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5KB
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116 lines
{
To SWAG (group STRINGS.SWG)
Jose Campione claimed that he had the fastest upperstring,
I proved otherwise. Look at the difference in speed
between TXLat5 of Jose Campione and mine.
The following benchmarking was done in a 486/DX 60 MHz using
Neil Rubenking's TimeTick unit while upcasing a full string
(255 chars) 400,000 times (100 million characters):
For-Do loop using TP7 UpCase() .......... 315.5 secs.
UpperCase (Assembler classical approach) 53.9 secs. (1)
My old TXlat3 ........................... 28.3 secs. (2)
Translate ............................... 26.8 secs. (3)
TXlat5 .................................. 21.2 secs.
SUPERFASTUPSTRING ....................... 17.1 secs. (!)
Oscar N. Verzaal (bkverzaa@sus.edu.eur.nl)
}
Program UpString;
uses Crt, Dos;
type
ByteArray = array[0..255] of byte;
var
Source1,
Source : string;
Table : ByteArray;
k, nr : longint;
u, m, s, s100 : word;
tm1, tm2, t1, t2 : real;
Procedure TXlat5(var Source: string; var Table: ByteArray);assembler;
asm
mov dx, ds { save ds }
lds bx,Table { load ds:bx with Table address }
les di,Source { load es:di with Source address }
seges { override ds segment}
mov al,[di] { load al with length of source }
xor ah, ah { set ah to zero, we need a word for cx }
mov cx,ax { assign length of source to counter }
jcxz @end { if cx = 0 exit}
inc di { increment di & skip length byte on 1st pass }
@filter:
mov al,[di] { load byte in ax from es:di }
xlat { tan-xlat-e... }
mov [di],al { send byte to es:di }
inc di { increment di }
loop @filter { decrement cx and loop back if cx > 0 }
@end: mov ds, dx { restore ds }
end;
Procedure SuperFastUpString(var Source, Table);
inline($8C/$DA/ { mov dx, ds }
$5B/ { pop bx | lds bx, Table }
$1F/ { pop ds | }
$5F/ { pop di | les di, Source }
$07/ { pop es | }
$8A/$0D/ { mov cl, [di] }
$08/$C9/ { or cl, cl }
$74/$0F/ { jz @end }
$30/$ED/ { xor ch, ch }
$47/ { inc di }
{ @loop: }
$8A/$05/ { mov al, [di] }
$D7/ { xlat }
$88/$05/ { mov [di], al }
$47/ { inc di }
$49/ { dec cx }
$75/$F7/ { jnz @loop }
{ @end: }
$8E/$DA); { mov ds, dx }
begin
ClrScr;
nr:=400000;
writeln('Number of times ',nr:6);
writeln('----------------------');
for k:= 0 to 255 do
if k in [$61..$7A] then Table[k]:= k - $20 else Table[k]:= k;
Source1:= 'this string is to be upcased this string is to be upcased this string is to be upcased '+
'this string is to be upcased this string is to be upcased this string is to be upcased '+
'this string is to be upcased this string is to be upcased this string is to be u.';
Source := Source1;
GetTime(u, m, s, s100);
t1 := (u*3600) + (m*60) + s + (s100/100);
for k:=1 to nr do TXLat5(Source, Table);
GetTime(u, m, s, s100);
t2 := (u*3600) + (m*60) + s + (s100/100);
tm1 := t2 - t1;
writeln('TXLat5 took ',tm1:5:2,'sec');
Source := Source1;
GetTime(u, m, s, s100);
t1 := (u*3600) + (m*60) + s + (s100/100);
for k:=1 to nr do SuperFastUpString(Source, Table);
GetTime(u, m, s, s100);
t2 := (u*3600) + (m*60) + s + (s100/100);
tm2 := t2 - t1;
writeln('SuperFastUpString took ',tm2:5:2,'sec');
writeln;
writeln('Speed advantage of SuperFastUpString over TXlat5 is ',100*((tm1 - tm2) / tm1):6:2,'%');
end.