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I am not sure, but it is very likely that xlate will use a 256 byte array,
use the input char as index and return the value from that position.
It should be very fast, no comparations.

On Mon, Nov 22, 2021 at 10:06 AM Francois Lavoie <
Francois.Lavoie@xxxxxxxxxxxxxxxxxxxx> wrote:

Why did u put the Xlate inside a for loop??
The Xlate *will* loop every char in the str parm
Remove the For/EndFor and time test it again

-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Jon
Sent: Friday, November 19, 2021 11:18
To: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: [EXTERNAL] Remove unprintable chars

My first thought was the same as Bruce's - that an individual character
loop would be by far the fastest approach.

You always have to remember that no magic is involved and that in order to
implement %Xlate or %ScanRpl RPG still has to implement a character at a
time loop unless there is can underlying system function that can perform
the task - and even then that just moves that loop down closer to the

But so many in this thread seemed convinced that the BIF approach would be
faster I decided to test and compare Francois' code with a simple loop.

The time difference is dramatic. The single char loop is orders of
magnitude faster.

Run the following and see for yourself. On my system I get the following:

DSPLY Xlate took: 1094
DSPLY Loop took: 59

And those results are consistent.

Here's the code I used - if you spot a bug let me know.


dcl-ds str;
strChar char(1) Dim(1000);

dcl-s blank64 char(64) inz;
dcl-s i int(5);
dcl-s startTime timestamp;
dcl-s endTime timestamp;

startTime = %timestamp();

for i = 1 to %elem(strChar);

str = X'12' + 'some string' +X'350A13';
str = %Xlate(X'000102030405060708090A0B0C0D0E0F+
: blank64

endTime = %timestamp();

Dsply ( 'Xlate took: ' + %char(%diff( endTime : startTime : *MS )));

startTime = %timestamp();

for i = 1 to %elem(strChar);

if strChar(i) < X'40';
strChar(i) = *Blank;


endTime = %timestamp();

Dsply ( 'Loop took: ' + %char(%diff( endTime : startTime : *MS )));

*InLr = *On;

On Nov 18, 2021, at 6:45 PM, Francois Lavoie <
Francois.Lavoie@xxxxxxxxxxxxxxxxxxxx> wrote:

Here's the code I tested: ultra fast and ultra compact. A 1-liner
beats any slow do 1-char at a time multi-line of code loop dcl-s str

str=X'12'+'some string'+X'350A13';
:' '+
' '

make sure the 2nd parm of the Xlate bif has exactly 64 blanks

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