[antlr-interest] Is this Recognizer optimization valid [more details]

[mzukowski at bco.com]

Looks good to me.

Monty

-----Original Message-----
From: Sander Mägi [mailto:sander at aqris.com]
Sent: Tuesday, October 02, 2001 6:56 AM
To: antlr-interest at yahoogroups.com
Subject: [antlr-interest] Is this Recognizer optimization valid [more
details]


 
Did the measurments and original version generated 30% more ASTPair objects.
----- Original Message ----- 
From: Sander Mägi 
To: ANTLR 
Sent: Tuesday, October 02, 2001 3:48 PM
Subject: [antlr-interest] Is this Recognizer optimization valid?


Hi
 
I did some search and replace on my JavaRecognizer.java file (from java.g)
to gain speed and memory - it seems to work in my tests.
 
Maybe someone can confirm that this optimization is indeed correct.
 
I defined a variable:
private static final ASTPair NULL_PAIR = new ASTPair();

And replaced all occurences of 'new ASTPair()' with
'(inputState.guessing==0)?new ASTPair():NULL_PAIR;'
 
This makes garbage collector very happy and makes program a bit faster too.
 
br,
Sander Mägi

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