[antlr-interest] attempt to compare antlr vs bison/flex performance

[Terence Parr]

On Dec 19, 2007, at 3:31 PM, Johannes Luber wrote:

> Minas Hambardzumyan schrieb:
>> Although the grammar definitions come from different sources, I still
>> think this exercise gives a general idea about performance  
>> differences
>> of these parsers. Could anyone please tell me if this is an expected
>> runtime difference or you think I could do some optimizations to get
>> faster performance from antlr3.
>
> I know that in the perforce repository the current source is  
> supposed to
> perform at least 50% better than the one available. So it is  
> possible to
> optimize stuff. But Ter should know more about this.

I'm working on ANTLR's analysis engine with Kay Roepke.  A TSQL  
grammar that took 1m30s is now taking about 10s!  I have not optimized  
the runtime.

Also note that the C grammar for v3 is optimized for readability not  
at all for speed.  It is not LL(1) by any stretch.  I could alter to  
be superfast but less readable...

Ter