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Re: PCH, and more generally C++ parser performance


On Sun, Aug 27, 2000 at 05:32:02PM -0700, Mark Mitchell wrote:
> >>>>> "Zack" == Zack Weinberg <zack@wolery.cumb.org> writes:
> 
> You're now gradually redoing all the research I did a few months
> ago... :-)  Good science, you're duplicating my results. :-)

Heh.

I can't do anything but research until my outstanding patches get
reviewed (hint, hint) so I might as well do research. :)

>     Zack> I'm a bit surprised at the size and number of INTEGER_CST
>     Zack> nodes.  Aren't they being allocated uniquely?  (looks) No
>     Zack> they aren't, I was thinking of CONST_INTs.  Maybe I'll make
>     Zack> INTEGER_CSTs be allocated uniquely too.  A bit of perl
> 
> Careful, that won't work if you do it in the obvious way.  Some parts
> of the compiler treat INTEGER_CST nodes as mutable.  I started trying
> to fix this, but didn't finish. :-(

Yep, just discovered that myself.  Also that the type of an
INTEGER_CST matters.  It's a bit too big of a problem for me to tackle
right now.

zw

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