[Mesa-dev] Common Subexpression Elimination

[Vincent]

Hi,

I wrote an optimisation pass that perform CSE (that is, it spots 
expressions that appears twice or more, and factor them in a temporary 
to avoid recalculation).
This is my first patch to Mesa, I would like to receive feedback : case 
where the algorithm does not work, crashes, ...
I tried to follow coding style, using exec_list*, ralloced objects...
The algorithm currently only spot binary expressions (that is x + y, x * 
y, ...) but unary expression (exp(x), ln(x)...) should follow soon.

Regards,
Vincent.
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