[Mesa-dev] [PATCH 00/10] [RFC] Probably useless algebraic optimizations

Thomas Helland thomashelland90 at gmail.com
Wed Jul 16 15:30:43 PDT 2014

>Some of these optimizations are pretty obscure and I can't imagine a
>real shader hitting them.

Some of these optimizations are indeed obscure.
Only reason I can think of for any of these
to succeed are if some other optimizations
has pushed constants up the tree, or eliminated things.

>What's the cost of checking for these cases?  I don't know how expensive
>the equals() methods are.

The time it takes to run a shader-db run on my machine
has remained pretty constant when adding these.
(Within 140 +/- 5 seconds).

>Do we want to litter the optimizer with cases that may never be used in

Obviously we don't want to fill our optimizer with junk.
If nobody sees these as useful, then lets not waste more
time on them, and get on with more important things.

(This mail wll probably not get threaded properly,
 shitty gmail web interface)


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