[Mesa-dev] Reducing GLSL compiler optimization time

Ian Romanick idr at freedesktop.org
Mon Mar 14 14:34:22 PDT 2011

Hash: SHA1

On 03/11/2011 04:06 PM, Eric Anholt wrote:
> With the conversion of texenvprogram to producing GLSL IR, all those
> nice little optimization passes end up slowing down our
> combinatorial-explosion ff tests pretty significantly.  This patch
> series reduces glean texCombine runtime overall by 20% on my gen6
> system.  The lowest-hanging fruit at this point looks like the
> register allocator setup, which I think a 1-entry cache would cut down
> pretty easily.
> Surprisingly enough, making the refcount visitor use a hash table
> didn't pay off in reducing its couple of percent, as the cost of
> alloc/free of the hash table was too high.  This branch is present as
> glsl-refcount-ht of my tree if you might have a workload where it
> helps -- it was a non-statistically-significant change here.

1, 2, 4 (lol), 6, 7 look good as-is.  Reviewed-by: Ian Romanick
<ian.d.romanick at intel.com>

I posted a reply to 3 that may make 3 and 5 irrelevant.  We may decid to
commit them anyway.  Dunno.

I shared Ken's issues with 8 and 9, but those appear to be resolved.
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