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Roland Scheidegger authored
In 1d35f772 support for multiple constant buffers was introduced. This meant we had another indirection, and we did resolve the indirection for each constant buffer access. This looks very reasonable since llvm can figure out if it's the same pointer, however it turns out that this can cause llvm compilation time to go through the roof and beyond (I've seen cases in excess of factor 100, e.g. from 50 ms to more than 10 seconds (!)), with all the additional time spent in IR optimization passes (and in the end all of it in DominatorTree::dominate()). I've been unable to narrow it down a bit more (only some shaders seem affected, seemingly without much correlation to overall shader complexity or constant usage) but it is easily avoidable by doing the buffer lookups themeselves just once (at constant buffer declaration time). Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
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