Equivalence Pattern Rewriter to integrate expansion of Softmax into equality saturation#5655
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szerdick wants to merge 87 commits intoxdslproject:jumerckx/interp_ematchfrom
Open
Equivalence Pattern Rewriter to integrate expansion of Softmax into equality saturation#5655szerdick wants to merge 87 commits intoxdslproject:jumerckx/interp_ematchfrom
szerdick wants to merge 87 commits intoxdslproject:jumerckx/interp_ematchfrom
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With the foreach approach, I believe part of this logic can be simplified/omitted, but this is a good first step.
We need to be more careful with the bindings selected by matchers. Right now, values are sometimes passed as their class result to a rewriter: ``` x = … y = … c = class x, y rewrite “myrewrite”(c) ``` This is problematic in MLIR as other rewrites can invalidate c. While we are guaranteed to not erase any operation in the “program domain”, this is not true for the operations of the “e-graph domain”. The solution is to ensure in the pdl lowering that only values from the program domain are passed to rewriters and the conversion to e-graph domain happens at the latest possible point, in the rewriter itself. (This is not an issue in xDSL because erasing an e-class does not discard of the object)
non-eqsat lowering should stay the same
(not entirely done) Co-authored-by: Sasha Lopoukhine <superlopuh@gmail.com>
to show how it should be done, the change would also need to be made to apply_eqsat_pdl.
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