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tsfc: contract each block after unconcatenating #5297

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tsfc: contract each block after unconcatenating #5297

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6 changes: 6 additions & 0 deletions tsfc/driver.py
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Original file line number Diff line number Diff line change
Expand Up @@ -390,6 +390,12 @@ def predicate(index):
# but we don't for now.
evaluation, = impero_utils.preprocess_gem([evaluation])
pairs = unconcatenate([(return_expr, evaluation)], cache=concatenate_cache)
# Contract each block once the Concatenate nodes are gone. An H(div) or
# H(curl) element selects the component each block maps to with a Delta,
# and only here, with the blocks separated, do those Deltas meet pairwise
# and cancel the pairs that map to different components.
pairs = [(variable, gem.optimise.contraction(expression))
for variable, expression in pairs]
impero_c = impero_utils.compile_gem(pairs, return_indices)
index_names = {idx: f"p{i}" for (i, idx) in enumerate(basis_indices)}
# Handle kernel interface requirements
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