Sv/local matfree pr rebased150522#283

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sv/local-matfree-pr-rebased150522

Commits on Jun 15, 2022

GEM: introduce new nodes in GEM to faciliate locally matrix-free methods. The Solve node can now be specialised into being matrix-explicit or matrix-free. A new node called Action is introduced alo…
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GEM2Loopy: Translate the matrix-free Solve and the Action node to loopy instructions.
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GEM2Loopy: minor changes, mostly to make more information available to components reusing the infrastructure for the loopy kernel generation.
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UFL2GEM: querying the number of an argument in a form for a form where one of the arguments got replaced by a coefficient does not yield the correct index. This is a workaround for that.
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Set targets from params
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WIP add stop criterion that is controllable from the outside
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WIP make it easier to add extra args to Solves
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WIP make it easier to add extra args to Solves
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GEM: add preconditioning to Solve node
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Gem2Loopy: pass preconditioner to matf solve call too
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With preconditioning
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Local matf solve: add a maxit argument to control the solver.
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Commits on Jul 18, 2022

Add insn_count_subgroups_upper_bound warning in all our Loo.py kernel generation functions.
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