Mehdi Amini a506279e5c [mlir] Do not merge blocks during canonicalization by default (#95057) ...

This is a heavy process, and it can trigger a massive explosion in
adding block arguments. While potentially reducing the code size, the
resulting merged blocks with arguments are hiding some of the def-use
chain and can even hinder some further analyses/optimizations: a merge
block does not have it's own path-sensitive context, instead the context
is merged from all the predecessors.

Previous behavior can be restored by passing:

  {test-convergence region-simplify=aggressive}

to the canonicalize pass.

2024-06-14 22:38:56 +02:00

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