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[RFC-ish][MIR] Add a pass manager #31448

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[RFC-ish][MIR] Add a pass manager #31448

wants to merge 5 commits into from

Commits on Feb 15, 2016

  1. Reuse MIR visitors for EraseRegions pass

    @nagisa
    nagisa committed Feb 15, 2016
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  2. Add MIR pass manager and tier-ed passes. 

    Tiered passes allow to avoid some of the introspection of MIR map for passes which do not need it
and perhaps improve performance of the more-restricted passes (i.e. BlockPasses could be run in
parallel regardless of function for which the block belongs). It also could allow to e.g. run dead
block removal only after passes which modify the CFG graph and not after those which only change
blocks.
    @nagisa
    nagisa committed Feb 15, 2016
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  3. Split SimplifyCfg pass into smaller passes 

    Previously SimplifyCfg pass was unecessarily interleaving many different functions – actual
simplification, dead block removal and compaction. This patch splits off dead block removal and
compaction into their own passes.
    @nagisa
    nagisa committed Feb 15, 2016
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  4. Factor out MIR printer into a pass

    @nagisa
    nagisa committed Feb 15, 2016
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  5. Address comments

    @nagisa
    nagisa committed Feb 15, 2016
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