[llvm-bugs] [Bug 28322] New: [PM] Remove use of old PM in the middle-end.

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28322

            Bug ID: 28322
           Summary: [PM] Remove use of old PM in the middle-end.
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: chisophugis at gmail.com
                CC: llvm-bugs at lists.llvm.org
            Blocks: 28315
    Classification: Unclassified

Right now, each pass/analysis we port has to keep a legacy shim which is
actually a nontrivial amount of code (although it varies from pass to pass).
Perhaps most importantly it forces awkward patterns for the core pass logic,
essentially requiring there to be 3 interfaces to be implemented:

1. the old PM interface
2. the new PM interface
3. a weird (and inconsistent across passes) meta-interface that both 1. and 2.
can be implemented in terms of.

Often, 3. takes the form of passing in the analysis objects explicitly or
passing a callback that lazily constructs them.

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