[LLVMbugs] [Bug 22111] New: Add concept of 'distinct' MDNodes

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Jan 6 17:03:58 PST 2015


            Bug ID: 22111
           Summary: Add concept of 'distinct' MDNodes
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Core LLVM classes
          Assignee: unassignedbugs at nondot.org
          Reporter: dexonsmith at apple.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

We should have the ability to explicitly create distinct MDNodes, which are not
uniqued, without having to resort to self-references.

This is relatively easy:

 1. Add API.
 2. Add assembly and bitcode support for saving this bit (it's already used
under the hood for uniquing collisions, but it's not serialized).
 3. Add logic to `ValueMap` so that it's kept there too.

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