[LLVMbugs] [Bug 12156] New: [ADT] Create a SmallPtrMap type

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12156

             Bug #: 12156
           Summary: [ADT] Create a SmallPtrMap type
           Product: libraries
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Core LLVM classes
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: daniel at zuster.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


There are a number of places in the compiler where we could make good use of a
SmallPtrMap ADT (a map with a small stack allocated buffer).

For example, in:
  http://llvm.org/viewvc/llvm-project?view=rev&revision=151697
I ended up caching some DenseMaps that were being allocated many many times,
but in practice these maps are very small, it would be much cleaner to use a
local SmallPtrMap.

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