[LLVMbugs] [Bug 20524] New: Faulty code generation for -O2 when using custom allocator with fancy pointer

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20524

            Bug ID: 20524
           Summary: Faulty code generation for -O2 when using custom
                    allocator with fancy pointer
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++1y
          Assignee: unassignedclangbugs at nondot.org
          Reporter: tkoeppe at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 12853
  --> http://llvm.org/bugs/attachment.cgi?id=12853&action=edit
Custom allocator/pointer example that doesn't compile correctly with -O2

I have no particular insight in what's going on here, other than that there's a
very similar problem in GCC. Please see the attached code: Compiled with -O1 it
works, but with -O2 it is broken (the map doesn't contain the right content,
and Valgrind shows memory errors).

The code instantiates an std::map with a simple, custom allocator that uses a
fancy pointer.

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