[LLVMbugs] [Bug 14353] New: TLS variables should not be Constant

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14353

             Bug #: 14353
           Summary: TLS variables should not be Constant
           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: hans at chromium.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


TLS variables are a special case of GlobalVariable, which inherit from
Constant.

But a TLS variable is not really Constant, it is different for different
threads. This can cause subtle bugs, such as Bug 14309, if the optimizers fail
to take it into account.

Some discussion here:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20121112/155805.html

It would be good if we could find a way so that TLS variables were not Constant
to avoid optimizers getting this wrong.

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