[LLVMbugs] [Bug 436] NEW: [interpreter/jit] Data layout broken for arch's with wierd alignment requirements

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=436

           Summary: [interpreter/jit] Data layout broken for arch's with
                    wierd alignment requirements
           Product: libraries
           Version: 1.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Generic Execution Engine Support
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sabre at nondot.org


The ExecutionEngine::LoadValueFromMemory, and StoreValueToMemory methods in
lib/ExecutionEngine/ExecutionEngine.cpp do not work on architectures that have
strange alignment requirements.  For example, on PPC, bool has an alignment of 4
bytes, and the target is big-endian.  The code in those methods stores the 0 or
1 in the wrong byte.

These methods are used to initialize global variables for the JIT and
interpreter, and is used to handle load/store instructions for the interpreter.
 They are both performance critical, so whatever is done shouldn't be too slow.

-Chris



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