[llvm-dev] uninitialized values in Attributes.cpp

[regehr via llvm-dev]

> We should first confirm that there is actually a problem. At least on some platforms (e.g. PowerPC), valgrind's ability to accurately track uses of undefined data is limited.

Sure, I'm happy to do legwork here but not sure how to proceed.

I'll add that I still have a number (~300) of valgrind-related problems 
that show up for an LLVM built using Clang, but not for one built using 
GCC.  A typical one is below.  We should definitely get to the bottom of 
these.

John




FAIL: LLVM :: CodeGen/ARM/2011-01-19-MergedGlobalDbg.ll (4514 of 18737)
******************** TEST 'LLVM :: 
CodeGen/ARM/2011-01-19-MergedGlobalDbg.ll' FAILED ********************
Script:
--
/home/regehr/llvm/build-llvmtrunk-vgtest/./bin/llc -arm-global-merge 
-global-merge-group-by-use=false -filetype=obj < 
/home/regehr/llvm/test/CodeGen/ARM/2011-01-19-MergedGlobalDbg.ll | 
/home/regehr/llvm/build-llvmtrunk-vgtest/./bin/llvm-dwarfdump 
-debug-dump=info - | 
/home/regehr/llvm/build-llvmtrunk-vgtest/./bin/FileCheck 
/home/regehr/llvm/test/CodeGen/ARM/2011-01-19-MergedGlobalDbg.ll
--
Exit Code: 123

Command Output (stderr):
--
==10217== Conditional jump or move depends on uninitialised value(s)
==10217==    at 0x10BE9A0: 
llvm::DwarfCompileUnit::addRange(llvm::RangeSpan) (DwarfCompileUnit.cpp:212)
==10217==    by 0x1078EBA: 
llvm::DwarfDebug::endFunction(llvm::MachineFunction const*) 
(DwarfDebug.cpp:1132)
==10217==    by 0x106221C: llvm::AsmPrinter::EmitFunctionBody() 
(AsmPrinter.cpp:982)
==10217==    by 0x87CA02: 
llvm::ARMAsmPrinter::runOnMachineFunction(llvm::MachineFunction&) 
(ARMAsmPrinter.cpp:165)
==10217==    by 0x1184F35: 
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) 
(MachineFunctionPass.cpp:62)
==10217==    by 0x13EBF7E: 
llvm::FPPassManager::runOnFunction(llvm::Function&) 
(LegacyPassManager.cpp:1513)
==10217==    by 0x13EC1D2: 
llvm::FPPassManager::runOnModule(llvm::Module&) (LegacyPassManager.cpp:1534)
==10217==    by 0x13EC6D5: runOnModule (LegacyPassManager.cpp:1590)
==10217==    by 0x13EC6D5: 
llvm::legacy::PassManagerImpl::run(llvm::Module&) 
(LegacyPassManager.cpp:1693)
==10217==    by 0x64914C: compileModule(char**, llvm::LLVMContext&) 
(llc.cpp:524)
==10217==    by 0x6467EA: main (llc.cpp:282)
==10217==

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