[LLVMdev] Use of blockadress() crashes llc in some cases

[Sebastian Schlunke]

Hi!

In some cases the use of blockaddress() crashes llc. 

I've attached two test-cases, one that crashes and for reference a slightly modified one (just 2 lines are commented) that works. 

I compile the files with 
	# llvm-as test_crash.ll -o - | llc -f -o temp.s -

and get

0  llc             0x0000000000c6ab6f
1  llc             0x0000000000c6b38d
2  libpthread.so.0 0x00007feccd2270f0
3  llc             0x00000000009a270f llvm::DenseMap<llvm::AssertingVH<llvm::BasicBlock>, llvm::MMIAddrLabelMap::AddrLabelSymEntry, llvm::DenseMapInfo<llvm::AssertingVH<llvm::BasicBlock> >, llvm::DenseMapInfo<llvm::MMIAddrLabelMap::AddrLabelSymEntry> >::operator[](llvm::AssertingVH<llvm::BasicBlock> const&) + 31
4  llc             0x000000000099f5d0 llvm::MMIAddrLabelMap::UpdateForRAUWBlock(llvm::BasicBlock*, llvm::BasicBlock*) + 64
5  llc             0x0000000000c10c9a llvm::ValueHandleBase::ValueIsRAUWd(llvm::Value*, llvm::Value*) + 442
6  llc             0x0000000000c11115 llvm::Value::uncheckedReplaceAllUsesWith(llvm::Value*) + 261
7  llc             0x0000000000ac86da llvm::MergeBasicBlockIntoOnlyPred(llvm::BasicBlock*, llvm::Pass*) + 186
8  llc             0x0000000000a8780f
9  llc             0x0000000000a8830b
10 llc             0x0000000000a89cd6
11 llc             0x0000000000bfdf16 llvm::FPPassManager::runOnFunction(llvm::Function&) + 534
12 llc             0x0000000000bfe0f1 llvm::FunctionPassManagerImpl::run(llvm::Function&) + 129
13 llc             0x0000000000bfe31e llvm::FunctionPassManager::run(llvm::Function&) + 110
14 llc             0x000000000052d334 main + 3556
15 libc.so.6       0x00007feccc311a3d __libc_start_main + 253
16 llc             0x000000000052b039
Stack dump:
0.      Program arguments: llc -f -o temp.s - 
1.      Running pass 'Optimize for code generation' on function '@reduce_graph'
Segmentation fault

I'm using the svn-version, revision 98581.

Regards,
Sebastian
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