Compiler crashes when using the same name for two different arguments in two different scopes

[ghost]

I'm on the latest HLC compiler from the branch hsail-stable-3.7. I compiled with -O2.

The following kernel fails to compile.

__attribute__((noinline)) static uint Op(uint in)
{
    return 2*in;
}

__kernel void Bug1(uint in, __global uint *out)
{
    *out = Op(in);
}

The HLC compiler crashes with the following error message:

ERROR:  The following command failed with return code 134.
        ./llc -O2 -march=hsail64 -filetype=asm -o /tmp/cloc13948/temp.hsail /tmp/cloc13948/temp.opt.bc

llc: /home/dgeier/Documents/swarm64/code/hsa/HLC-HSAIL-Development-LLVM/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:3346: llvm::SDValue llvm::SelectionDAG::getNode(unsigned int, llvm::SDLoc, llvm::EVT, llvm::SDValue, llvm::SDValue, const llvm::SDNodeFlags*): Assertion `N1.getValueType() == N2.getValueType() && N1.getValueType() == VT && "Binary operator types must match!"' failed.
0  llc             0x00000000022348d2 llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 59
1  llc             0x0000000002234c26
2  llc             0x00000000022336b1
3  libpthread.so.0 0x00007fe6272b1d10
4  libc.so.6       0x00007fe626451267 gsignal + 55
5  libc.so.6       0x00007fe626452eca abort + 362
6  libc.so.6       0x00007fe62644a03d
7  libc.so.6       0x00007fe62644a0f2
8  llc             0x0000000002091357 llvm::SelectionDAG::getNode(unsigned int, llvm::SDLoc, llvm::EVT, llvm::SDValue, llvm::SDValue, llvm::SDNodeFlags const*) + 2285
9  llc             0x00000000017e2ba1 llvm::HSAILTargetLowering::getArgStore(llvm::SelectionDAG&, llvm::SDLoc, llvm::EVT, llvm::Type*, unsigned int, llvm::SDValue, llvm::SDValue, llvm::SDValue, unsigned int, llvm::SDValue, llvm::AAMDNodes const&, unsigned long) const + 741
10 llc             0x00000000017e360d llvm::HSAILTargetLowering::LowerArgument(llvm::SDValue, llvm::SDValue, bool, llvm::SmallVectorImpl<llvm::ISD::InputArg> const*, llvm::SmallVectorImpl<llvm::ISD::OutputArg> const*, llvm::SDLoc, llvm::SelectionDAG&, llvm::SmallVectorImpl<llvm::SDValue>*, unsigned int&, llvm::Type*, unsigned int, char const*, llvm::SDValue, llvm::SmallVectorImpl<llvm::SDValue> const*, bool, llvm::AAMDNodes const&, unsigned long) const + 2131
11 llc             0x00000000017e4ca5 llvm::HSAILTargetLowering::LowerCall(llvm::TargetLowering::CallLoweringInfo&, llvm::SmallVectorImpl<llvm::SDValue>&) const + 4339
12 llc             0x00000000020e5da8 llvm::TargetLowering::LowerCallTo(llvm::TargetLowering::CallLoweringInfo&) const + 4450
13 llc             0x00000000020dc4e2 llvm::SelectionDAGBuilder::lowerInvokable(llvm::TargetLowering::CallLoweringInfo&, llvm::MachineBasicBlock*) + 444
14 llc             0x00000000020dca61 llvm::SelectionDAGBuilder::LowerCallTo(llvm::ImmutableCallSite, llvm::SDValue, bool, llvm::MachineBasicBlock*) + 951
15 llc             0x00000000020df148 llvm::SelectionDAGBuilder::visitCall(llvm::CallInst const&) + 2294
16 llc             0x00000000020be4d6 llvm::SelectionDAGBuilder::visit(unsigned int, llvm::User const&) + 1256
17 llc             0x00000000020bdf49 llvm::SelectionDAGBuilder::visit(llvm::Instruction const&) + 155
18 llc             0x000000000210c037 llvm::SelectionDAGISel::SelectBasicBlock(llvm::ilist_iterator<llvm::Instruction const>, llvm::ilist_iterator<llvm::Instruction const>, bool&) + 83
19 llc             0x000000000210f3d0 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) + 2866
20 llc             0x000000000210b261 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) + 1049
21 llc             0x00000000017d2fd9
22 llc             0x0000000001a8061d llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 95
23 llc             0x0000000001e0cc9d llvm::FPPassManager::runOnFunction(llvm::Function&) + 305
24 llc             0x0000000001e0ce3c llvm::FPPassManager::runOnModule(llvm::Module&) + 112
25 llc             0x0000000001e0d1b4
26 llc             0x0000000001e0d894 llvm::legacy::PassManagerImpl::run(llvm::Module&) + 252
27 llc             0x0000000001e0dacd llvm::legacy::PassManager::run(llvm::Module&) + 39
28 llc             0x0000000000cb0376
29 llc             0x0000000000caf30a main + 257
30 libc.so.6       0x00007fe62643ca40 __libc_start_main + 240
31 llc             0x0000000000cae049 _start + 41
Stack dump:
0.  Program arguments: ./llc -O2 -march=hsail64 -filetype=asm -o /tmp/cloc13948/temp.hsail /tmp/cloc13948/temp.opt.bc 
1.  Running pass 'Function Pass Manager' on module '/tmp/cloc13948/temp.opt.bc'.
2.  Running pass 'HSAIL DAG->DAG Instruction Selection' on function '@__OpenCL_Bug1_kernel'
/opt/amd/bin/cloc.sh: line 333: 13966 Aborted                 (core dumped) $HSA_LLVM_PATH/$CMD_LLC -o $TMPDIR/$FNAME.hsail $TMPDIR/$FNAME.opt.bc

Weirdly, after changing the name of the in argument of Op() to in2, the error disappears. The following kernel compilers successfully.

__attribute__((noinline)) static uint Op(uint in2)
{
    return 2*in2;
}

__kernel void Bug1(uint in, __global uint *out)
{
    *out = Op(in);
}