[LLVMbugs] [Bug 4034] New: Colescer crash

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4034

           Summary: Colescer crash
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: asl at math.spbu.ru
                CC: evan.cheng at apple.com, gohman at apple.com,
                    llvmbugs at cs.uiuc.edu


Created an attachment (id=2854)
 --> (http://llvm.org/bugs/attachment.cgi?id=2854)
Bitcode

Consider the attached bitcode. Running llc yields:

$ ./llc bugpoint-reduced-function.bc
llc: /home/asl/proj/llvm/src/lib/CodeGen/SimpleRegisterCoalescing.cpp:115: bool
llvm::SimpleRegisterCoalescing::AdjustCopiesBackFrom(llvm::LiveInterval&,
llvm::LiveInterval&, llvm::MachineInstr*): Assertion `BValNo->def == CopyIdx &&
"Copy doesn't define the value?"' failed.
0   llc             0x0000000000e2860f
1   llc             0x0000000000e28c8a
2   libpthread.so.0 0x00007f3100592390
3   libc.so.6       0x00007f30ff8d45c5 gsignal + 53
4   libc.so.6       0x00007f30ff8d5a70 abort + 272
5   libc.so.6       0x00007f30ff8cda3f __assert_fail + 239
6   llc             0x0000000000c1f1ec
llvm::SimpleRegisterCoalescing::AdjustCopiesBackFrom(llvm::LiveInterval&,
llvm::LiveInterval&, llvm::MachineInstr*) + 972
7   llc             0x0000000000c2527f
llvm::SimpleRegisterCoalescing::JoinCopy(llvm::CopyRec&, bool&) + 11311
8   llc             0x0000000000c26b54
llvm::SimpleRegisterCoalescing::joinIntervals() + 724
9   llc             0x0000000000c287dd
llvm::SimpleRegisterCoalescing::runOnMachineFunction(llvm::MachineFunction&) +
5389
10  llc             0x0000000000bb3b45
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 53
11  llc             0x0000000000db9235
llvm::FPPassManager::runOnFunction(llvm::Function&) + 565
12  llc             0x0000000000db9658
llvm::FunctionPassManagerImpl::run(llvm::Function&) + 136
13  llc             0x0000000000db9846
llvm::FunctionPassManager::run(llvm::Function&) + 70
14  llc             0x0000000000502363 main + 2627
15  libc.so.6       0x00007f30ff8c15e4 __libc_start_main + 244
16  llc             0x00000000004ffa29
Stack dump:
0.      Program arguments: ./llc bugpoint-reduced-function.bc 
1.      Running pass 'Simple Register Coalescing' on function
'@getAffNeighbour'


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