[LLVMbugs] [Bug 5495] New: Assert failure "Interval does not exist for register" during llvm-gcc build

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=5495

           Summary: Assert failure "Interval does not exist for register"
                    during llvm-gcc build
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: baldrick at free.fr
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=3818)
 --> (http://llvm.org/bugs/attachment.cgi?id=3818)
testcase .ll

Crash while building libstdc++-v3/src/istream.cc.  Bugpoint reduced testcase
attached:

$ llc coalesce.bc
llc: llvm/include/llvm/CodeGen/LiveIntervalAnalysis.h:90: llvm::LiveInterval&
llvm::LiveIntervals::getInterval(unsigned int): Assertion `I != r2iMap_.end()
&& "Interval does not exist for register"' failed.
...
llvm::SimpleRegisterCoalescing::JoinCopy(llvm::CopyRec&, bool&) + 5001
8  llc       0x00000000012d89ef
llvm::SimpleRegisterCoalescing::CopyCoalesceInMBB(llvm::MachineBasicBlock*,
std::vector<llvm::CopyRec, std::allocator<llvm::CopyRec> >&) + 1257
9  llc       0x00000000012d8cd0 llvm::SimpleRegisterCoalescing::joinIntervals()
+ 624
10 llc       0x00000000012da005
llvm::SimpleRegisterCoalescing::runOnMachineFunction(llvm::MachineFunction&) +
827


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