[LLVMbugs] [Bug 3571] New: [2.5] Qt build failed

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3571

           Summary: [2.5] Qt build failed
           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: llvmbugs at cs.uiuc.edu


Created an attachment (id=2551)
 --> (http://llvm.org/bugs/attachment.cgi?id=2551)
Testcase

Currently Qt build is failed on 2.5 at least on mingw, which is definitely a
serious regression.

The assertion in codegen is triggered. Same can be seen on TOT:

$ ./llc bugpoint-reduced-simplified.bc 
llc: /home/asl/proj/llvm/src/lib/CodeGen/LiveVariables.cpp:129: void
llvm::LiveVariables::HandleVirtRegUse(unsigned int, llvm::MachineBasicBlock*,
llvm::MachineInstr*): Assertion `MRI->getVRegDef(reg) && "Register use before
def!"' failed.


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