[LLVMbugs] [Bug 8174] New: Unreachable Block Elim sometimes changes code, but returns "false" in runOnMachineFunction

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8174

           Summary: Unreachable Block Elim sometimes changes code, but
                    returns "false" in runOnMachineFunction
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: braxton.mckee at gmail.com
                CC: llvmbugs at cs.uiuc.edu


Even if there are no dead blocks, it is possible for UnreachableBlockElim to
remove some Phi nodes.  It ought to set a flag and return "true" if it removes
any phi nodes.

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