[LLVMbugs] [Bug 2509] New: Jump threading produces funky output

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2509

           Summary: Jump threading produces funky output
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: resistor at mac.com
                CC: llvmbugs at cs.uiuc.edu


In the case attached, jump threading produces output with unreachable blocks
that still branch to reachable blocks.  It would be really nice if it didn't do
this.  This situation causes GVN to miss some optimizations.


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