[LLVMbugs] [Bug 1261] NEW: instcombine miscompilation

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1261

           Summary: instcombine miscompilation
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: wenwenti at hotmail.com


I found an error in instcombine pass. Please look at the b.ll file attached. At
line 956, the extension operation is sext. After instcombine, it has been
changed to zext which causes semantic errors.



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