[LLVMbugs] [Bug 4540] New: Change in case statement value generates incorrect code ( crashes the runtime linker)

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4540

           Summary: Change in case statement value generates incorrect code
                    (crashes the runtime linker)
           Product: libraries
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: major
          Priority: P2
         Component: Backend: PowerPC
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: revcompgeek at gmail.com
                CC: llvmbugs at cs.uiuc.edu, revcompgeek at gmail.com


Created an attachment (id=3181)
 --> (http://llvm.org/bugs/attachment.cgi?id=3181)
Archive of the related files.

GDB reports that dyld, the dynamic runtime linker crashes when running an
executable generated from the switch_bad.ll file in the attachment. Line 109 is
the only thing that is changed between the good.ll file and the bad.ll file,
and the only change is in the value it is testing for. Some values for that
case statement work, others don't, and I do not recognize any correlation in
the values. Commenting out any one of the case statements also works.


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