[LLVMbugs] [Bug 1131] NEW: SimplfyCfg deletes too much probably due to instcombine fault

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1131

           Summary: SimplfyCfg deletes too much probably due to instcombine
                    fault
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Scalar Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: asl at math.spbu.ru


Consider the attached bytecode.

./opt -instcombine -simplifycfg nsSubstring.bc

strips all code from %_ZN11nsSubstring7ReplaceEjjRK18nsAString_internal function
(the same for "EjjRK19" one). Without instcombine - everything is ok.

This breaks Mozilla builds.



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