[LLVMbugs] [Bug 3138] New: jump threading horribly broken

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3138

           Summary: jump threading horribly broken
           Product: new-bugs
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: baldrick at free.fr
                CC: llvmbugs at cs.uiuc.edu


Compiling this:

define i32 @jt() {
entry:
        br i1 true, label %bb3, label %bb

bb:             ; preds = %entry
        unreachable

bb3:            ; preds = %entry
        ret i32 0
}

with opt -jump-threading gives:

define i32 @jt() {
bb:
        unreachable

bb3:            ; No predecessors!
        ret i32 0
}


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