[LLVMbugs] [Bug 2340] New: SimplifyCFG doesn' t proerly clean up trivially dead instructions

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2340

           Summary: SimplifyCFG doesn't proerly clean up trivially dead
                    instructions
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sharparrow1 at yahoo.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=1649)
 --> (http://llvm.org/bugs/attachment.cgi?id=1649)
Testcase

To reproduce: run "opt -simplifycfg" on the attached testcase. Code after
simplifycfg:

define i32 @x(i32 %x) {
entry:
        %call = call i32 (...)* @foo( )         ; <i32> [#uses=0]
        %cond = icmp eq i32 %x, 9               ; <i1> [#uses=0]
        %call9 = call i32 (...)* @bar( )                ; <i32> [#uses=0]
        ret i32 0
}

The icmp is unused; SimplifyCFG should have eliminated it when it eliminated
the branch that used it.


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