[LLVMbugs] [Bug 2876] New: simplifycfg won't simplify switch to identical blocks

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Thu Oct 9 22:36:28 PDT 2008


           Summary: simplifycfg won't simplify switch to identical blocks
           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: nicholas at mxc.ca
                CC: llvmbugs at cs.uiuc.edu

Given a branch where the two target blocks are identical ("ret i32 %b" in
both), simplifycfg will simplify them away. But not so for a switch statement:

define i32 @f(i32 %a, i32 %b) nounwind readnone {
        switch i32 %a, label %bb3 [
                i32 4, label %bb
                i32 6, label %bb

bb:             ; preds = %entry, %entry
        ret i32 %b

bb3:            ; preds = %entry
        ret i32 %b

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