[LLVMbugs] [Bug 8978] New: constmerge is order dependent

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8978

           Summary: constmerge is order dependent
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Interprocedural Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu


constmerge will optimize

%struct.foobar = type { i32 }
@bar.d =  constant %struct.foobar zeroinitializer, align 4
@foo.d = internal constant %struct.foobar zeroinitializer, align 4
define i32 @main() nounwind ssp {
entry:
  %call2 = tail call i32 @zed(%struct.foobar* @foo.d, %struct.foobar* @bar.d)
nounwind
  ret i32 0
}


but swapping the positions of bar.d and foo.d causes it to miss the
opportunity.

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